A novel CoSeO3 photocatalyst assisting g-C3N4 in enhancing hydrogen evolution through Z scheme mode. (29th January 2022)

• Record Type: Journal Article
• Authors: Feng, Ting; Jin, Jingyi; Cao, Yanren; Li, Haiyan; Dong, Bohua; Cao, Lixin
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 9(2022)
• Page Start: 5999
• Page End: 6010
• Publication Date: 2022-01-29
• Subjects: CoSeO3 -- Direct Z scheme -- g-C3N4 -- Photo-induced carriers -- Photocatalytic H2 evolution; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.11.242
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel CoSeO3 /g-C3 N4 composite photocatalyst with Z-scheme heterostructure is constructed through electrostatic self-assembly to be utilized in photocatalytic hydrogen evolution. The optimal photocatalytic H2 evolution rate of CoSeO3 /g-C3 N4 hybrids and apparent quantum yield (AQY) have raised about 65.4 times under full light irradiation with no noble metal cocatalyst loading than that of pure g-C3 N4 . The CoSeO3 semiconductor is firstly prepared for assisting to elevate the photocatalytic hydrogen evolution activity. After combining with g-C3 N4, CoSeO3 /g-C3 N4 hybrids with a sheet-sheet structure enhance the contact area with water and broaden the light absorption region as well as reduce transfer resistance of carriers. Moreover, the photo generated carriers possess a typical direct Z scheme transmission, which decreases the recombination of electrons and holes. This work offers a new choice for constructing a Z scheme heterostructure to apply in photocatalytic water reduction, and offers a deep view to explain the elevated photocatalytic activity. Graphical abstract: This work firstly provides a novel CoSeO3 photocatalyst for establishing the g-C3 N4 -based Z scheme heterostructure in H2 evolution and researches the active species (e - ) during the reaction, which could put forward a deeper understanding of rational mechanism and inspire the subsequent exploration in constructing heterostructures for enhancing photocatalytic water splitting performance. Image 1 Highlights: CoSeO3 photocatalyst was the first time to apply in photocatalytic H2 production. A CoSeO3 /g-C3 N4 heterostructure was prepared by electrostatic self-assembly. The optimal photocatalytic H2 evolution rate of 20%Co/G is 1459.2 μmol g −1 h −1 . The Co/G Z scheme heterostructure elevates the separation of photo-induced charges.