Design of a Single-Atom Indiumδ+-N4 Interface for Efficient Electroreduction of CO2 to Formate.

Main group Indium (In) is a promising electrocatalyst which triggers CO2 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 Inδ+-N4 atomic interface sites for CO2 electroreduction to formate with high efficiency. This catalyst exhibites an extremely large turnover frequency (TOF) up to 12500 h-1 at -0.95 V vs. RHE, with FE for formate of 96 % and current density of 8.87 mA cm-2 at low potential of -0.65 V vs. RHE. Our findings present a feasible strategy for the accurate regulation of main-group indium catalysts for CO2 reduction at atomic scale.

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