Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.118
Publication date: 23rd September 2021
Many technical challenges remain for implementing CO2 electrolysis as a practical means for CO2 utilization. A key challenge for CO2 electrolysis is developing heterogeneous catalysts that can steer complex reaction networks and selectively convert CO2 into the desired product. First, I will describe how epitaxially grown Cu thin films can be used to probe CO2 electrolysis structure-reactivity relationships. We demonstrate that undercoordinated sites are selective motifs for oxygenates and C-C coupling using a combination of electrocatalysis experiments and in situ surface probe microscopy. Next, I will discuss how the same growth methods can be used to controllably deposit noble or base metal atoms onto well-defined Cu electrocatalysts and systematically investigate atomic-scale bimetallic effects. The metal atoms tend to suppress CO reduction to oxygenates and hydrocarbons while promoting competing pathways to CO, formate, and hydrogen, suggesting that the metal atoms segregate to undercoordinated Cu sites during physical vapor deposition. Finally, I will provide some perspectives on how to improve the intrinsic activity and selectivity of Cu through bimetallic effects, showing specific examples of enhancing C-C coupling through tandem catalysis and CO production through alloying with Zn.
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