Surface oxygen vacancy facilitated Z-scheme MoS2/Bi2O3 heterojunction for enhanced visible-light driven photocatalysis-pollutant degradation and hydrogen production. (31st July 2020)

• Record Type: Journal Article
• Authors: Goud, Burragoni Sravanthi; Koyyada, Ganesh; Jung, Jae Hak; Reddy, Gutturu Rajasekhara; Shim, Jaesool; Nam, Nguyen Dang; Vattikuti, S.V. Prabhakar
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 38(2020)
• Page Start: 18961
• Page End: 18975
• Publication Date: 2020-07-31
• Subjects: Layered material -- Nanocomposite -- H2 production -- Solar energy -- Z-Scheme; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.05.073
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: An oxygen-vacancy rich, bismuth oxide (Bi2 O3 ) based MoS2 /Bi2 O3 Z-scheme heterojunction catalyst (2-BO-MS) was prepared in an autoclave hydrothermal method using ethanol and water. The performance of MoS2 /Bi2 O3 catalyst was examined for photocatalytic hydrogen evolution, photoelectrochemical activity, and crystal violet (CV) dye degradation by comparing with pristine Bi2 O3 and MoS2 . The hydrogen evolution performances of 2-BO-MS catalyst exhibited 3075.21 μmol g −1 h −1, which is 7.18 times higher than that of MoS2 (428.14 μmol g −1 h −1 ). The XPS, XRD and HRTEM analyses covered that the superior photocatalytic performance of 2-BO-MS catalyst might have stemmed out due to the existence of oxygen vacancies, enhanced strong interfacial interaction between MoS2 and Bi2 O3 and specific surface area. The in-depth investigation has been performed for MoS2 /Bi2 O3 Z-scheme heterojunction using several characterization techniques. Moreover, the photocatalytic mechanism for hydrogen evolution and photodegradation were proposed based on trapping experiment results. This results acquired using MoS2 /Bi2 O3 Z-scheme heterojunction would be stepping stone for developing heterojunction catalyst towards attaining outstanding photocatalytic activity. Graphical abstract: Image 1 Highlights: OD/2D binary heterostructure of Bi2 O3 /MoS2 was synthesized via one-pot approach. Bi2 O3 /MoS2 exhibited higher H2 evolution rate under solar light. Bi2 O3 /MoS2 demonstrated remarkable photo/electrochemical behaviour. Z-Scheme photocatalytic activity of Bi2 O3 /MoS2 was elucidated and discussed.