Construction of 2D all-solid-state Z-scheme g-C3N4/BiOI/RGO hybrid structure immobilized on Ni foam for CO2 reduction and pollutant degradation. (February 2020)

• Record Type: Journal Article
• Authors: Hu, Xiaofeng; Hu, Jisong; Peng, Qingqi; Ma, Xinguo; Dong, Shijie; Wang, Huihu
• Is Part Of: Materials research bulletin. Volume 122(2020)
• Publication Date: 2020-02
• Subjects: Z-scheme -- Photocatalysis -- g-C3N4 -- BiOI -- RGO; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2019.110682
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: A special Z-scheme hybrid structure with 2D configuration comprising of g-C3 N4, reduced graphene oxide (RGO), and BiOI (g-C3 N4 /BiOI/RGO) was rationally constructed and immobilized on Ni foam with RGO functioned as electron transfer mediator and binder. Highlights: Ternary 2D g-C3 N4 /BiOI/RGO hybrid immobilized on Ni foam was successfully built. RGO functioned as electron transfer mediator and binder. Hybrid immobilized on Ni foam displayed an excellent photocatalytic performance. Electron transfer route of hybrid conformed to the Z-scheme mechanism. Abstract: In this work, a special hybrid structure with 2D configuration comprising of g-C3 N4, reduced graphene oxide (RGO), and BiOI (g-C3 N4 /BiOI/RGO) was rationally constructed and immobilized on Ni foam with RGO functioned as electron transfer mediator and binder. The immobilized 2D g-C3 N4 /BiOI/RGO hybrid structure exhibited the enhanced photocatalytic CO2 reduction to CO and the methyl orange (MO) degradation efficiency under visible light irradiation. Particularly, the hybrid heterojunction with a mass ratio 6% of BiOI to g-C3 N4 displayed the highest CO yield and degradation rate constant for MO, which was 1.6 times and 3 times of g-C3 N4 /RGO binary heterojunction immobilized on Ni foam. The enhanced photocatalytic activity was ascribed to the rapid charge separation. More importantly, combined with the theoretical calculations on the work functions of g-C3 N4, rGO and BiOI, the experimental results clarified the charges transfer route of g-C3 N4 /BiOI/RGO heterojunction conforming to the Z-scheme mechanism.