Synthesis of novel CoxMo1-xS-Cd0.5Zn0.5S composites with significantly improved photocatalytic hydrogen evolution performance under visible-light illumination
Synthesis of novel CoxMo1-xS-Cd0.5Zn0.5S composites with significantly improved photocatalytic hydrogen evolution performance under visible-light illumination
复制标题
新型CoxMo1-xS-Cd0.5Zn0.5S复合材料的合成，在可见光照射下光催化析氢性能显着提高
DOI：
10.1016/j.ijhydene.2019.02.018
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发表时间：
2019
影响因子：
7.2
通讯作者：
Ge Lei
中科院分区：
文献类型：
--
作者：
Wang Aixia;Dai Dongsheng;Li Songsong;Xiao Nan;Xu Boran;Gao Yangqin;Ge Lei
近年来，人们发现MoS 2与Co2+（或Ni 2+）的复合能更有效地提高半导体材料的光催化性能。在这项研究中，新型CoxMo 1-xS有效地沉积在Zn 0. 5Cd 0. 5S半导体表面作为一个有效的促进剂，使用原位水热过程。采用XRD、TEM、DRS、XPS、PL和TRPL等技术对CoxMo 1-xS-Zn 0. 5Cd 0.5S复合材料进行了表征。通过添加廉价的CoxMo 1-xS作为促进剂，可显著提高Zn 0.5Cd 0.5S的可见光催化析氢性能。摩尔量为10%的CoxMo 1-xS-Zn 0. 5Cd 0.5S混合样品表现出最佳的催化性能，在可见光下的同系氢生成速率为188.65 μmol h-1，估计是未改性Zn0.5Cd0.5S样品的14.5倍。在420 nm单色光下测得Co_（0.3）Mo_（0.7）单键Zn_（0.5）Cd_（0.5）S样品的表观量子产率为16.72%。实验结果表明，CoxMo（1-x）S与Zn（0. 5）Cd（0. 5）S之间的协同作用明显促进了杂化样品中光生载流子的迁移.提出了CoxMo_（1-x）S促进剂提高光催化性能的合理催化机理，并通过TRPL测试进行了验证，为设计具有良好光催化性能的理想半导体材料提供了新的思路。
Recently, MoS2incorporates with Co2+(or Ni2+) was found to increase the photocatalytic performance of semiconducting materials more effectively. In this study, novel CoxMo1-xS was effectively deposited on the surface of Zn0.5Cd0.5S semiconductors as an efficient promotor using in-situ hydrothermal process. The as-prepared CoxMo1-xS-Zn0.5Cd0.5S composites are examined by the following techniques: XRD, TEM, DRS, XPS, PL and TRPL. The photocatalytic hydrogen evolution performance under visible illumination over Zn0.5Cd0.5S is remarkably increased by adding cheap CoxMo1-xS as promotor. The CoxMo1-xS-Zn0.5Cd0.5S hybrid specimen with 10% molar amount illustrates the best catalytic performance with a homologous hydrogen generation rate of 188.65 μmol h−1, which is estimated to be 14.5 folds than that of unmodified Zn0.5Cd0.5S specimen in the presence of visible light. The apparent quantum yield of Co0.3Mo0.7single bondZn0.5Cd0.5S sample is determined to be 16.72% at monochromatic light of 420 nm. The experimental outcomes indicate that the synergistic action between CoxMo1-xS and Zn0.5Cd0.5S obviously promotes transfer of photo-induced charge carriers in the hybrid sample. A reasonable catalytic mechanism for the increased photocatalytic performance of CoxMo1-xS promotor was presented and authenticated by TRPL measure, which would present a new notion for the design of ideal semiconductors with plummy photocatalytic capability.