Effective solar driven H2 production by Mn0.5Cd0.5Se/g-C3N4 S-scheme heterojunction photocatalysts. (16th September 2021)

• Record Type: Journal Article
• Authors: Chen, Yukai; Wang, Qian; Huang, Hengming; Kou, Jiahui; Lu, Chunhua; Xu, Zhongzi
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 64(2021)
• Page Start: 32514
• Page End: 32522
• Publication Date: 2021-09-16
• Subjects: Photocatalysis -- Heterojunction -- Mn0.5Cd0.5Se -- g-C3N4 -- Nanoparticle; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.07.106
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Photocatalytic technology offers a practical way to solve the energy crisis by producing hydrogen under sunlight but its performance is encumbered by the fast recombination of photoinduced electron-hole pairs. Constructing heterojunctions to form built-in electric fields could separate these electrons and holes, finally enhancing the photocatalytic efficiency. Herein, a Mn0.5 Cd0.5 Se/g-C3 N4 (MCS/CN) heterojunction was fabricated by a facile method to tap into this advantage. 2%MCS/CN shows a hydrogen evolution rate of up to 354.5 μmol in 3 h, which is 4.49 and 126.6 times that of pure g-C3 N4 and Mn0.5 Cd0.5 Se, respectively. Its photocatalytic stability is proved by six cycling tests. Photocurrent, EIS, along with PL spectra, prove that the recombination of photoinduced electron-hole pairs is inhibited by constructing a heterojunction between Mn0.5 Cd0.5 Se and g-C3 N4 . In summary, this work demonstrates the enhancement of photocatalysis by constructing a S-scheme heterojunction and offers a feasible way to develop other effective photocatalysts. Highlights: Mn0.5 Cd0.5 Se/g-C3 N4 S-scheme heterojunction was constructed by a facile solvothermal method. Photocatalytic performance was enhanced greatly by fast carrier separation. The nanosheets-nanoparticles heterojunction provides a general avenue to design other photocatalysts.