Cu₂S_1−x hollow nanocubes with abundant and stable Cu^δ+ species are synthesized and achieve ethanol-selective electrosynthesis. The abundant Cu^δ+ sites have electron-donating ability, leading to the decrease of the reaction barrier in the potential-determining C−C coupling step and eventually making the applied potential close to the theoretical value.

中文翻译：

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通过工程丰富的供电子 Cuδ+ 物种在接近理论电势下将 CO2 电催化还原为乙醇

^{合成了具有丰富且稳定的Cu δ +}物质的Cu ₂ S _{1- x}中空纳米立方体，并实现了乙醇选择性电合成。丰富的 Cu ^{δ +}位点具有给电子能力，导致电位决定 C-C 耦合步骤中反应势垒的降低，最终使外加电位接近理论值。