Abstract
Developing high-performance electrocatalysts for CO 2 reduction reaction (CO 2 RR) is crucial since it is beneficial for environmental protection and the resulting value-add chemical products can act as an alternative to fossil feedstocks. Nonetheless, the direct reduction of CO 2 into long-chain hydrocarbons and oxygenated hydrocarbons with high selectivity remains challenging. Copper (Cu) shows a distinctive advantage that it is the only pure metal catalyst for reducing CO 2 into multi-carbon (C 2+ ) products and the certain facets ( e.g. , (100), (111), (111)) of Cu nanocrystals exhibit relatively low energy barriers for the formation of specific products ( e.g. , CO, HCOOH, CH 4 , C 2 H 4 , C 2 H 5 OH, and other C 2+ products). Therefore, extensive studies have been carried out to explore the relationship between the facets of Cu nanocrystals and corresponding catalytic products. In this review, we will discuss the crystal facet-dependent electrocatalytic CO 2 RR performance in metallic Cu catalysts, meanwhile, the detailed reaction mechanisms will be systematically summarized. In addition, we will provide a personal perspective for the future research directions in this emerging field. We believe this review is helpful to guide the design of high-selectivity Cu-based electrocatalysts for CO 2 RR. In this review, we discuss the crystal facet-dependent electrocatalytic CO2 reduction performance in metallic Cu catalysts, meanwhile, the detailed reaction mechanisms are systematically summarized.
Published Version
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