Fabrication of a Concave Cubic Z-Scheme ZnIn<sub>2</sub>S<sub>4</sub>/Cu<sub>2</sub>O Heterojunction with Superior Light-Driven CO<sub>2</sub> Reduction Performance
Zhe‐xu Bi, Rui‐tang Guo, Xing Hu, Juan Wang, Xin Chen, Weiguo Pan
Abstract
The photocatalytic CO 2 reduction technology can effectively decrease the CO 2 content in air while converting CO 2 into high-value-added chemicals and turning waste into treasure. In this study, Cu 2 O with a concave cubic structure was fabricated by selective etching, and ZnIn 2 S 4 nanosheets were successfully loaded on it uniformly, which significantly elevated its catalytic activity. The maximum CO yield of 9.98 μmol/g/h was obtained on the Z-scheme ZIS/Cu 2 O-0.3 photocatalyst, which was 3.7 and 4.3 times as high as the bare Cu 2 O concave cube and ZnIn 2 S 4, respectively. The excellent photocatalytic performance could be attributed to the construction of Z-scheme heterojunction which facilitated the efficient separation of electron–hole pairs, a large specific surface area that provided an abundance of reactive sites, and positive visible light response.