在铜基催化剂表面构建Cu0/Cu+界面有利于电催化CO2还原（CO2RR）为多碳（C2+）产物。然而，在高电流密度下，Cu+物种很容易被还原成金属Cu。因此，深入理解并合理设计和构建Cu基催化剂表面Cu0/Cu+界面对提高C2+产物选择性具有重要的意义。
近日，华东理工大学李春忠教授和李会会研究员等人在Science China Materials发表研究论文，提出了一种可控的“纳米粒子组装”策略，以获得由大量Cu2O纳米粒子组成的中空球形组装体（HSA-Cu2O），提高了CO2RR的C2+选择性。
本文要点
1) HSA-Cu2O催化剂显著提高了C2+产物的选择性，其法拉第效率（FE）达到了79.2% ± 0.7%，C2+产物的部分电流密度为317.1 mA cm−2。2) 在CO2RR过程中，HSA-Cu2O催化剂发生了原位电化学重构，实现了高密度的Cu0/Cu+活性界面位点的构建。3) 俄歇电子能谱、原位拉曼和结构演变过程研究证实，Cu0/Cu+界面与中空球限域结构的结合促进了*CO中间体的富集，从而促进了*CO二聚化，提高了CO2RR中C2+产物的选择性。Figure 1. Preparation and characterization of as-prepared and pre-reduced HSA-Cu2O catalysts. (a) Schematic illustration of the fabrication procedure of as-prepared HSA-Cu2O. (b, c) SEM image and XRD pattern of as-prepared HSA-Cu2O. (d, e) HRTEM images of pre-reduced HSA-Cu2O. (f) HAADF-STEM image and corresponding EDX elemental mappings of Cu, C, O of pre-reduced HSA-Cu2O.Figure 2. Electrochemical CO2RR performance. (a) LSV curves of three Cu2O catalysts. (b) FE of various products of HSA-Cu2O catalysts at different current densities. (c) FE of C2+ products and (d) the ratio of FEC2+/FEC1 of the three catalysts. (e) Stability test of HSA-Cu2O catalysts throughout 30 h of CO2 electrolysis at −4.4 V.Figure 3. Structure characterization of the HSA-Cu2O after CO2RR. (a) SEM image. (b) TEM image. (c) HAADF-STEM image and corresponding EDX elemental mappings. (d, e) HRTEM images.Figure 4. Auger spectra of Cu LMM of the three catalysts after CO2RR. (a) HSA-Cu2O, (b) S-Cu2O, (c) Com-Cu2O. (d, e) In-situ Raman spectra of HSA-Cu2O catalysts at potential range from −0.09 to −0.69 V vs. RHE. (f) In-situ XRD patterns of the HSA-Cu2O catalysts at the OCP and −2.3V vs. RHE.Yu Li, Haojun Shi, Congcong Li, Zhongliang Liu, Weizheng Tang, Tingting Zhang, Shixin Yin, Huihui Li, Chunzhong Li. Shaping hollow spherical assemblies for enhanced Cu0/Cu+ interface to boost C2+ selectivity in CO2 electroreduction. Sci. China Mater. (2024).https://doi.org/10.1007/s40843-024-3057-1
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