Cu 2 In/In core–shell interface regulating Cu 0/+ enables selective *OCHO capture for efficient CO 2 -to-formate conversion across a wide potential range

This study synthesizes a well-defined Cu 2 In/In core–shell catalyst. The Cu 2 In core and In shell synergistically induce interfacial electronic reconstruction, which precisely regulates Cu 0/+ species, achieving a peak FE formate of 93.6%.