0D/2D nanocomposite visible light photocatalyst for highly stable and efficient hydrogen generation via recrystallization of CdS on MoS2 nanosheets. (September 2016)

• Record Type: Journal Article
• Authors: Ma, Fukun; Wu, Yongzhong; Shao, Yongliang; Zhong, Yueyao; Lv, Jiaxin; Hao, Xiaopeng
• Is Part Of: Nano energy. Volume 27(2016:Sep.)
• Page Start: 466
• Page End: 474
• Publication Date: 2016-09
• Subjects: Photocorrosion -- CdS nanoparticles -- Recrystallization process -- MoS2 nanosheets -- Photocatalyst; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.07.014
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: CdS systems represent promising photocatalysts for hydrogen generation; however, these systems are seriously restricted by inherent issues with photocorrosion. Here, the CdS photocorrosion process is prevented and a high stable and effective photocatalyst is obtained in the novel 0D/2D CdS/MoS2 nanosheet composite system. According to crystallization kinetics, the CdS photocorrosion process will be prevented if the S elements resulting from photocorrosion can be reduced back to S 2− in the same photocatalytic system. So a photocorrosion-recrystallization strategy is proposed for the first time to resolve issues with photocorrosion when using CdS photocatalysts. Meanwhile, the recrystallized 0D/2D CdS/MoS2 nanocomposite produces a high quantum efficiency of 23.03% (λex =420 nm), the evolution of hydrogen presents no notable activity losses for up to 400 h. Thus, the approach demonstrated here represents a promising method of designing and fabricating more stable and efficient composite chalcogenide photocatalysts. Graphical abstract: A photocorrosion-recrystallization strategy is proposed to improve photocatalytic performances and resolve issues with photocorrosion for CdS photocatalysts. The obtained CdS/MoS2 nanocomposite shows highly efficient and stable photocatalytic activity for hydrogen generation. Highlights: The photocorrosion of CdS is prevented in the 0D/2D CdS/MoS2 nanosheet system. A photocorrosion-recrystallization strategy is proposed to resolve photocorrosion. The as-obtained nanocomposite shows stable and efficient photocatalytic activity. The recrystallization is verified by the mixtures of CdS with MoS2 or WS2 nanosheets.