Needle promoted HER performance in alkaline condition Liquan Zhang , Guanjie He, Ivan Parkin UCL, UK As one of the highest energy density and environmental friendly energy carrier, hydrogen is expected to be used as a fuel for cars, trucks, and drones. While despite many advantages, the energy efficiency of hydrogen from water splitting remains a concern. To improve efficiency, the reaction potential should be as low as possible. In this paper, a needle-shaped current collector was synthesized, and the effect of the needles on the catalyst activity in an alkaline environment was explored. The study found that the tip effect can effectively lower overpotentials of RuO x . At a current density of 10mA/cm 2 , with the same Ru loading the current collector with needles reduced the overpotential from 114mV to 47mV. The study found that the existence of tips greatly reduces the reaction resistance. Through the simulation calculation, it is found that tip effect makes a high electric field intensity in the sharp tips, which promote the reaction, and the effect especially obvious in low overpotentials. Thus, the tip effect makes the current collector with needles perform better. The conclusion of this study is also applicable to all substrates with corners and protrusions, which provide a reference for the designing of catalyst current collectors. References 1. Ishaq, H.; Dincer, I.; Crawford, C. A review on hydrogen production and utilization: Challenges and opportunities. International Journal of Hydrogen Energy 2022 , 47 (62), 26238-26264. DOI: 10.1016/j.ijhydene.2021.11.149. 2. Teimouri, A.; Zayer Kabeh, K.; Changizian, S.; Ahmadi, P.; Mortazavi, M. Comparative lifecycle assessment of hydrogen fuel cell, electric, CNG, and gasoline-powered vehicles under real driving conditions. International Journal of Hydrogen Energy 2022 , 47 (89), 37990-38002. DOI: 10.1016/j.ijhydene.2022.08.298. Özbek, E.; Yalin, G.; Ekici, S.; Karakoc, T. H. Evaluation of design methodology, limitations, and iterations of a hydrogen fuelled hybrid fuel cell mini UAV. Energy 2020 , 213 . DOI: 10.1016/j.energy.2020.118757. 3. Wang, T.; Tao, L.; Zhu, X.; Chen, C.; Chen, W.; Du, S.; Zhou, Y.; Zhou, B.; Wang, D.; Xie, C.; et al. Combined anodic and cathodic hydrogen production from aldehyde oxidation and hydrogen evolution reaction. Nature Catalysis 2021 , 5 (1), 66-73. DOI: 10.1038/s41929-021-00721-y. 4. Dincer, I.; Acar, C. Review and evaluation of hydrogen production methods for better sustainability. Int. J. Hydrogen Energy 2015 , 40 (34), 11094-11111, Review. DOI: 10.1016/j.ijhydene.2014.12.035. Liu, Y.; Yu, G.; Li, G.-D.; Sun, Y.; Asefa, T.; Chen, W.; Zou, X. Coupling Mo2C with Nitrogen-Rich Nanocarbon Leads to Efficient Hydrogen-Evolution Electrocatalytic Sites. Angewandte Chemie-International Edition 2015 , 54 (37), 10752-+. DOI: 10.1002/anie.201504376. 5. Anantharaj, S.; Ede, S. R.; Sakthikumar, K.; Karthick, K.; Mishra, S.; Kundu, S. Recent Trends and Perspectives in Electrochemical Water Splitting with an Emphasis on Sulfide, Selenide, and Phosphide Catalysts of Fe, Co, and Ni: A Review. Acs Catalysis 2016 , 6 (12), 8069-8097. DOI: 10.1021/acscatal.6b02479. 6. Gupta, S.; Patel, M. K.; Miotello, A.; Patel, N. Metal Boride ‐ Based Catalysts for Electrochemical Water ‐ Splitting: A Review. Advanced Functional Materials 2019 , 30 (1). DOI: 10.1002/adfm.201906481.
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