Modulating Intermediate Reactants Adsorption Via In-Sn Interface for Selective Co2 Electroreduction

Abstract

Electrochemical CO2 reduction reaction (CO2RR) offers a promising route for creating an artificial carbon cycle, while it is limited by the controllable generation of products. Herein, we proposed a rational strategy to realize the dynamic regulation of the CO2 electrolysis toward C1 product. The bimetallic interface has been introduced into the composition-dependent In-Sn nanoparticle (NPs) with a core-shell structure by a simple co-electrodeposition approach that enabled the optimized binding of the HCOO* and OCHO* intermediates, which allowed to adjust the CO2 reaction pathway toward the formation of Formate or CO. Using the optimal In-Sn NPs, we achieved a current density of -31.27 mA cm-2 at -0.97 V vs. RHE, including -17.82 mA cm-2 for formate and -12.98 mA cm-2 for syngas with the CO/H2 ratio of 1:1. Our study demonstrated that the bimetallic interface plays a crucial role in modulating the adsorption of intermediates and offers helpful guidance for designing efficient electrocatalysts for CO2RR.

Keywords: In-Sn Interface, Intermediates Adsorptions, Core-Shell Structure, Carbon Dioxide Reduction