Manganese dioxides with different exposed crystal plane supported on g-C3N4 for photocatalytic H2 evolution from water splitting. (15th October 2022)

• Record Type: Journal Article
• Authors: Liu, Xuecheng; Yan, Linjie; Hu, Xiting; Feng, Hongli; Guo, Bingke; Ha, Xia; Xu, Hui; Wang, Ruiqi; Tan, Xuemei; Huang, Hongyu
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 85(2022)
• Page Start: 36110
• Page End: 36117
• Publication Date: 2022-10-15
• Subjects: Photocatalytic hydrogen production -- G-C3N4 -- MnO2 -- Crystal plane; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.08.174
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A series of MnO2 /g-C3 N4 composites with different exposed crystal plane were successfully prepared by different synthesized method. UV–Vis, PL, ESR and electrochemical results suggest that the visible-light absorbance, photoexcited electron-separation efficiency and oxygen defects are greatly dependent on the exposed crystal-faceted MnO2 supported on g-C3 N4 . The experimental results display that the exposed crystal plane of MnO2 have great influences on the photocatalytic hydrogen evolution performance, and the m-MnOCN composite with exposed (111) crystal plane exhibits superior photocatalytic performance for the release of H2 under visible light irradiation, followed by the order of b-MnOCN [002]> p-MnOCN [110]. Moreover, Mechanism studies have shown that the possible mechanism of photocatalytic hydrogen evolution reaction is Z-scheme mechanism. Highlights: Photocatalytic hydrogen evolution performance of MnO2 /g-C3 N4 is enhanced with different exposed crystal plane. The m-MnOCN composite with exposed (111) crystal plane exhibits superior photocatalytic performance. The Z scheme mechanism is proposed for the photocatalytic hydrogen evolution mechanism of MnO2 /g-C3 N4 composite.