Synergistic effect of Co(II)-hole and Pt-electron cocatalysts for enhanced photocatalytic hydrogen evolution performance of P-doped g-C3N4

doi:10.1016/S1872-2067(19)63430-3

Abstract

Abstract: g-C₃N₄ is a metal-free semiconductor and a potential candidate for photocatalytic H₂ production, however, the drawbacks, rapid recombination rate and limited migration efficiency of photogenerated carriers, restrict its photocatalytic activity. Herein, Co(Ⅱ) as a hole cocatalyst modified P-doped g-C₃N₄ were successfully prepared to ameliorate the separation efficiency of photoinduced carriers and enhance the photocatalytic hydrogen production. The photocatalytic results demonstrated that the P-doped g-C₃N₄ (PCN) exhibited higher photocatalytic activity compared with pure g-C₃N₄, while Co(Ⅱ)/PCN photocatalyst exhibited further enhancement of photocatalytic performance. The proposed possible mechanism based on various characterizations is that P-doping can modulate the electronic structure of g-C₃N₄ to boost the separation of photogenerated-e^- and h⁺; while the synergistic effect of both Co(Ⅱ) (as hole cocatalyst) and Pt (as electron cocatalyst) can not only lead to the directional shunting of photogenerated e⁺-h^- pairs, but further accelerate the photogenerated electrons transfer to Pt in order to join the photocatalytic reduction process for hydrogen evolution. As a result, the transportation and separation of photoinduced carriers were accelerated to greatest extent in the Pt/Co(Ⅱ)/PCN photocatalyst.

Key words: Photocatalytic H₂ production, Hole cocatalyst, Electron cocatalyst, P-doped g-C₃N₄

Kouhua Sun, Jun Shen, Qinqin Liu, Hua Tang, Mingyi Zhang, Syed Zulfiqar, Chunsheng Lei. Synergistic effect of Co(II)-hole and Pt-electron cocatalysts for enhanced photocatalytic hydrogen evolution performance of P-doped g-C₃N₄[J]. Chinese Journal of Catalysis, 2020, 41(1): 72-81.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63430-3

https://www.cjcatal.com/EN/Y2020/V41/I1/72

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Synergistic effect of Co(II)-hole and Pt-electron cocatalysts for enhanced photocatalytic hydrogen evolution performance of P-doped g-C₃N₄

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