Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.093
Publication date: 18th July 2019
Copper is the best candidate as metallic electrocatalyst to target commercially valuable hydrocarbons in the electrochemical CO2 reduction reaction (CO2RR). Here we present our work on translating its structure-dependent selectivity to proof of concept devices (H-type and gas-fed cells) using colloidally synthesized Cu nanocrystals in the shape of octahedra (111 terminated) and cubes (100 terminated).[1-2] In addition to shape-dependence we show size dependence. Among the cubic nanocrystals (Cucub NCs), the 44 nm ones showed the highest selectivity towards ethylene, reaching up to 44%.[1] Octahedral nanocrystals (Cuoh NCs) were synthesized with size between 75–310 nm and the smallest one showed the best faradaic efficiency up to 55% for methane.[2] We explain both results through a dual facet mechanisms involving the (100)/(110) interface for the Cucub and (111)/(110) interface for the Cuoh.
Finally, we discuss our very recent results concerning the catalytic performance of the two NCs at industrially relevant conditions (i.e. at -100 to -300 mA/cm2 in a gas-fed flow electrolyzer). Here, we find that the facet-based control on product selectivity remains consistent even in such conditions.
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