(173ae) CuNi Catalyst and Its Structural Evolution for Electrochemical Reduction of CO2

With the rapid increase of CO­₂ emission and energy demand, the electrochemical reduction of CO₂ has attracted tremendous research efforts as a promising strategy to mitigate environmental issues and store renewable energy. Copper (Cu), as an inexpensive and earth-abundant metal electrocatalyst, converts CO₂ into valuable chemicals and fuels, especially for C₂₊ products. This unique property of Cu is due to its appropriate adsorption of *CO intermediates and the subsequent C-C coupling. However, Cu catalysts are impeded by poor product selectivity and dynamically evolving structural motifs. In this work, we alloyed Cu with nickel (Ni) to promote C-C coupling and investigate the structural evolution during CO₂RR. We optimized the ratio between Cu and Ni for ethylene and ethanol production. Also, we observed the structural evolution of CuNi nanoparticles using identical location STEM and STEM-EDS.