Cu₂O is promising to catalytically convert CO₂ into C₂ products by overcoming the instability and slow multi-electron transfer. Regulating catalytic construction and interface microenvironment is challenging to stabilize Cu₂O and selectively convert CO₂ to C₂₊ hydrocarbons. A photocatalyst (Cu₂O@Cu-CN) of oxygen vacancy–rich Cu₂O@Cu symbiont embedded in N-doped carbon skeleton is achieved by ligand competition strategy. The Schottky junction and the hydrophobic microenvironment in the catalyst together stabilize the active site against the Cu₂O redox reaction. The hydrophobic interface can make the catalyst favorable for trapping CO₂. The asymmetric interface with oxygen vacancy can enhance the adsorption and activation of CO₂ and *CO, thus reducing the energy barrier for the formation of *OCCO intermediates and promoting the coupling conversion of *OCCO to C₂H₄. The C₂H₄ evolution rate reaches 46.27 μmol_C2H4 g_cat^-1 h^-1 with a high selectivity of 40.3% using triethanolamine (TEOA) as a sacrificial agent, and the apparent quantum yield (AQY) is as high as 14.41% (λ = 420 nm). The C₂H₄ evolution rate is 2.10 μmol_C2H4 g_cat^-1 h^-1 in water without TEOA. Moreover, the productive rate of C₂H₄ still maintains 95.37% after lasting 20 h, showing a robust long−term stability.

Cu ₂ O有望通过克服不稳定性和缓慢的多电子转移将CO ₂催化转化为C _2产物。调节催化结构和界面微环境对于稳定 Cu ₂ O 和选择性地将 CO ₂转化为 C ₂₊烃具有挑战性。通过配体竞争策略实现了嵌入N掺杂碳骨架中的富含氧空位的Cu ₂ O@Cu共生体的光催化剂（Cu _{2 O@Cu-CN）。}催化剂中的肖特基结和疏水性微环境共同稳定了活性位点对抗 Cu ₂O 氧化还原反应。疏水界面可以使催化剂有利于捕获CO ₂。具有氧空位的不对称界面可以增强CO ₂和*CO的吸附和活化，从而降低*OCCO中间体形成的能垒，促进*OCCO耦合转化为C ₂ H ₄。以三乙醇胺（TEOA）为牺牲剂， C ₂ H ₄析出速率达到46.27 μmol _C2H4 g _cat ^-1 h ^-1，选择性高达40.3%，表观量子产率（AQY）高达14.41%（ λ = 420 纳米）。C ₂ H ₄在没有 TEOA 的水中释放速率为 2.10 μmol _C2H4 g _cat ^-1 h ^-1。_{此外，C 2} H ₄的产率在持续 20 h 后仍保持在 95.37%，表现出较强的长期稳定性。