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The coexistence of highly dispersed Pt2+ and Pt0 co-catalysts on chemically oxidized g–C3N4 via metal-support interaction: The effect of reduction time on Pt species and hydrogen evolution of Pt/g-C3N4 photocatalysts

Platinum (Pt) cocatalyst greatly enhances the photoactivity of the graphitic carbon nitride (g-C3N4) photocatalyst for photocatalytic H2 evolution where the Pt properties are critical to determine the photocatalytic activity. In this study, highly dispersed Pt was successfully loaded onto chemically...

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Bibliographic Details
Published in:Journal of alloys and compounds 2024-12, Vol.1007, p.176392, Article 176392
Main Authors: Nguyen, Phuong Anh, Dang, Thanh Truong, Tran, Van Tam, Dao, Duc Quang, Hoang, Thi Van Anh, Choi, Won Mook, Chung, Jin Suk, Shin, Eun Woo
Format: Article
Language:English
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Summary:Platinum (Pt) cocatalyst greatly enhances the photoactivity of the graphitic carbon nitride (g-C3N4) photocatalyst for photocatalytic H2 evolution where the Pt properties are critical to determine the photocatalytic activity. In this study, highly dispersed Pt was successfully loaded onto chemically oxidized g–C3N4 (OCN) via a hydrogen reduction process over different reduction time. OCN photocatalysts containing highly dispersed Pt2+/Pt0 exhibited outstanding charge separation efficiency and photocatalytic performance. Symmetrical –CO groups on the OCN surface specifically interacted with atomic Pt2+, and the Pt2+ atoms were stably reduced to Pt0 atoms along with the generation of –OH groups over time. The coexistence of Pt0 and Pt2+ promoted superior photocatalytic performance because the photoinduced charge transfer was facilitated by the Pt0 atoms, which was evidenced by the DFT calculation and the EIS, PL, and photocurrent response results. Consequently, after the 24 h reduction, the highly stable and active Pt2+/Pt0 atoms were effectively distributed over OCN, resulting in the highest HER activity at 4091.3 µmol g−1 h−1. [Display omitted] •Pt was loaded on chemically oxidized g-C3N4 by H2 reduction at different time periods.•Pt2+ and Pt0 atoms were desirably loaded via different metal-support interactions.•Pt2+ species specifically bonded with symmetrical –C=O groups on g-C3N4.•Coexistence of Pt0 and Pt2+ species on OCN-24 optimized charge transfer efficiency.•OCN-24 showed the highest H2 evolution rate at 4091.3 μmol g−1 h−1.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2024.176392