To improve the electrocatalytic conversion of carbon dioxide (CO₂) into C₂₊ products (such as ethylene (C₂H₄) and ethanol (CH₃CH₂OH), etc.) is of great importance, but remains challenging. Herein, we proposed a strategy that directs the C-C coupling pathway through enriching and confining the carbon monoxide (CO) intermediate to internal pores of Cu nanocubes, for electrocatalytic reduction of CO₂ into C₂₊ chemicals. In H-type cell, the Faraday efficiency (FE) for ethylene and ethanol reaches 70.3% at −1.28 V versus the reversible hydrogen electrode (vs. RHE), with a current density of 47.9 mA·cm⁻². In flow cell, the total current density is up to 340.3 mA·cm⁻² at −2.38 V (vs. RHE) and the FE for C₂₊ products is 67.4%. Experimental and theoretical studies reveal that both the CO intermediate adsorption and C-C coupling reaction on such an internal porous catalyst are facilitated, thus improving CO₂-to-C₂₊ conversion efficiency.

提高二氧化碳（CO ₂）电催化转化为C ₂₊产物（如乙烯（C ₂ H ₄）和乙醇（CH ₃ CH ₂ OH）等）非常重要，但仍然具有挑战性。在此，我们提出了一种策略，通过将一氧化碳（CO）中间体富集并限制在Cu纳米立方体的内部孔中来引导CC偶联途径，以将CO 2 电催化还原为C ₂₊化学_品。在H型电池中，相对于可逆氢电极（vs. RHE），乙烯和乙醇的法拉第效率（FE）在-1.28 V时达到70.3%，电流密度为47.9 mA·cm ^-2。在流通池中，在-2.38 V（相对于RHE）下总电流密度高达340.3 mA·cm ^-2并且C ₂₊产物的FE为67.4%。实验和理论研究表明，这种内部多孔催化剂上的CO中间体吸附和CC偶联反应均得到促进，从而提高了CO ₂ -到C ₂₊的转化效率。