2D co-catalytic MoS2 nanosheets embedded with 1D TiO2 nanoparticles for enhancing photocatalytic activity. (19th July 2016)

• Record Type: Journal Article
• Authors: Ren, Xiaohui; Qi, Xiang; Shen, Yongzhen; Xiao, Si; Xu, Guanghua; Zhang, Zhen; Huang, Zongyu; Zhong, Jianxin
• Is Part Of: Journal of physics. Volume 49:Number 31(2016)
• Publication Date: 2016-07-19
• Subjects: MoS2 -- photocatalysis -- co-catalyst; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/31/315304
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: 2D photocatalytic TiO2 /MoS2 hybrid nanosheets (HNs) have been prepared via a facile hydrothermal process. X-ray diffraction patterns and Raman spectra are carried out and confirm a well crystalized anatase and 2H-MoS2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating the relatively stability of the MoS2 nanosheet platform with a high specific surface area. UV–vis spectra and electrochemical impedance spectra exhibit an enhanced light absorption ability and conductivity of TiO2 /MoS2 compared to that of just TiO2 . Photoelectrochemical (PEC) tests also demonstrate the photocurrent of 20 : 1 TiO2 /MoS2 HNs is greatly improved compared to that of as-prepared TiO2 . The saturation current density is about 33 µ A cm −2 when the applied potential is 0.2 V, which is nearly twice that of pure TiO2 and four times as high as 5 : 1 TiO2 /MoS2 HNs and 1 : 1 TiO2 /MoS2 HNs. Besides that, the duration test exhibits no detectable distinction after processing 25 cycles. The improved photocatalytic activities are perhaps derived from the high conductivity and the increased active sites for the introduction of co-catalytic MoS2 nanosheets as well as the positive synergetic effect between the TiO2 and MoS2 . This work demonstrates that the as-prepared TiO2 /MoS2 HNs may have a great potential application in PEC hydrogen production.