5th International solar fuels conference Poster presentations
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5th International solar fuels conference 1-5 September 2025, Newcastle, United Kingdom
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Poster presentations
P01
Supramolecular substrate preorganization at tailored oligonuclear transition metal complexes for improved artificial photosynthesis Muhammad Abubakar Sidiq Institute of Inorganic Chemistry AC-1, Ulm University, Germany Halide-driven quenching of iron NHC complex: unlocking new pathways in photochemical dynamics Katerina Achilleos UCLouvain, Belgium Sustainable green hydrogen production and value-added products through earth-abundant semiconductor-sensitized TiO ₂ via PEC water splitting Oshnik Maurya Institute of Chemical Technology, Mumbai, India Insights into charge dynamics in Y6-based heterojunction organic nanoparticles for hydrogen evolution Keren Ai Imperial College London, UK Engineering Cu modified Sn-based catalysts for enhanced electrochemical carbon dioxide reduction Saira Ajmal Uppsala University, Sweden Efficient photo-assisted electrocatalytic oxygen evolution using engineered CeO 2 Zahra Albu University College London, UK Investigating the effect of graphene oxide on the photocatalytic efficiency of Bi-BiOBr and P25 TiO 2 composites for NOx removal Paransa Alimard Imperial College London, UK
P02
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Perovskite photoelectrocatalysis for solar driven chemical synthesis Virgil Andrei Yusuf Hamied Department of Chemistry, University of Cambridge, UK
P09
EASI-Fuel solar to methane integrated device: a versatile tool for solar to X process assessment Vincent Artero Université Grenoble Alpes, CNRS, CEA, France
P10
Re-evaluating the stability of nanoscale aluminium oxide barrier layers in electrochemical conditions Andrew Bagnall Uppsala University, Sweden
P11
Efficient CO 2 electroreduction to CO using nanostructured Ag-based catalysts Ola Bajouk French Alternative Energies and Atomic Energy Commission (CEA), Grenoble, France
P12
Engineering Co 3 O 4 electrodes for efficient water oxidation Suresh Chandra Baral Heriot-Watt University, UK
P13
High-throughput investigation of Cu-Ti and Cu-Sn catalysts for fuel production from CO 2 Antonio Barile Università di Bologna, Italy
P14
Upconversion photocatalyst for H 2 production by water splitting Janyce Beaurain Université Claude Bernard Lyon 1, France
P15
Organic-inorganic photosynthetic interfaces built on intertwined WO 3 nanosheets for enhanced HBr/H 2 O photoanodic oxidations Elisabetta Benazzi Padova University, Italy Multiphysics model for design optimization of a monolithic photoelectrochemical cell device Elise Bérut Univ. Grenoble Alpes, France
P16
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Photocatalytic hydrogen production coupled to glucose oxidation using a conjugated polyelectrolyte photocatalyst Rhys Bourhill University of Strathclyde, UK Quinoxaline-based and pyrazine-based organic dyes as anodic sensitizers in photoelectrochemical cells Massimo Calamante CNR-ICCOM, Italy Photoelectrocatalytic C-C and C-N bond formation using a lead-free metal halide double perovskite photoanode Wei Xin Chan Nanyang Technological University, Singapore Scalable and acid-resistance W-BiVO 4 photoanodes for photoelectrochemical glycerol valorization to value-added chemicals Deepak Kumar Chauhan DIFFER, Netherlands Effects of ionomer-induced microenvironments in electrochemical nitrate reduction to ammonia Hojoong Choi Helmholtz-Zentrum Hereon, Germany Investigation of CO 2 capture and photoreduction mechanisms in IEF-11 based metal organic frameworks Vanessa Hui Yin Chou Imperial College London, UK
P18
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Perovskite photoanode for solar fuel production Do Hyung Chun University of Cambridge, UK
P24
Charge carrier collection at buried Cu(In,Ga)S 2 interfaces with opaque front contact for photoelectrochemical hydrogen generation Valentina Corsetti University of Bristol, UK
P25
Development and on sun field testing of photoelectrochemical reactors for scaling-up solar hydrogen production George Creasey Imperial College London, UK Towards stable solar hydrogen generation by tandem organic bulk heterojunction photoanodes Matyas Daboczi HUN-REN Centre for Energy Research, Imperial College London, Hungary Efficient charge separation on organic D/A heterojunction photocatalysts for hydrogen evolution Junyin Dong The Hong Kong University of Science and Technology (Guangzhou), China Engineering tailored photocatalysts for sustainable aviation fuel production: Advanced surface analysis to enable rationale design Lee Durndell University of Plymouth, UK Functionalized liposomes for light-driven H 2 evolution and NADH regeneration Hani M. Elbeheiry Institute for Inorganic and Analytical Chemistry, University of Jena, Germany Unravelling charge carrier dynamics in nanostructured photoelectrodes for water splitting via intensity-modulated photocurrent spectroscopy Juan Carlos Exposito Galvez Universidad Pablo de Olavide, Spain
P26
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P31
Reliable production of isopropyl alcohol from air carbon dioxide Andrea Facchin University of Bologna, Italy
P32
Reaction kinetics in cobalt-based electrocatalyst for water oxidation Shima Farhoosh Free University Berlin, Germany
P33
Reactive sputter deposition of Cu-based photocathode thin films Katarina Sophie Flashar Technical University Munich, Walter Schottky Institute, Germany
P34
Beyond superaerophobicity: gradient-porous hydrogels synchronize gas detachment and charge flow for high-current HER Makafui Folikumah Helmholtz-Zentrum Hereon, Germany Rational design of Zn:Sn overlayers to enhance the water splitting kinetics of hematite photoanodes Alejandro Galán-González Instituto de Carboquímica (ICB-CSIC), Spain Re(I)-based imidazole-pyridyl complexes as photocatalysts for CO 2 reduction Pablo José Gonçalves Universidade Federal de Goias, Brazil Molecular engineering of covalent organic frameworks for hydrogen evolution Albert Granados Universitat Autònoma de Barcelona, Spain Photocatalyst sheet performance under elevated UV intensities and temperatures Talib Rahman University of Adelaide, Australia Elucidating the CO2RR mechanism of M(bpy)(CO) 3 X by TRIR (M = Mn, Re) Leif Hammarström Uppsala University, Sweden Transient absorption studies of TiO 2 and TiO 2 –reduced graphene oxide composites Iona Hill Edinburgh Instruments, UK Observing dynamic electric field changes in bipolar membranes for water electrolysis Nathaniel Hill University of Liverpool, UK
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Influence of temperature and illumination intensity on the stability of LaTiO 2 N based photoanodes Julian Hörndl University of Salzburg, Austria From sunlight to fuels: Hybrid PEC–PBEC systems for methanol and methane generation in ALGAESOL Carlos Hurtado LEITAT Technological Center, Spain
P43
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Electroreduction of carbon dioxide without metal or organic cations Hansaem Jang University of Liverpool, UK
P45
Engineering halide perovskite-based buried junction photocathodes for hydrogen evolution Vishal Jose IMEC, Belgium Efficient and selective photocatalytic conversion of low-concentration CO 2 to CO using Mn catalysts Kei Kamogawa Hiroshima University, Japan Enhancing water oxidation performance of carbon nitride photoanode by regulating film growth and self-engineered Z-scheme heterojunctions Abraham Solomon Kasa Imec/Hasselt University, Belgium Self-induced convection as a built-in mass transport accelerator in photoelectrochemical glycerol valorization Heejung Kong Helmholtz-Zentrum Berlin, Germany Graphitic carbon nitride quantum dots and metal porphyrins assemble for CO 2 reduction Hanna Larsson Chalmers University of Technology, Sweden
P46
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Interfacial carrier kinetics in Cu 2 O photocathodes for bias-free solar water splitting Keming Li Imperial College London, UK Unlocking ultrafast hot hole transport in transition metal oxides governed by the nature of optical transitions Keming Li Imperial College London, UK Integrated capture and electroreduction of low-concentration CO 2 to CO using geopolymer|graphene-cobalt phthalocyanine composite Chia-Yu Lin Department of Chemical Engineering, National Cheng Kung University, Chinese Taipei A combination of combinatorial AACVD and machine learning for highthroughput investigation of photoelectrochemical performance of Modoped BiVO 4 Zhipeng Lin Imperial College London, UK Unlocking new ionic carbon nitrides from ionic cocrystals for solardriven fuel synthesis Anna Lo Presti Max Planck Institute of colloids and interfaces, Germany
P51
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Enzymatic flow electrolyser for the comproportionation of CO 2 and organic waste to formate Beverly Qian Ling Low University of Cambridge, UK
P56
Development of decoupled photoelectrochemical hydrogen production reactor with a single photoanode exceeding 500 cm 2 Xinxin Lu Petrochina Shenzhen New Energy Research Institute Co., Ltd, China
P57
A Ni based OER photoanode for CO 2 RR photoelectrochemical stacks Aureliano Macili Autonomous University of Barcelona, Spain
P58
SOlar Energy to power CO 2 REduction towards C 2 chemicals for energy storage: the SOREC 2 project Alberto Magliocco University of Ferrara, Italy
P59
Ammonia production via electrochemical dinitrogen reduction: addressing parameters control in the metal-mediated systems Anna Mangini Politecnico di Torino, Italy Comparison of iridium sensitizers employed in the photoelectrochemical generation of added-value organics Andrea Mantovani University of Ferrara, Italy
P60
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Simulation of photoinduced processes in photoelectrochemical cells for solar fuel production Jan Paul Menzel Yale University, USA
P62
Self-sustained biophotovoltaic system for hydrogen production Alicia A. Mier-Jimenez Helmholtz Centre for Environmental Research (UFZ), Germany
P63
High Surface Area 3D Graphene as a Versatile Template Jaimon Chonedan Johnson Politecnico di Torino, Torino, Italy
P64
Compartmentalised carbonylation cascade initiated by photocatalytic CO2 reduction Sampurna Mitra University of Cambridge, UK Photocatalytic-assisted production of ammonia using Fe 3 O 4 /g-C 3 N 4 hybrid materials José Monteiro LSRE-LCM, University of Porto - Faculty of Engineering, Portugal
P65
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Stability and O 2 sensitivity of CO 2 electrolysers Caitlin Muir University of Liverpool, UK
P67
Advancing OER catalysis with transition metals-Doped LDH: a scalable 3D nanostructured catalyst for sustainable and high-performance energy technologies Rajini Murugesan SRM Institute of Science and Technology, India
P68
Paired solar driven bias-free nitrobenzene and benzylalcohol photoelectrolysis with condensation cascade for imine synthesis
Afreen Hooriya Naceruddin University of Cambridge, UK
P69
Electrografting of organic layer on Cu-based electrode surface for improving C-C coupling during CO 2 electroreduction Duy Thai Nguyen College de France, France Engineering catalyst microenvironments with organic modifiers to enhance selectivity in CO 2 electroreduction on Cu and Ag surfaces Phannaro Nhem Hemholtz-Zentrum Hereon, Germany
P70
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Investigating photovoltage in Fe 2 O 3 photoanodes Louise Oldham Imperial College London, UK
P72
Light intensity–directed selective CO 2 photoreduction using iron(0)– zirconium dioxide photocatalyst Tomoki Oyumi Chiba University, Japan Unveiling the role of oxygen vacancies in the photoactivity and charge dynamics of Bi 2 WO 6 -based photoanodes for glycerol photoreforming Antonio Otavio Patrocinio Federal University of Uberlandia, Brazil Binder-free nickel borate/nickel hydroxide bifunctional catalyst for coupled nitrate reduction and glycerol oxidation towards sustainable ammonia production Chanon Pornrungroj Chulalongkorn University, Thailand
P73
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Decoupled solar energy conversion and storage in a two-dimensional covalent organic framework photoanode Bibhuti Bhusan Rath Max Planck Institute for Solid State Research, Germany
P76
Floatable composites for solar chemistry at the liquid-liquid interface Andrea Rogolino University of Cambridge, UK
P77
Realization of a photoelectrochemical cascade for the generation of methanol Grace Rome Colorado School of Mines & National Renewable Energy Laboratory, USA Catalyst integration and light-intensity studies on surface composition effects in ZnTe photocathodes for CO 2 reduction Christina Roukounaki Helmholtz Zentrum Hereon, Germany Gluten stabilised gold nanocluster decorated titanium dioxide for photocatalytic hydrogen generation and dye degradation Meegle S Mathew Mar Athanasius College Kothamangalam, India Probing buffer-driven failure modes in AEM zero-gap CO 2 electrolysis under accelerated stress conditions Aloka Kumar Sahu Helmholtz-Zentrum Hereon, Germany CO 2 /CO-to-C3+ products electrochemical conversion for dinuclear cuprous molecular catalysts Naonari Sakamoto Toyota Central R&D Labs Inc., Japan More than just screening: combinatorial insights into titanium doping in hematite photoanodes Marco Salvi University of Bologna, Italy
P78
P79
P80
P81
P82
P83
Iron based photosensitizers anchored on metal oxide thin films for a greener future Lakshmi Narayan Satheesh Babu UCLouvain, Belgium
P84
Extracting local carrier dynamics from KPFM surface potential maps Mauricio Schieda Helmholtz-Zentrum Hereon, Germany
P85
A study of the chiral-induced spin selectivity effect on glycerol oxidation with nickel nanoparticles Marta Sendra Garcia Universitat Autònoma de Barcelona, Spain Guided re-design of 3D porous electrodes for biophotoelectrochemical systems: a simulation-informed approach Linying Shang University of Cambridge, UK
P86
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Solar-driven plastic waste to valuable chemicals Zhongqing Shen Newcastle University, UK
P88
In pursuit of sustainable and stable materials for photoelectrochemical fuel production Sudhanshu Shukla Interuniversity Microelectronics Centre (IMEC), Belgium
P89
Towards the scale-up of TiO 2 -based photoanodes for water splitting Beatriz Silva Gaspar LCBM, Grenoble, France
P90
Self-standing bipolar membranes for water electrolysis Bhavin Siritanaratkul University of Liverpool, UK
P91
Towards pairing solar chemical production with central metabolism of S. oneidensis MR-1 Alexander Sutton-Cook University of East Anglia (UEA), UK
P92
Co-adsorption effect of Ir(III) complexes photosensitizers on CO 2 reduction photocatalysis of Ru(II)-Re(I) and polymeric carbon nitride Toshiya Tanaka Institute of Science Tokyo, Japan Lab-scale flow photoreactor implementation for direct CO 2 and H 2 O conversion into solar fuels Mikel Tellechea Leitat Technological Center, Spain A sustainable catalytic system for the simultaneous CO 2 reduction and alcohol oxidation driven by light Madasamy Thangamuthu University of Nottingham, UK Unlocking new ionic carbon nitrides from ionic cocrystals for solar- driven fuel synthesis Anna Lo Presti Max Planck Institute of colloids and interfaces, Germany Enzymatic flow electrolyser for the comproportionation of CO2 and organic waste to formate Beverly Low University of Cambridge, UK
P93
P94
P95
P96
P97
Design strategies of optimal catalysts for water splitting Habib Ullah University of Exeter, UK
P98
Development of Ta 3 N 5 photocatalysts with nanoplate structure and high efficiency for H 2 generation Junie Jhon Vequizo Institute of Aqua Regeneration, Shinshu University, Japan
P99
Tailoring WO 3 thin film properties via synthesis parameter control Frederike von der Haar University of Bayreuth, Germany
P100
Accelerated discovery of plasmonic photocatalysts for overall water splitting via Bayesian optimization Hong Wang University of Liverpool, UK Laser-driven solid-state route to ultrasmall nanocatalysts Huize Wang Helmholtz-Institut Erlangen-Nürnberg für Erneuerbare Energien (HIERN), Germany
P101
P102
Light storage in transition metal oxides Yang Wang Max Planck Institute for Solid State Research, Germany
P103
Accelerated discovery and characterization of nanoscale-covalent organic frameworks for photocatalytic water splitting Ziheng Xiao The University of Liverpool, UK Direct photocatalytic oxidation of methane to formic acid with high selectivity via a concerted proton–electron transfer process Siyuan Yang University of Science and Technology of China, China
P104
P105
Photoelectrochemical stability enhancement of (311)-oriented indium sulfide thin films via In-cystine complex formation under hydrothermal
synthesis Xiuru Yang University of Exeter, UK
P106
Designing organic semiconductor-BiVO 4 tandem devices for H 2 O and CO 2 splitting Celine Wing See Yeung University of Cambridge, UK Mechanistic investigations of a hydrogen-evolving cobalt diiminedioxime complex in an oxygen environment: secondary coordination sphere and Bro̷nsted acid Tsai Yu-Syuan National Sun Yat-sen University, Chinese Taipei
P107
P108
Electrochemical CO 2 reduction to multicarbon products with CuAg catalysts Eileen Yu University of Southampton, UK Temperature dependence of photoelectrochemical water oxidation and back electron-hole recombination on hematite photoanodes Shijie Yu Imperial College London, UK Scheduling optimization of wind–solar powered produced-water electrolysis for sustainable hydrogen blending into natural gas Chen Zhang PetroChina Shenzhen New Energy Research Institute Co. Ltd, China Sustainable aviation fuels from CO ₂ by cyanobacteria and photochemistry utilizing visible light for triplet-induced dimerization of isoprene Martin Axelsson Uppsala University, Sweden Acidic CO2 electroreduction into carbon products via surface modification of CuNPs catalysts functionalized with different crown ethers Hai Nam Ha Collège de France, France Development of biohybrid nanoreactor systems for solar-driven fuel production Imogen Bishara-Robertson Leiden University, Netherlands Light-driven CO2 reduction with a heptacoordinated iron(ii) polypyridine complex Federico Droghetti University of Ferrara, Italy O2-tolerant electro- and photocatalytic CO2-to-CO conversion by carbon monoxide dehydrogenases operating in deep eutectic solvents Leonard Olivotto DCM/Université grenoble Alpes, France
P109
P110
P111
P112
P113
P114
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Ni-based materials as electrocatalysts for glycerol and urea oxidation Maria Garrido Universitat Autònoma de Barcelona, Spain
P117
Photoreforming of solid waste on 1 m2 scale under real-world conditions using single-source precursor-derived co-catalyst films
Ariffin Bin Mohamad Annuar University of Cambridge, UK
P118
Development of fluorinated COFs for divergent solar fuels applications Albert Gallego Gamo Universitat Autónoma de Barcelona, Spain
P119
MOFs on GDEs for electrochemical CO2 reduction Francesca Greenwell Uppsala University, Sweden Limiting regimes of MOF modified semiconductor Amol Kumar Uppsala University, Sweden
P120
P121
Stabilising benzoquinone electron mediators with redox partners to by- pass reactive intermediates Shella Willyam University of Cambridge, UK
P122
Engineering advanced BiVO4 photoanodes for efficient photoelectrochemical water and ethylene glycol oxidation Htoo Thiri Htet Hasselt University/IMEC, Belgium
P123
Metal Sulfide Nanomaterials for Photocatalytic Water Splitting: Growth Control in Water/Ionic Liquids and Early-Stage Strategies Against
Photocorrosion Tannith-Jade Cole King's College London, UK
P124
Computational Engineering of Metal Organic Frameworks for solar fuel production Davide Tiana University College Cork, Ireland
P125
High-throughput discovery of non-noble materials for HER catalysis Wanyi Zheng University of Liverpool, UK Photoelectrochemical biomass valorisation using an integrated PV-PEC approach Irene Carrai Alma Mater Studiorum University of Bologna, Italy Interface engineering of cerium dioxide enables CO2 photoreduction to green methanol Subhajit Chakraborty Jawaharlal Nehru Centre for Advanced Scientific Research, India Rethinking chalcopyrite solar cells architecture for solar fuel production Leo Choubrac Institut des Matériaux de Nantes, CNRS, France From sunlight to fuels: Hybrid PEC–PBEC systems for methanol and methane generation in ALGAESOL Ainhoa Cots LEITAT Technological Center, Spain Carbon dioxide electrolysis for defossilisation of plastic production Charles Creissen Keele University, UK Plasmonic Antenna–Reactor Constructs for Production of Solar Fuels and Chemicals Ankit Dhankhar Indian Institute of Science Education and Research Pune, India Electrochemical wiring of cyanobacteria to anodes using polymers towards biohybrid devices for solar-chemical production Rachel Egan University of Cambridge, UK Device design and in-situ characterisation for efficient solar-driven synthesis of valuable chemicals Chen Han University of Cambridge, UK
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Unraveling the effect of Fe-incorporation on high-performance water- splitting MIS photoanodes Kanokwan Klahan Vidyasirimedhi Institute of Science and Technology, Thailand Solar-driven organic waste valorisation for hydrogen and value-added chemicals co-production on earth-abundant materials Yi-Hsuan Lai Department of Materials Science and Engineering, National Cheng Kung University, Chinese Taipei
P135
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Material selection for optical optimization of up-scaled photoelectrochemical reactors Estelle Le Baron CEA, France
P137
Influence of poly(diketopyrrolopyrrole) chain length and chemical structure on photocatalytic hydrogen evolution in composites with TiO2 Teresa Mauerer University of Bayreuth, Germany Electrografting of organic layer on Cu-based electrode surface for improving C-C coupling during CO2 electroreduction Duy Thai Nguyen College de France, France Functionalised Graphite Supports Enhance Nanoparticle Catalysed Water Electrolysis Reece Paterson Newcastle University, UK Hybrid photoanodes for water oxidation based on high-valent metal complexes Sergii Shylin Uppsala University, Sweden Enhancing water splitting photoanodes with plasmonic metal nanoparticles Andreas Tam Imperial College London, UK
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Nanoparticle-enhanced Ce-UiO-66 & derivatives for photocatalytic water splitting Minh Chi To University of Stavanger, Norway Catalyst integration and light-intensity studies on surface composition effects in ZnTe photocathodes for CO ₂ reduction Francesca Toma Institute of Functional Materials for Sustainability, Germany
P143
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Insights into the electrochemical properties of benzothiadiazole covalently bound to different pyridine substituents
Carlos Enrique Torres Méndez Uppsala University, Sweden
P145
Semi-artificial photosynthesis for solar fuel production Yongpeng Liu University of Cambridge, UK
Supramolecular substrate preorganization at tailored oligonuclear transition metal complexes for improved artificial photosynthesis Muhammad Abubakar-Sidiq, Sven Rau Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany The limitations in harnessing and converting solar energy through photosynthesis create boundaries in the photocatalytic process. For artificial photosynthesis, ruthenium-centered photosensitizer are frequently studied. Ruthenium (II) polypyridyl sensitizers usually absorb visible light with molar absorption coefficients surpassing 10000 M −1 cm −1 in the visible region and demonstrate relatively long-lived excited states. 1 To overcome efficiency limitations due to electron donor diffusion towards the photocatalyst, pre-arrangement of these donors is desirable. Initial experiments involved [(Rbpy) 2 Ru(tpphz)PtI 2 ] 2+ alongside various pre-arranged electron donor materials to enhance hydrogen production. By altering solvent combinations and temperature settings, a notably higher turnover number (TON) was achieved. Maximizing the ratio of the desired forward electron transfer processes to unintended back electron transfer is crucial for an efficient photocatalytic process. Introducing competitive binders on the tpphz surface, as illustrated in Figure 1, presents an additional molecular solution to enhance cage escape yields (CEYs) and thereby improve photocatalysis. 2 Figure 1: Acceleration of NADH •+ loss from tpphz binding site for competitive binder (shown in red)-improved CEY using [(Rbpy) 2 Ru(tpphz)PtI 2 ] 2+ and NADH References 1. Cerfontaine, Simon; Wehlin, Sara A. M.; Elias, Benjamin; Troian-Gautier, Ludovic. Photostable Polynuclear Ruthenium (II) Photosensitizers Competent for Dehalogenation Photoredox Catalysis at 590 nm . In: Journal of the American Chemical Society , Vol. 142, no.12, p. 5549-5555 (2020). doi:10.1021/jacs.0c01503. 2. Wintergerst, K. Witas, D. Nauroozi, M. A. Schmid, E. Dikmen, S. Tschierlei, S. Rau, Zeitschrift fur Anorganische und Allgemeine Chemie 2020, 646 , 842–848.
P01
© The Author(s), 2025
Halide-driven quenching of iron NHC complex: unlocking new pathways in photochemical dynamics Katerina Achilleos, Ludovic Troian Gautier UCLouvain, Belgium Iron-based N-heterocyclic carbene (NHC) complexes have emerged as versatile and efficient photosensitizers, due to their favorable redox properties and tunable electronic structure offering important advantages in light- driven reactions, such as energy transfer and electron transfer mechanisms. [1] Recently, some studies have revealed that halides (Cl – , Br – , I – ) can effectively quench the excited states of these complexes, providing that sufficient concentrations of halides are used. Indeed, one of the biggest challenges in using the Iron-based NHC photosensitizers for bimolecular excited-state electron transfer is their extremely short excited-state lifetimes. [2] The interaction between halides and Iron NHC complexes not only influences the efficiency of energy and electron transfer processes but also initiates new pathways for controlling photochemical reactions. [2] In here, we report an innovative approach that leverages electrostatic interactions to pre-associate iron photosensitizers and halides, thus eliminating the need for diffusion. To do so, we synthesized a novel Iron based-NHC complex functionalized with N-methyl-pyridinium groups, thereby leading to an overall tri-cationic photosensitizer. The novel photosensitizers were fully characterized, including molar absorption coefficient (ε) as well as steady-state and time-resolved luminescence across a wide range of solvents. Excited-state quenching experiments with halides were conducted to determine the quenching rate constants (k q ) through steady-state and time-resolved luminescence measurements, further revealing the impact of halide-induced quenching on the behavior of these complexes. Finally, proof of excited-state electron transfer was obtained using transient absorption spectroscopy, with time resolution that ranged from femtoseconds to microseconds ; Overall, the ability to control and modulate excited-state behavior through halide quenching could have meaningful applications in areas such as catalysis, energy conversion, and the development of bio-photochemical applications. [3] References 1. Hill, C. L., et al. "The Role of Iron NHC Complexes in Photochemical Catalysis and Energy Conversion." Chemical Reviews , 2014, 114(18), 9015-9047. DOI: 10.1021/cr500213f 2. De Kreijger, S., et al.“Investigation of the Excited-State Electron Transfer and Cage Escape Yields Between Halides and a Fe (III) Photosensitizer.” Journal of the American Chemical Society , 2024, 146(15), 10286–10292. DOI: 10.1021/ jacs.4c02808. 3. Leigh, D. A., et al. "NHC-Functionalized Iron Complexes in Photochemical and Catalytic Applications. " Nature Reviews Chemistry, 2020, 4, 129-144. DOI: 10.1038/s41570-019-0107-7
P02
© The Author(s), 2025
Sustainable green hydrogen production and value-added products through earth-abundant semiconductor-sensitized TiO 2 via PEC water splitting Oshnik Maurya, Archana Kalekar Department of Physics, Institute of Chemical Technology, Mumbai, 400019, India The transition to a low-carbon energy economy has intensified interest in photoelectrochemical (PEC) water splitting for sustainable green hydrogen production. However, widespread deployment is limited by the high cost and performance constraints of current photoelectrode materials. Titanium dioxide (TiO 2 ) remains a benchmark photoanode due to its chemical stability and abundance, but its wide bandgap restricts light absorption to the ultraviolet region, reducing overall PEC efficiency. To address this, we investigated the sensitization of TiO 2 with earth-abundant, visible-light-active semiconductors such as bismuth chalcogenides and kesterites. These materials extend light absorption into the visible region and promote efficient charge separation due to favorable band alignment. The resulting composites were characterized using XRD, SEM, UV-Vis, and PL techniques, confirming improved light harvesting and reduced electron-hole recombination. Electrochemical analyses revealed enhanced photocurrent, better charge transfer kinetics, and improved long-term stability under simulated solar conditions. In addition to water oxidation, the sluggish oxygen evolution reaction (OER) step was leveraged for value-added chemical production by introducing glycerol as a sacrificial agent. The modified TiO 2 films showed effective PEC activity toward glycerol oxidation, generating different value added products.This dual-functional approach not only boosts system efficiency but also improves economic feasibility. A framework for integrating these materials into scalable PEC devices is proposed, offering a promising pathway for low-cost hydrogen production coupled with chemical valorization. The study contributes valuable insights into the design of multifunctional, earth- abundant materials for next-generation PEC systems.
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© The Author(s), 2025
Insights into charge dynamics in Y6-based heterojunction organic nanoparticles for hydrogen evolution Keren A i 1 , Martina Rimmele 1 , Suzzy Su 1 , Yasmine Baghdadi 2 , Charles Jeffreys 3 , Bhatti, Humza 2 , Salvador Eslava 2 , Soranyel Gonzalez-carrero 4 , Martin Heeney 1 and James Durrant 1 1 Department of Chemistry, Imperial College London, London, UK, 2 Department of Chemical Engineering, Imperial College London, London, UK, 3 Applied Physics Program, Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Saudi Arabia, 4 Department of Organic Chemistry/Institute of Molecular Science (ICMol), University of Valencia, Spain Organic semiconductors, known for their tunable energy levels and strong light absorption, have emerged as promising materials for various optoelectronic applications. Over the past two decades, significant advancements in organic photovoltaics (OPVs) have been driven by the bulk-heterojunction (BHJ) architecture, which facilitates efficient charge separation through donor-acceptor interfaces that enable effective exciton dissociation upon photoexcitation. Recently, the BHJ architecture has been adapted for photocatalytic hydrogen evolution reactions (HER) via water splitting. BHJ-based nanoparticles (NPs), comprising both donor and acceptor components, have demonstrated superior performance in exciton dissociation and HER efficiency 1,2 . In this study, we investigated the photocatalytic performance of the widely successful non-fullerene acceptor (NFA) Y6 and its derivative L8-BO in BHJ nanoparticles prepared via the mini-emulsion method 2 . When blended with the low-cost polymer donor FO6-T, the L8-BO BHJ NPs exhibited nearly twice the HER rate of Y6 at an optimized donor/acceptor (D/A) ratio of 1:4. Cryo-transmission electron microscopy (cryo-TEM) revealed a highly crystalline packing of L8-BO inside the BHJ NPs, in contrast to the amorphous morphology observed in Y6 BHJ NPs. Interestingly, this morphology trend differs from film morphologies, where Y6 exhibits higher crystallinity 3 . These morphological differences were further reflected in the absorption spectra: Y6 showed a significant change in absorption between films and NPs, whereas L8-BO maintained consistent spectral features. To correlate the observed morphology with HER performance, transient absorption spectroscopy (TAS) was used to investigate charge generation. Due to its high crystallinity, the L8-BO BHJ NPs exhibited low yield charge generation, likely caused by poor intermixing between donor and acceptor phases. In contrast, the Y6 BHJ NPs showed efficient charge generation due to its amorphous and intermixed morphology. Despite this, photoluminescence (PL) quenching measurements also supported the charge generation difference. To understand why good charge generation in Y6 BHJ NPs doesn’t correlate with the HER performance, the photo- induced absorption (PIA) technique is utilised to probe the charge accumulation in the timescale of seconds. The PIA revealed that charge accumulation in the L8-BO BHJ NPs was approximately twice as high as in the Y6 BHJ NPs, aligning with the observed HER performance. This highlights the role of crystalline morphology in stabilizing charge accumulation, which prolongs charge lifetimes and enhances interactions with co-catalysts. These findings reveal an inverse morphology-performance relationship between films and NPs for Y6 and L8-BO, offering new insights into charge dynamics within BHJ NPs. This work underscores the importance of morphology control in optimizing photocatalytic performance and opens up new avenues for BHJ-based photocatalysis. References 1. Kosco, J., Gonzalez-Carrero, S., Howells, C.T. et al. Generation of long-lived charges in organic semiconductor heterojunction nanoparticles for efficient photocatalytic hydrogen evolution. Nat Energy 7 , 340–351 (2022). 2. Kosco, J., Bidwell, M., Cha, H. et al. Enhanced photocatalytic hydrogen evolution from organic semiconductor heterojunction nanoparticles. Mater. 19 , 559–565 (2020). 3. An, K., Zhong, W., Peng, F. et al. Mastering morphology of non-fullerene acceptors towards long-term stable organic solar cells. Nat Commun 14 , 2688 (2023).
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© The Author(s), 2025
Engineering Cu modified Sn-based catalysts for enhanced electrochemical carbon dioxide reduction Saira Ajmal Uppsala University, Sweden The rising concentration of atmospheric CO 2 due to anthropogenic emissions is a major contributor to climate change, necessitating innovative strategies for its mitigation. Electrocatalytic CO 2 reduction (CO2RR) into high- value hydrocarbons and fuels offers a sustainable pathway to address this challenge, leveraging existing energy infrastructure and enabling carbon recycling. In our work, we explore the synthesis of CuSn-based catalysts for enhanced CO 2 RR performance. SnO 2 thin films were fabricated via atomic layer deposition (ALD), followed by modification with copper using controlled techniques. The role of Cu in altering the electronic structure and tuning the active sites of Sn-based catalysts. Our Initial results demonstrate that Cu incorporation significantly enhances the selectivity toward C 2 products, indicating its crucial role in facilitating C–C coupling during CO 2 electroreduction. This study might provide new insights into the design of bimetallic electrocatalysts for efficient and selective CO 2 conversion.
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© The Author(s), 2025
Efficient photo-assisted electrocatalytic oxygen evolution using engineered CeO 2 Zahra Albu 1,4 , Nawal Al Abass 2 , Preetam Kumar Sharma 1 , Talal Qahtan 3 , Siming Huang 1 , Nusrat Rashid 1 , Galyam Sanfo 1 , Migual Pineda 5 , Abduljabar Al-Sayoud 6 , Bandar AlOtaibi* 4 , Mojtaba Abdi-Jalebi* 1 1 Institute for Materials Discovery, University College London, Malet Place, London WC1E 7JE, United Kingdom, 2 The Center of Excellence for Advanced Materials and Manufacturing, King Abdulaziz City for Science and Technology, Saudi Arabia, Riyadh 11442, 3 Hydrogen Technologies Institute, King Abdulaziz City for Science and Technology, Saudi Arabia, Riyadh 11442, 4 Department of Physics, College of Science and Humanity Studied in Alkharj, Riyadh 11442, Saudi Arabia, 5 Department of Chemical Engineering, University College London, London, WC1E 7JE, UK, 6 Department of Material Science and Engineering, King Fahd University of The production of green hydrogen through visible-light-driven water splitting represents an appealing avenue for sustainable and environmentally friendly hydrogen generation [1] . However, the efficiency of photoelectrocatalysis in solar-to-hydrogen conversion is constrained by the limited light absorption of most available semiconductor materials, which typically have wide bandgaps, restricting them to the UV range [2] . Consequently, there is a need to develop catalysts capable of absorbing visible light. In this context, we propose a strategy to enhance the photoelectrocatalytic activity of CeO 2 by doping it with transition metals such as Ni and Co. This doping extends the material's visible light absorption and introduces d-states within the forbidden bandgap. Verification of bandgap narrowing and extended visible light absorption was conducted through UV-vis diffuse reflectance, revealing that Ni and Co doping reduced the bandgap of CeO 2 from 3.0 eV to 2.7 eV and 2.6 eV, respectively. Density functional theory (DFT) calculations supported these findings, confirming bandgap narrowing and the presence of d-states. Moreover, photoelectrochemical measurements demonstrated superior photoelectrocatalytic activity in the Ni-doped sample compared to Co-doped CeO 2 . This enhanced catalytic performance is attributed to the introduction of d-states near the Fermi level through Ni doping, while Co doping introduced d-states located near the conduction band of CeO 2 . Our surface Slab calculations further revealed that Ni-doped CeO2 reduced the Gibbs energy for oxygen evolution reaction (OER) intermediate adsorption compared to pure and Co-doped CeO 2 . This suggests that doping plays a pivotal role in modulating the electronic environment of the catalyst, facilitating charge transfer through defect d-states near the Fermi level and accelerating reaction kinetics. In summary, our study underscores that doping CeO 2 with transition metals like Ni and Co can enhance its photoelectrocatalytic activity for green hydrogen production. Ni doping, in particular, leads to the creation of d-states near the Fermi level, resulting in improved catalytic performance. These findings contribute significantly to the development of efficient catalysts for visible-light-driven water splitting and pave the way for sustainable hydrogen production. References 1. Knezevic, M., Hoang, TH., Rashid, N., Abdi-Jalebi, M., Colbeau-Justin C., Ghazzal, M. N. Recent development in metal halide perovskites synthesis to improve their charge-carrier mobility and photocatalytic efficiency. Sci. China Mater. 66, 2545–2572 (2023). 2. FUJISHIMA, A., HONDA, K. Electrochemical Photolysis of Water at a Semiconductor Electrode. Nature 238, 37–38 (1972). Petroleum & Minerals, Saudi Arabia, Dammam, 31261 Email: bmalotaibi@kacst.edu.sa, m.jalebi@ucl.ac.uk
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© The Author(s), 2025
Investigating the effect of graphene oxide on the photocatalytic efficiency of Bi-BiOBr and P25 TiO 2 composites for NOx removal Paransa Alimard 1,2,3 , Andreas Kafizas 1,3 1 Imperial College London, Department of Chemistry, Molecular Science Research Hub, White City Campus, 82 Wood Lane, London, W12 0BZ, U.K., 2 Grantham Institute- Climate Change and the Environment, and the Science and Solutions for a Changing Planet Doctoral Training Partnership (DTP), Imperial College London South Kensington Campus, London, SW7 2AZ, U.K., 3 London Centre for Nanotechnology, Imperial College London, London SW7 2AZ, U.K P25 and BiOBr exhibit significant photocatalytic activity for nitrogen oxide (NOx = NO + NO2) removal [1, 2] . This study explores the effect of incorporating Bi-BiOBr, P25, and 1 wt.% graphene oxide (GO) on photocatalytic performance for NO x degradation. The Bi-BiOBr/P25/GO composite was synthesized using a one-pot solvothermal method. Its structural, morphological, and compositional properties, along with its photocatalytic efficiency, were analysed using various techniques, including SEM, HR-TEM, XRD, Raman spectroscopy, UV-vis spectroscopy, XPS, PL spectroscopy, DR-TAS, and NO x photocatalytic testing according to the ISO 22197-1:2016 standard. The Bi-BiOBr/P25/GO composite demonstrated superior NO x removal efficiency compared to its individual components. Under NO gas exposure, it achieved a NO x removal rate of 21.9%, surpassing P25 (8.7%), Bi-BiOBr (6.5%), and GO (0%). In NO2 reactions, it removed approximately 15% of NO x , outperforming P25 (~10%), Bi- BiOBr (~5%), and GO (0%). References 1. Alimard, P., Gong, C., Itskou, I., Kafizas, A. Achieving High Photocatalytic NO x Removal Activity Using a Bi/BiOBr/ TiO 2 Composite Photocatalyst. Chemosphere 368 (2024)143728. 2. Olaifa, O., Alimard, P., Itskou, I., Eisner, F., Petit, C., Diez-Gonzalez, S., Kafizas, A., Purifying the Air with Photocatalysis: Developing Bismuth Oxybromide/Copper Phthalocyanine Composite Photocatalyst Filters with Enhanced Activity for NOx Removal. ChemPhotoChem,e202400346.
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© The Author(s), 2025
Perovskite photoelectrocatalysis for solar driven chemical synthesis Virgil Andrei* Yusuf Hamied Department of Chemistry, University of Cambridge, United Kingdom *va291@cam.ac.uk, Photoelectrochemistry (PEC) presents a direct pathway to solar fuel synthesis by integrating light absorption and catalysis into compact electrodes. [1-3] Among established light absorbers, metal halide perovskites have emerged as promising alternatives for solar fuel synthesis, enabling unassisted water splitting [4,5] and CO 2 reduction to syngas. [6-9] Yet, PEC hydrocarbon production remains elusive due to high catalytic overpotentials and insufficient semiconductor photovoltage. Here we demonstrate ethane and ethylene synthesis by interfacing lead halide perovskite photoabsorbers with suitable copper nanoflower electrocatalysts. [10] The resulting perovskite photocathodes attain a 9.8% Faradaic yield towards C 2 hydrocarbon production at 0 V against the reversible hydrogen electrode. The catalyst and perovskite geometric surface areas strongly influence C 2 photocathode selectivity, which indicates a role of local current density in product distribution. The thermodynamic limitations of water oxidation are overcome by coupling the photocathodes to Si nanowire photoanodes for glycerol oxidation into value-added chemicals like glycerate, lactate, acetate and formate. These unassisted perovskite–silicon PEC devices attain partial C 2 hydrocarbon photocurrent densities of 155 µAcm −2 , 200-fold higher than conventional perovskite–BiVO 4 artificial leaves for water and CO 2 splitting. These insights establish perovskite semiconductors as a versatile platform towards PEC multicarbon synthesis. [10]
References 1. Sokol, K. P.; Andrei, V. Nat. Rev. Mater. 2022, 7, 251–253. 2. Andrei, V.; Roh, I.; Yang, P. Sci. Adv. 2023, 9, eade9044. 3. Andrei, V.; Jagt, R. A. et al. Nat. Mater. 2022, 21, 864–868. 4. Andrei, V. et al. Adv. Energy Mater. 2018, 8, 1801403.
5. Pornrungroj, C.; Andrei, V et al. Adv. Funct. Mater. 2021, 31, 2008182. 6. Andrei, V.; Reuillard, B.; Reisner, E. Nat. Mater. 2020, 19, 189–194. 7. Andrei, V.; Ucoski, G. M. et al. Nature 2022, 608, 518–522. 8. Pornrungroj, C.; Andrei, V.; Reisner, E. J. Am. Chem. Soc. 2023, 145, 13709–13714. 9. Andrei, V.; Chiang, Y.-H.; Rahaman, M.; Anaya, M. et al. Energy Environ. Sci. 2025. DOI: 10.1039/D4EE05780E. 10. Andrei, V.; Roh, I. et al. Nat. Catal. 2025, 8, 137–146.
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EASI-Fuel solar to methane integrated device: a versatile tool for solar to X process assessment Corentin Gabier 1 , Grégory Cwicklinski 1 , Isabelle Rougeaux 2 , Christine Cavazza 1 , Vincent Artero 1 , Jérôme Gauthier 3 , Muriel Matheron 2 1 Université Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000 Grenoble, France, 2 Université Grenoble Alpes, CEA, LITEN, DTNM, 38000 Grenoble, France, 3 Université Paris-Saclay, CEA, List, F-91120, Palaiseau, France Sunlight-to-X devices offer key advantages over traditional renewable synthetic molecules production processes (for hydrogen, fuels, fertilizers…), such as grid resilience and modularity. 1 However, challenges remain to reach practical deployment, especially regarding scalability and stability. To trigger progress in maturity level of such technologies, the EIC proposed an innovation prize on artificial photosynthesis, where integrated devices, producing a fuel from water and CO 2 as feedstocks, had to run autonomously in a real outdoor environment for 72 h. 2 As participants, we assembled a solar to methane demonstrator, reaching a solar to fuel efficiency of 5 % with an active area of 342 cm², overcoming challenges related to upscale and process integration. 3-5 In this contribution, we focus on the development of such a demonstrator into a versatile instrument for the characterization of various solar to X pathways. The goal is to highlight, characterize and solve the integration challenges to reach efficient and flexible photon to molecule conversion routes. This includes not only hardware assembly but also relevant data collection, storage and exploitation in order to derive meta models of the various conversion bricks. References 1. Lubbe et al. Current Opinion in Green and Sustainable Chemistry. 2023 Feb 1;39:100732 https://doi.org/10.1016/j. cogsc.2022.100732 2. European Commission: Directorate-General for Research and Innovation, Artificial photosynthesis – Fuel from the sun – EIC Horizon Prize , Publications Office of the European Union, 2018,https://data.europa.eu/doi/10.2777/063322 3. Maragno et al ., Joule, 2024, 8, 2325 https://doi.org/10.1016/j.joule.2024.05.012
4. Cwicklinski et al ., Sustainable Energy Fuels, 2024, 8, 1068 https://doi.org/10.1039/D3SE01550E 5. Maragno et al ., Sustainable Energy Fuels, 2024, 8, 3726 https://doi.org/10.1039/D4SE00547C
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© The Author(s), 2025
Re-evaluating the stability of nanoscale aluminium oxide barrier layers in electrochemical conditions Andrew J. Bagnall, Ziwen Zhao, Mun Hon Cheah, Alina Sekretareva Department of Chemistry – Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden Nanoscale insulating barriers based on metal oxides have been widely used to control the flow of electrons and/or as protective layers in a diverse array of systems, including microelectronics, 1 photovoltaics, 2 analytical electrochemistry, 3 electrocatalysis, 4 and photoelectrocatalysis. 5 Atomic layer deposition (ALD) allows the deposition of such films with an exceptional degree of control, uniformity, conformality and pinholefreeness. 6 Aluminium oxide (Al 2 O 3 ) grown from trimethylaluminium and water has long been considered a model ALD process for its reliability under relatively mild conditions. 6 Along with its highly insulating electronic structure, the thermodynamic stability of Al 2 O 3 across a wide range of potentials at neutral pH make it a key candidate for tunnelling barriers in photoelectrodes, but this has thus far been hindered by underexplored stability issues, attributed to surface restructuring, with specific ionic species suspected to play a role. 7,8
A systematic study into the stability and insulation of Al 2 O 3 films in various buffers across the pH scale is therefore presented, assessing their viability for shorter-term applications and fundamental studies of photoelectrocatalysis, where high barriers to both oxidation and reduction may be required to control the flow of non-thermal photoexcited carriers. References 1. R. Goul et al., AIP Advances , 2019 , 9 , 025018. 2. J. Zhang et al., ChemSusChem , 2017 , 10 , 3810–3817. 3. J. Kim et al., Proc. Natl. Acad. Sci. U.S.A. , 2013 , 110 , 20918–20922. 4. A. K. Vannucci et al., Proc. Natl. Acad. Sci. U.S.A. , 2013 , 110 , 20918–20922. 5. A. M. Lapides et al., Chem. Sci. , 2015 , 6 , 6398–6406.
6. S. M. George, Chem. Rev. , 2010 , 110 , 111–131. 7. S. A. Willis et al., Langmuir , 2021 , 37 , 14509–14519. 8. G. Kim et al., J. Electroanal. Chem , 2020 , 877 , 114550.
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