Engineering Bimetallic Copper‐Tin Based Core‐Shell Alloy@Oxide Nanowire as Efficient Catalyst for Electrochemical CO2 Reduction

Abstract Pursuing both high effective and selective electrocatalysts is significant for efficient and low‐cost electrochemical carbon dioxide (CO 2 ) reduction. Here, we design a novel bimetallic alloy/oxide nanowire catalyst with core‐shell configuration. A typical CuSn alloy core provides high electrical conductivity while the amorphous Cu doped SnO 2 shell guarantees the catalytic activity and selectivity for CO 2 reduction process. Computational studies further elucidate the important role of Cu doped SnO 2 layer in the electrocatalytic selectivity for formate and the restraint of hydrogen production. Benefited from the well‐designed components and hierarchical configuration, the as‐prepared electrocatalyst displays a partial current density of 30 mA cm −2 with a Faradaic efficiency of 78 % at −0.9 V vs. reversible hydrogen electrode (RHE) for formate. This work provides a new pathway to design advanced electrocatalyst for CO 2 electrochemical reduction.