Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.366
Publication date: 18th December 2023
The electrochemical CO2 reduction reaction (CO2RR) driven by renewable electricity sources represents an attractive approach for converting CO2 into energy-dense fuels and synthetic chemicals, promoting sustainable chemistry and carbon neutrality.1 The reaction involves the transfer of multiple protons coupled to electrons which enables the synthesis of multiple chemicals, but up to date, controlling the reaction selectivity towards multicarbon product formation still poses challenges to be overcome. Besides controlling the reaction selectivity, another challenge is associated with suppressing the hydrogen evolution reaction (HER), which occurs in the same potential window as CO2RR when aqueous-based electrolytes are used. While catalysts can potentially be used to control reaction selectivity, up to date, this was not been fully achieved in the CO2RR field, where all known CO2RR catalysts also catalyze the H2 formation.[2]
Different strategies to increase the multicarbon formation at industrially relevant current densities (> 500 mA cm-2) on Cu and Ni -based electrocatalysts will be discussed in the present communication. This includes synthesizing catalysts having different active centers or developing different catalyst layers in gas diffusion electrodes. The influence of the gas diffusion layer [3] and reactor design will also be highlighted. In addition, strategies to employ high-throughput experimentation for the discovery of new CO2RR electrocatalyst materials will be presented.
This research was funded by BMBF (Bundesministerium für Bildung und Forschung) within the project “MatGasDif – NanoMATerialen als Basis für GasDIFfusionselektroden für die hochselektive CO2 Reduktion“ – 03XP0263 and by the Deutsche Forschungsgemeinschaft within the project 1570/8-1.
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