Enhanced visible-light-driven photocatalysis from WS2 quantum dots coupled to BiOCl nanosheets: synergistic effect and mechanism insight. Issue 1 (16th November 2017)

• Record Type: Journal Article
• Authors: Xiao, Peiyuan; Lou, Jufeng; Zhang, Huixian; Song, Weili; Wu, Xi-Lin; Lin, Hongjun; Chen, Jianrong; Liu, Shoujie; Wang, Xiangke
• Is Part Of: Catalysis science & technology. Volume 8:Issue 1(2018)
• Page Start: 201
• Page End: 209
• Publication Date: 2017-11-16
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c7cy01784g
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Novel 0D/2D heterojunctions of WS2 QDs/BiOCl exhibited enhanced visible-light driven photocatalytic activity. Abstract : Quantum dots (QDs) derived from two-dimensional (2D) nanosheets (NSs), especially ultrathin transition metal dichalcogenide (TMD, e.g. WS2, WSe2, MoS2, MoSe2 ) NSs, have attracted great attention due to their broad band absorption and high charge mobility. Herein, WS2 QDs, one of the emerging extraordinary zero-dimensional (0D) TMD materials, were applied to the preparation of novel 0D/2D heterojunctions of WS2 QDs/BiOCl nanosheets. The obtained WS2 /BiOCl composites exhibited significantly enhanced visible-light-driven photocatalytic activity as compared with pure BiOCl. The results indicated that the holes (h + ) and O2 ˙ − are the main active species generated by the catalysts under visible light irradiation. The enhanced photocatalytic performance could be due to the broad band absorption and up-conversion properties of the WS2 QDs as well as the band alignment and the strong coupling between the WS2 QDs and BiOCl NSs, leading to a broadened light absorption range and enhanced efficiency for electron–hole pair production and separation. These findings offer exciting opportunities using the extraordinary 2D TMD material-derived quantum dots for the fabrication of novel 0D/2D composites and may provide new insights into the application of the novel 0D/2D composites in catalysis.