Promoting CO2 reduction to formate selectivity on indium-doped tin oxide nanowires

Electrochemical reduction of CO2 to various chemicals is a promising approach to dealing with excessive CO2 accumulation in the atmosphere. Even though numerous electrocatalysts have been extensively utilized for the reaction, several challenges remain such as high overpotential, poor stability, and low selectivity followed by the domination of hydrogen formation. To overcome these problems, multi-component materials have been pro-posed due to their advanced catalytic activity compared to single-component materials. Herein, we present preparation of the indium-doped tin oxide nanowires (In-SnO2 NWs) as an efficient electrocatalyst to promote CO2 reduction into formate. The unique 1D structure of SnO2 NWs with simultaneously doped-In (5.4at% In) can enhance the selectivity toward formate by up to-82 % compared to bare SnO2 NWs (-58.9 %) at-1.04 V (vs RHE). The modified SnO2 surface driven by In-doping induces electron delocalization in between, and the surface defects provide more active sites. Thus, the intermediate could be stably adsorbed to produce more formate ions.

Automated summary

Electrochemical reduction of CO2 to various chemicals is a promising approach, but challenges such as high overpotential, poor stability, and low selectivity remain. Multi-component materials, like indium-doped tin oxide nanowires (In-SnO2 NWs), have been proposed to overcome these problems. The unique 1D structure and In-doping of SnO2 NWs enhance formate selectivity by up to 82% compared to bare SnO2 NWs at -1.04 V (vs RHE) by inducing electron delocalization and providing more active sites for stable adsorption of intermediates.