Article Dans Une Revue Angewandte Chemie International Edition Année : 2025

Single‐Atom Catalysts on C 3 N 4 : Minimizing Single Atom Pt Loading for Maximized Photocatalytic Hydrogen Production Efficiency

Résumé

The use of metal single atoms (SAs) as co‐catalysts on semiconductors has emerged as a promising technology to enhance their photocatalytic hydrogen production performance. In this study, we describe the deposition of very low amounts of Pt SAs (<0.1 at %) on exfoliated graphitic carbon nitride (C 3 N 4 ) by a direct Pt−deposition approach from highly dilute chloroplatinic acid precursors. We find that − using this technique−a remarkably low loading of highly dispersed Pt SAs (0.03 wt %) on C 3 N 4 is sufficient to achieve a drastic decrease in the overall charge transfer resistance and a maximized photocatalytic efficiency. The resulting low‐loaded Pt SAs/C 3 N 4 provides a H 2 production rate of 1.66 m mol/h/mg Pt, with a remarkable stability against agglomeration; even during prolonged photocatalytic reactions no sign of light‐induced Pt agglomerations can be observed. We ascribe the high performance and stability to the site‐selective, stable coordination of Pt within the C 3 N 4 structure. Notably the H 2 production rate of the low‐loaded Pt SAs surpasses the activity of Pt SAs deposited by other techniques or nanoparticles at comparable or even higher loading – the optimized Pt SAs decorated C 3 N 4 show ≈5.9 times higher rate than Pt NP decorated C 3 N 4 .

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Catalyse
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hal-04927966 , version 1 (04-02-2025)

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Nawres Lazaar, Siming Wu, Shanshan Qin, Abdessalem Hamrouni, Bidyut Bikash Sarma, et al.. Single‐Atom Catalysts on C 3 N 4 : Minimizing Single Atom Pt Loading for Maximized Photocatalytic Hydrogen Production Efficiency. Angewandte Chemie International Edition, 2025, pp.e202416453. ⟨10.1002/anie.202416453⟩. ⟨hal-04927966⟩
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