Copper (Cu) electrocatalysts for carbon dioxide reduction reaction (CORR) have attracted much attention due to their ability to produce high value-added C products (e.g., CH, CHOH, and n-propanol). However, achieving high selectivity of Cu electrocatalysts for CHOH in aqueous-based electrolytes remains a significant challenge. In this paper, we report Cu octahedra modified with low-coordinated Cu nanoclusters (Cu oct @Cu_NCs) as an efficient electrocatalyst for CORR to CHOH. Notably, the defect-site-rich Cu nanoclusters can promote the adsorption of *CO and increase the *CO coverage on Cu octahedra enclosed by Cu(111), thus promoting CORR to CHOH. We achieved a high Faradaic efficiency (FE) of 48.16 % for CHOH, and that of the C products is 83.31 % at −1.17 V vs. RHE. This study provides a surface nanostructured route for rationalizing efficient and selective copper electrocatalysts for CORR.

中文翻译：

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提高 Cu(1 1 1) 封闭的 Cu 八面体上 *CO 的覆盖率，以有效地将 CO2 电还原为 C2H5OH


用于二氧化碳还原反应（CORR）的铜（Cu）电催化剂因其能够产生高附加值的C产物（例如CH、CHOH和正丙醇）而备受关注。然而，在水基电解质中实现铜电催化剂对 CH3OH 的高选择性仍然是一个重大挑战。在本文中，我们报道了用低配位铜纳米团簇修饰的铜八面体（Cu oct @Cu_NCs）作为 CORR 转化为 CHOH 的有效电催化剂。值得注意的是，富含缺陷位点的Cu纳米团簇可以促进*CO的吸附，并增加Cu(111)包围的Cu八面体上*CO的覆盖率，从而促进CO2RR转化为CHOH。对于 CHOH，我们实现了 48.16% 的高法拉第效率 (FE)，而 C 产品在 -1.17V 与 RHE 条件下的法拉第效率为 83.31%。这项研究为合理化 CO2RR 高效选择性铜电催化剂提供了一条表面纳米结构途径。