摘要：Sn-based electrocatalysts have been gaining increasing attention due to their potential contribution in the conversion of co2 into HcoOH driven by sustainable energy sources;however,their actual capability to catalyze co2 reduction reaction(co2RR)still cannot meet the requirements of commercial-scale *** developing Snbased catalyst is of vital ***,the sheet-like heterophase Sn O2/Sn3O4 with a high density of phase interfaces has been first engineered by a facile hydrothermal process,with Sn3O4 as the dominant *** evidences from experiments and theoretical simulation indicate that the charge redistribution and built-in electric field at heterophase interfaces boost co2 adsorption and HcoO*formation,accelerate the charge transfer between the catalysts and reactants,and ultimately greatly elevate the intrinsic activity of the heterophase Sn O2/Sn3O4 towards co2 ***,the in-situ generated porous structure and metal Sn during co2 RR improve the mass transmission within the interlayer volume and the conductivity of Sn O2/*** heterophase Sn O2/Sn3O4 displays high activity and selectivity for co2 RR,achieving an improvement in co2 reduction current density,88.3%Faradaic efficiency of HcoOH conversion at-0.9 VRHE,along with a long-term tolerance in co2 *** study demonstrates that heterophase interface engineering is an efficient strategy to regulate advanced catalysts for different applications.