Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.169
Publication date: 18th July 2019
Electrochemical reduction of CO2 is attractive to store renewable electricity in the form of carbon‐based fuels enabling a carbon-neutral development. Efficient electrochemical reduction of CO2 requires catalysts that combine high productivity, high selectivity, and low overpotential. Programming catalysts to achieve these metrics is challenging, as they can undergo extensive surface reconstruction during operation modifying their physicochemical properties. I will present different approaches to program this reconstruction, in-situ monitoring catalyst transformation, leading to CO2 electroreduction to carbon monoxide or formate at high efficiency. The productivity of gas-phase electrolysis is today curtailed by the limited gas diffusion through the electrolyte to catalyst’ active sites, shrinking the volume over which reactants and electrons overlap at the catalyst. I will present a materials strategy that decouples gas, ion and electron transport breaking this tradeoff. The catalysts achieve CO2 electroreduction towards multicarbon products at selectivities > 80% and partial current densities beyond 1.3 A/cm2 at ~50% cathodic energy efficiency - a sixfold increase over the best previously reported CO2 reduction catalysts.
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