Oxygen‐Pinned Ag 1 In Single‐Atom Alloy for Efficient Electroreduction CO 2 to Formate

Abstract Catalytic conversion of CO 2 to valuable formate provides a pathway to carbon neutrality. Indium (In), as a promising catalyst, exhibits high selectivity toward formate due to its suitable bonding ability of *OCHO intermediates. However, it still suffers from the CO 2 activation and the protonation steps, leading to low activity and productivity. Here, an oxygen‐pinned stabilization AgIn single‐atom alloy (O p ‐Ag 1 In) is presented for efficiently converting CO 2 into formate (≈92.03% Faradaic efficiency) with a partial current density of 13 mA cm −2 at −0.95 V vs RHE by using standard H‐type reactor. The O p ‐Ag 1 In electrocatalyst is more effective in converting CO 2 to formate because the activated In sites of O p ‐Ag 1 In catalyst regulate CO 2 activation and protonation step of CO 2 RR and formation of sufficient amounts of *OCHO, which are confirmed by in situ spectroscopic and theoretical calculations. The continuous production of formate is showcased at 70 mA cm –2 for 24 h by utilizing a flow cell and O p ‐Ag 1 In.