A Novel Silver-Carbon Bond-Engineered Metal-Organic Framework toward Efficient Artificial Photosynthesis of Hydrogen Peroxide

doi:10.6023/A25110383

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基于银-碳键的新型金属有机框架用于高效光催化合成过氧化氢

陈慧滢^a, 黄宁宇^*,b, 廖培钦^*,a

^a中山大学化学学院,广州 510275;
^b南洋理工大学材料科学与工程学院,新加坡 639798

投稿日期:2025-11-26
基金资助:
国家重点研发计划(2024YFF0506100)、国家自然科学基金(22090061、22488101和22371304)、广东省科技创新战略专项资金(STKJ2023078)、中山大学中央高校基本科研业务费(24lgzy006)以及广州市科技计划项目(SL2023A04J01767)资助.

A Novel Silver-Carbon Bond-Engineered Metal-Organic Framework toward Efficient Artificial Photosynthesis of Hydrogen Peroxide

Chen Huiying^a, Huang Ningyu^*,b, Liao Peiqin^*,a

^aCollege of Chemistry, Sun Yat-sen University, Guangzhou 510275, China;
^bSchool of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore

Received:2025-11-26
Contact: ^*E-mail: ningyu.huang@ntu.edu.sg; liaopq3@mail.sysu.edu.cn
Supported by:
National Key R&D Program of China (2024YFF0506100), NSFC (22090061, 22488101 and 22371304), the Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province (STKJ2023078), Fundamental Research Funds for the Central Universities, Sun Yat-Sen University (24lgzy006), and the Guangzhou Science and Technology Program (SL2023A04J01767).

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Abstract

The development of highly efficient and stable photocatalysts for solar-driven hydrogen peroxide (H₂O₂) production represents a pivotal direction in green chemistry research. Herein, we report the successful synthesis of a novel silver-based metal-organic framework (MOF) photocatalyst, Ag-TEPT (where TEPT = 2,4,6-tris(4-ethynylphenyl)-1,3,5-triazine), which was constructed via a metal-carbon (M-C) bond coordination strategy to bridge Ag(I) clusters with triazine-based linkers. Under simulated sunlight irradiation, Ag-TEPT exhibited an outstanding H₂O₂ production rate of 2880 μmol g^-1 h^-1 in a pure water-oxygen system without any sacrificial agents, a performance that significantly surpasses most reported photocatalysts. Impressively, it maintained a high production rate of 2024 μmol g^-1 h^-1 even in ambient air. Furthermore, Ag-TEPT demonstrated remarkable photocatalytic stability with negligible activity loss over three consecutive reaction cycles. Post-catalytic characterization confirmed its unvaried crystal structure, morphology, and surface chemical states, attesting to its potential as a high-performance and durable photocatalyst. Mechanistic studies revealed a dual-pathway reaction mechanism, wherein H₂O₂ generation proceeds via simultaneous 2e^- ORR and 4e^- WOR processes. Notably, the O₂ produced from the 4e^- WOR serves as an internal feedstock for the 2e^- ORR, mitigating the dependency on exogenous O₂ and thereby enhancing the overall catalytic efficiency. In addition, the band structure of AgC-MOF, constructed from Tauc plot fitting and Mott-Schottky measurements, provided thermodynamic validation that Ag-TEPT is suitable for the photocatalytic reduction of O₂ to H₂O₂ and the oxidation of H₂O to O₂, but not for the direct oxidation of H₂O to H₂O₂. Photoluminescence spectroscopy and photoelectrochemical measurements confirmed the exceptional photogenerated charge separation efficiency of AgC-MOF, a benefit derived from the superior electron transport capability of the Ag-alkynyl bonds, which led to markedly improved photocatalytic reaction kinetics. In particular, Ag-TEPT showed a substantially higher photocurrent density, attributable to the excellent photosensitivity of the triazine units within the TEPT linker.

Key words: silver-carbon bond, metal-organic frameworks, photocatalytic H₂O₂ production, ORR, WOR

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Chen Huiying, Huang Ningyu, Liao Peiqin. A Novel Silver-Carbon Bond-Engineered Metal-Organic Framework toward Efficient Artificial Photosynthesis of Hydrogen Peroxide[J]. Acta Chimica Sinica, doi: 10.6023/A25110383.

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基于银-碳键的新型金属有机框架用于高效光催化合成过氧化氢

A Novel Silver-Carbon Bond-Engineered Metal-Organic Framework toward Efficient Artificial Photosynthesis of Hydrogen Peroxide

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