Design of a Single-Atom Indiumδ+-N4Interface for Efficient Electroreduction of CO2to Formate

Main-group element indium (In) is a promising electrocatalyst which triggers CO(2)reduction to formate, while the high overpotential and low Faradaic efficiency (FE) hinder its practical application. Herein, we rationally design a new In single-atom catalyst containing exclusive isolated In delta+-N(4)atomic interface sites for CO(2)electroreduction to formate with high efficiency. This catalyst exhibits an extremely large turnover frequency (TOF) up to 12500 h(-1)at -0.95 V versus the reversible hydrogen electrode (RHE), with a FE for formate of 96 % and current density of 8.87 mA cm(-2)at low potential of -0.65 V versus RHE. Our findings present a feasible strategy for the accurate regulation of main-group indium catalysts for CO(2)reduction at atomic scale.