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
Source abstract
Abstract
Platinum (Pt) cocatalyst greatly enhances the photoactivity of the graphitic carbon nitride (g-CN) photocatalyst for photocatalytic H 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–CN (OCN) via a hydrogen reduction process over different reduction time. OCN photocatalysts containing highly dispersed Pt/Pt exhibited outstanding charge separation efficiency and photocatalytic performance. Symmetrical –C[dbnd]O groups on the OCN surface specifically interacted with atomic Pt, and the Pt atoms were stably reduced to Pt atoms along with the generation of –OH groups over time. The coexistence of Pt and Pt promoted superior photocatalytic performance because the photoinduced charge transfer was facilitated by the Pt 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 Pt/Pt atoms were effectively distributed over OCN, resulting in the highest HER activity at 4091.3 µmol g h.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Perovskite Materials and Applications · Advanced Nanomaterials in Catalysis
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