The activity and selectivity of electrocatalytic CO₂ reduction (CO₂R) is strongly dependent on the structure of the catalyst. Structural engineering is always at the heart of preparing the high-performance catalysts. Herein, mixed copper oxide catalysts were prepared by a hydrothermal method, which consisted of Cu₄O₃, CuO and Cu₂O. The potential cycling of this Cu oxide catalyst in 1 M KHCO₃ electrolyte resulted in metallic state of smaller particles and Cu nanowires, as manifested by scanning electron microscopy and X-ray diffraction. The catalytic performance of the restructured Cu catalysts towards two carbon products in CO₂R were much enhanced compared to the pristine catalyst, as explored in flow cell reactor on gas diffusion electrode. In 1 M KOH solution, the Faradaic efficiency of two-carbon products is 34.1 % at –0.8 V vs. reversible hydrogen electrode, and the partial current density reaches 80 mA/cm² on gas diffusion electrode.

电催化CO ₂还原 (CO ₂ R)的活性和选择性在很大程度上取决于催化剂的结构。结构工程始终是制备高性能催化剂的核心。在本文中，混合氧化铜催化剂是通过水热法制备的，由 Cu ₄ O ₃、CuO 和 Cu ₂ O 组成。这种 Cu 氧化物催化剂在 1 M KHCO ₃电解质中的电位循环导致较小颗粒和 Cu 的金属态纳米线，如扫描电子显微镜和 X 射线衍射所示。重组Cu催化剂对CO _{2 中}两种碳产物的催化性能正如在气体扩散电极上的流动池反应器中所探索的那样，与原始催化剂相比，R 大大增强。在 1 M KOH 溶液中，双碳产物的法拉第效率在 –0.8 V 时与可逆氢电极相比为 34.1 %，在气体扩散电极上的部分电流密度达到 80 mA/cm ²。