Jiang Haopeng, Xu Mengyang, Zhao Xiaoxue, Wang Huijie, Liu Qi, Liu Zhi, Liu Qinqin, Yang Guoyu, Huo Pengwei
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China.
Inorg Chem. 2022 Jul 25;61(29):11207-11217. doi: 10.1021/acs.inorgchem.2c01216. Epub 2022 Jul 14.
Photocatalytic CO reduction technology is of great importance to alleviate energy crisis and environmental pollution; however, it remains a serious challenge due to the fast recombination of carriers. In this study, we report a three-dimensional structure of a ZnInS/Au/CdS composite photocatalyst for the CO reduction reaction, where Au nanoparticles (NPs) are evenly anchored on the surface of ZnInS by photodeposition and Au NPs are wrapped around by CdS. In ZnInS/Au/CdS composite photocatalysts, Au NPs act as a bridge to construct a "semiconductor-metal-semiconductor" tandem electron transfer mechanism (ZnInS → Au → CdS) heterojunction, which greatly promotes the transfer of photogenerated electrons. It is worth noting that Au NPs, as a local surface plasmon resonance (LSPR) effect excited source to generate excited-state electrons, further improve the photoreduction CO activity. Under UV-vis light irradiation, the CO yield of ZnInS/Au/CdS can reach 63.07 μmol·g·h, which is higher than that of 6.37 μmol·g·h for pure ZnInS, 0.93 μmol·g·h for CdS, 8.9 μmol·g·h for ZnInS/CdS, 31.04 μmol·g·h for ZnInS/Au, and 5.37 μmol·g·h for CdS/Au. In addition, the ternary ZnInS/Au/CdS composite photocatalyst has good cyclic stability. This study broadens the idea of designing photocatalysts with good carrier separation efficiency.
光催化CO还原技术对于缓解能源危机和环境污染具有重要意义；然而，由于载流子的快速复合，它仍然是一个严峻的挑战。在本研究中，我们报道了一种用于CO还原反应的ZnInS/Au/CdS复合光催化剂的三维结构，其中Au纳米颗粒（NPs）通过光沉积均匀地锚定在ZnInS表面，并且Au NPs被CdS包裹。在ZnInS/Au/CdS复合光催化剂中，Au NPs作为桥梁构建了一种“半导体-金属-半导体”串联电子转移机制（ZnInS→Au→CdS）异质结，这极大地促进了光生电子的转移。值得注意的是，Au NPs作为产生激发态电子的局域表面等离子体共振（LSPR）效应激发源，进一步提高了光还原CO的活性。在紫外-可见光照射下，ZnInS/Au/CdS的CO产率可达63.07 μmol·g·h，高于纯ZnInS的6.37 μmol·g·h、CdS的0.93 μmol·g·h、ZnInS/CdS的8.9 μmol·g·h、ZnInS/Au的31.04 μmol·g·h以及CdS/Au的5.37 μmol·g·h。此外，三元ZnInS/Au/CdS复合光催化剂具有良好的循环稳定性。本研究拓宽了设计具有良好载流子分离效率的光催化剂的思路。
