Electrosynthesis of cobalt imidazolate framework using bio solvents as a solvent medium to produce high crystalline MOFs tested for supercapacitor application Vijayakumar Manavalan 1,2 , Vesna Najdanovic-Visak 1 , Stephen D. Worrall 2 1 Chemical Engineering and Applied Chemistry, Aston University, UK, 2 Aston Institute of Materials Research, Aston University, UK Across the world, numerous researchers and scientists have been trying to explore alternative energy storage systems such as secondary batteries, supercapacitors, and fuel cells that are cost-effective, clean, and renewable. These energy storage devices possess the ability to deliver superior charge storage as compared to conventional systems and hence offer a huge potential in satisfying the current and future energy demands. For these devices, an electrode material with a highly selective electrochemical storage ability is regarded as one of the main prerequisites that directly control their efficiency. Electrode materials with appropriate dimensions, morphology, textural features, and surface functionalization are suitable for charge storage. Considering that whole-body participation can significantly improve charge storage, three-dimensional (3D) materials are a perfect choice, wherein a large surface area for a high charge accommodation is available for charge storage. Metal organic framework (MOF), a pseudo-based electrode material with high surface area and robust structure, is one of the highly efficient electrode materials for energy storage applications that has been explored in recent years. The MOF has unique structural morphology and structural integrity which make it a potential material in the recent years. However, due to its poor electronic conductivity and limited access to electrolyte ions on their active sites, MOF has necessitated significant research and development in the energy storage industry. The main focus is on improving the electrical conductivity and storage performance of the MOF through electro- synthesis method to enrich the chemical stoichiometry of MOFs. The electrochemical synthesis of MOF offers advantages over other conventional synthesis routes in terms of better coating, less energy and shorter reaction time. We investigate novelCyrene TM and GVL solvents in MOF synthesis for their contribution to sustainable and renewable resources in light of detrimental climate change and the depletion of fossil fuels. In the present study, electrochemical synthesis and crystal size optimisation of Cobalt ZIF-67 through anodic electrodeposition was carried out. The effect of different solvents (N,N-dimethylformamide (DMF), Cyrene TM and γ-valerolactone (GVL)), temperature (55, 85, and 105 °C), and time (1, 3, and 5 h) were investigated. More specifically, we investigated the effect of bio solvent (Cyrene TM and GVL) and fossil fuel (DMF)) solvent on the crystal size and morphology. It was observed that bio solvents (Cyrene and GVL) produced more uniform coating and greater crystalline morphology than the DMF solvent. The greater quality coating produced using bio solvents led to an improved performance when they were tested as the electrodes in a supercapacitor. References 1. Worrall, S.; Mann, H.; Rogers, A.; Bissett, M.; Attfield, M.; Dryfe, R. Electrochim. Acta 2016, 197, 228–240. 2. Bhindi, M.; Massengo, L.; Hammerton, J.; Derry, M.J.; Worrall, S.D. Appl. Sci. 2023, 13, 720. 3. Vijayakumar, M.; Sankar, A.; Sri Rohita, D.; Rao, T.; Karthik, M.; ACS Sustainable Chem. Eng. 2019, 7,17175−17185.
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