High-selective and stable electrocatalysts are highly desired for CO2 reduction in large scale. To achieve CO2 reduction to CO with high selectivity and longtime running stability, CuIn alloy nanowires (NWs) is prepared by the combining of chemical oxidation and electrodeposition method. More importantly, due to electrochemical pretreatment during synthesis process, the CuIn alloy shows remarkable stability and its structure remains unchanged under harsh negative bias during CO2 reduction. In addition, the alloy NWs achieve the optimal CO2 to C...