Efficient spatial charge separation in unique 2D tandem heterojunction CdxZn1−xIn2S4–CdS–MoS2 rendering highly-promoted visible-light-induced H2 generation. Issue 1 (15th December 2020)

• Record Type: Journal Article
• Authors: Wu, Jiakun; Sun, Bowen; Wang, Hui; Li, Yanyan; Zuo, Ying; Wang, Wenjing; Lin, Haifeng; Li, Shaoxiang; Wang, Lei
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 1(2021)
• Page Start: 482
• Page End: 491
• Publication Date: 2020-12-15
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta10564c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Unique 2D heterostructures Cd x Zn1− x In2 S4 –CdS–MoS2 with effective charge separation, excellent light-harvest, and abundant active sites are highly-efficient for photocatalytic H2 evolution. Abstract : Two-dimensional (2D) semiconductor nanostructures have exhibited great prospect as an efficient photocatalyst for solar-to-fuel application. In this work, a unique 2D tandem heterojunction consisting of ultrathin Cd x Zn1− x In2 S4 nanosheets coupled with rectangular CdS flakes and defect-rich MoS2 few-layered nanosheets was constructed for the first time. Remarkably, the efficient electron transfer channels present in the CdS/Cd x Zn1− x In2 S4 and Cd x Zn1− x In2 S4 /MoS2 2D tandem heterojunctions facilitate the spatial separation and directional migration of photo-induced charge carriers effectively. Moreover, such 2D tandem heterojunction Cd x Zn1− x In2 S4 –CdS–MoS2 is provided with excellent light harvesting capacity and abundant HER active sites from the defective MoS2 co-catalyst. These distinct advantages endow the optimized C0.15 ZIS–5C–3M hybrid (5 wt% CdS, 3 wt% MoS2 ) with an exceptional photocatalytic H2 evolution reaction (HER) activity of 27.14 mmol h −1 g −1, approximately 47 times that of pure ZnIn2 S4 and it is much superior to that of Pt-decorated C0.15 ZIS–5C and most ZnIn2 S4 -based composites reported previously. A high HER apparent quantum yield (AQY) of 19.97% is achieved at λ = 400 nm. In addition, both the cycling and long-term HER measurements evidence the prominent stability of C0.15 ZIS–5C–3M for H2 production. The results indicated here could pave the way for the exploitation of new 2D heterostructures toward highly-efficient solar conversion and utilization.