Electroreduction of carbon dioxide (CO₂) into high value-added fuels and chemicals with excellent efficiency is an attractive but challenging route to alleviate energy crisis and environmental pollution. Here, the hollow Cu/CeO₂ nanotubes synthesized via the self-templated method display a high faradaic efficiency (FE) of 78.3% for the electrochemical reduction of CO₂ into ethylene (C₂H₄) in flow cell at a low applied potential of −0.7 V vs. RHE. The high reduction efficiency of Cu/CeO₂ nanotubes catalyst can be attributed to the synergistic effects from the formation of inseparable interface structure between Cu and CeO₂, which enhance the effective adsorption of intermediates. More importantly, the Cu/CeO₂ nanotubes catalyst also exhibits excellent performance (FE(C₂H₄) of 65.5%) in the solar-driven overall CO₂ splitting reaction with a conversion efficiency of 4.2%. The results demonstrate the rational regulation of metal-support interactions for improving electrocatalytic CO₂ reduction into multicarbon (C₂₊) products.

将二氧化碳 (CO ₂ )电还原为具有优异效率的高附加值燃料和化学品是缓解能源危机和环境污染的一种有吸引力但具有挑战性的途径。在此，通过自模板法合成的空心 Cu/CeO ₂纳米管在低外加电位下在流通池中将 CO ₂电化学还原为乙烯（C ₂ H ₄）时显示出 78.3% 的高法拉第效率（FE）-0.7 V 与 RHE。Cu/CeO ₂纳米管催化剂的高还原效率可归因于Cu和CeO ₂之间形成不可分离的界面结构的协同效应，从而增强了中间体的有效吸附。更重要的是，Cu/CeO ₂纳米管催化剂在太阳能驱动的整体CO ₂分解反应中也表现出优异的性能（FE(C ₂ H ₄ ) 为65.5%），转化效率为4.2%。结果证明了金属-载体相互作用的合理调节，以改善电催化 CO ₂还原为多碳 (C ₂₊ ) 产物。