Fabrication of direct Z-scheme heterojunction between Zn0.5Cd0.5S and N-rich graphite carbon nitride for boosted H2 production. (3rd September 2020)

• Record Type: Journal Article
• Authors: Jin, Zhanbin; Wei, Tingting; Huang, Jiayu; Li, Fengyan; Yang, Yi; Xu, Lin
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 43(2020)
• Page Start: 22711
• Page End: 22721
• Publication Date: 2020-09-03
• Subjects: Photocatalytic H2 evolution -- Zn0.5Cd0.5S -- C3N5 -- Solid solution -- Visible light; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.093
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, a novel direct Z-scheme g-C3 N5 /Zn0.5 Cd0.5 S (CN/ZCS) heterojunction was successfully synthesized. Furthermore, its photocatalytic activity for hydrogen production was also investigated, whose photoluminescence spectrum revealed the charge transfer procedure of g-C3 N5 and ZCS. Moreover, the optimized hydrogen production rate of ZCS with 15 wt% of g-C3 N5 (15% CN/ZCS) was about 142.8 mmol/h/g and quantum efficiency (Q.E.) was circa 33.7% under 420 nm monochromatic light. Compared with the pure ZCS and ZCS with 2 wt% of Pt, the 15% CN/ZCS composite exhibited considerable improved hydrogen production rate, which was about 20 times and 7 times, respectively. The formation of CN/ZCS composite resulted in faster separation of the photogenerated electron-hole pairs. Our work may supply valuable data for the application of g-C3 N5 on photocatalysis. Graphical abstract: The direct Z-scheme heterojunction of C3 N5 /Zn0.5 Cd0.5 S (ZCS) promotes the separation of the photo-generated electron-hole pairs. The photocatalytic hydrogen production rate of 15% C3 N5 /ZCS is about 142.8 mmol/h/g which is about 20 times than pure ZCS and the Q.E. is about 33.7% at 420 nm in 0.35 M Na2 S/0.25 M Na2 SO3 . Image 1 Highlights: Direct Z-scheme heterojunction between Zn0.5 Cd0.5 S and g-C3 N5 has been fabricated. The photocatalytic H2 production rate of 15% C3 N5 /ZCS is about 142.8 mmol/h/g. The preliminary mechanism of the photogenerated electron transfer was proposed.