Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.094
Publication date: 11th July 2022
Producing electrodes that comprise highly active but low-cost catalysts for water splitting reactions is still a great challenge for developing new technologies for green energy. In the last few years, transition metal chalcogenides such as NiSe and CoSe were studied as electrochemical catalysts, displaying good electrocatalytic activity. Combining Ni and Co to form ternary compounds allows tuning the active sites for the reaction. In addition, NiSe and CoSe are photothermal materials, where irradiating with light leads to a substantial increase in their temperature.[1] Combining these two functionalities, these materials can be bifunctional, such that their heating contributes to the apparent catalytic reaction rate.
Ternary (NixCoy)Se nanoparticles were synthesized via a solvothermal method. The resulting nanoparticles were 15-30 nm in size, with a hexagonal crystallographic structure. The ternary nanoparticles demonstrated enhanced electro-catalytic activity towards the hydrogen evolution reaction in acidic conditions. (Ni0.25Co0.75)Se exhibited a significantly improved HER performance relative to the binary compounds with an overpotential of 190 mV at 10 mA cm-2 and a Tafel slope of 53 mV dec-1. As for the photothermal performance, (Ni0.9Co0.1)Se proved to be the most efficient photothermal material in the set. Future work will focus on utilizing them for photo-thermal assisted electrochemistry and evaluating the added value of such setups.
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