Xia Cheng, Guo Rui-Tang, Bi Zhe-Xu, Zhang Zhen-Rui, Li Chu-Fan, Pan Wei-Guo
College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China.
Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai, China.
Dalton Trans. 2023 Sep 19;52(36):12742-12754. doi: 10.1039/d3dt01969a.
In this research, a ternary Cu-CuTCPP/CuO/CoAl-LDH composite with a dual Z-scheme heterostructure was fabricated based on a CuO photocatalyst and applied in photocatalytic CO reduction. The physicochemical properties of the prepared catalysts and the possible reaction mechanism in CO reduction were analyzed and studied by various characterization methods. The activity of CO reduction significantly increased, especially forming C2 products. The optimal yield of CH and CH reached 1.56 and 1.92 μmol g h respectively, which was 14.45 and 17.45 times that from using the CuO monomer. In addition, the selectivity of C2 products reached 37.4%. The satisfactory C2 yield was mainly due to the fact that Cu(COO) nodes in Cu-CuTCPP contained adjacent Cu sites, which effectively promoted the C-C coupling reaction. Moreover, the dual Z-scheme heterojunction stimulated the separation of photogenerated electron-hole pairs and diminished the recombination rate. This work contributes to the development of novel photocatalysts with a dual Z-scheme heterojunction and facilitates the generation of valuable C2 products.
在本研究中，基于CuO光催化剂制备了具有双Z型异质结构的三元Cu-CuTCPP/CuO/CoAl-LDH复合材料，并将其应用于光催化CO还原。通过各种表征方法对制备的催化剂的物理化学性质以及CO还原中可能的反应机理进行了分析和研究。CO还原活性显著提高，尤其是C2产物的生成。CH4和C2H4的最佳产率分别达到1.56和1.92 μmol g-1 h-1，分别是使用CuO单体时的14.45倍和17.45倍。此外，C2产物的选择性达到37.4%。令人满意的C2产率主要是由于Cu-CuTCPP中的Cu(COO)节点含有相邻的Cu位点，这有效地促进了C-C偶联反应。此外，双Z型异质结促进了光生电子-空穴对的分离并降低了复合率。这项工作有助于开发具有双Z型异质结的新型光催化剂，并促进有价值的C2产物的生成。
