Light-assisted synthesis MoSx as a noble metal free cocatalyst formed heterojunction CdS/Co3O4 photocatalyst for visible light harvesting and spatial charge separation. Issue 20 (8th May 2018)

• Record Type: Journal Article
• Authors: Yang, Hao; Jin, Zhiliang; Wang, Guorong; Liu, Duanduan; Fan, Kai
• Is Part Of: Dalton transactions. Volume 47:Issue 20(2018)
• Page Start: 6973
• Page End: 6985
• Publication Date: 2018-05-08
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt01142g
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : In this paper, a novel photocatalyst with visible light harvesting and spatial charge separation is reported, in which cobalt oxide and molybdenum sulfide are assembled on the surface of cadmium sulfide nanorods. Abstract : In this paper, a novel photocatalyst with visible light harvesting and spatial charge separation is reported, in which cobalt oxide (acting as a hole trap) and molybdenum sulfide (acting as an electron trap) are assembled on the surface of cadmium sulfide nanorods. The MoS x /CdS/Co3 O4 composite photocatalyst shows a high H2 evolution with a yield of 537.51 μmol in 5 h, which is 35.53 times greater than over pristine CdS (15.13 μmol). The detailed underlying reason was comprehensively studied and understood by means of SEM, TEM, XRD, XPS, UV-vis DRS, BET; in particular, investigation of their photoelectrochemical properties with photocurrent, voltammetric scanning, fluorescence spectra etc . The high photocurrent response, the lower overpotential (−0.37 V vs. SCE), the faster electron transfer rate constant ( k et = 4.23 × 10 9 s −1 ) and the short fluorescence lifetime (0.457 ns) supported the efficient spatial charge transfer between CdS and MoS x as well as Co3 O4 . The simultaneous loading of bicocatalysts can significantly improve the photo-induced spatial charge separation of CdS because MoS x nanoparticles act as an electron trap to rapidly transfer electrons from CdS while Co3 O4 acts as a hole trap to quickly transfer holes, enhancing its photocatalytic performance as well.