Chinese Journal of Catalysis ›› 2023, Vol. 48: 137-149.DOI: 10.1016/S1872-2067(23)64422-5

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Benzimidazole-based covalent organic framework embedding single-atom Pt sites for visible-light-driven photocatalytic hydrogen evolution

Fangpei Maa, Qingping Tanga, Shibo Xib, Guoqing Lia, Tao Chena, Xingchen Linga, Yinong Lyuc, Yunpeng Liud, Xiaolong Zhaoa, Yu Zhoua,*(), Jun Wanga,*()   

  1. aState Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
    bInstitute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833, Singapore
    cState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
    dInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-11-24 Accepted:2023-03-06 Online:2023-05-18 Published:2023-04-20
  • Contact: * E-mail: njutzhouyu@njtech.edu.cn (Y. Zhou), junwang@njtech.edu.cn (J. Wang).
  • Supported by:
    National Natural Science Foundation of China(22072065);National Natural Science Foundation of China(22178162);National Natural Science Foundation of China(22222806);National Natural Science Foundation of China(U1662107);National Natural Science Foundation of China(21136005);Distinguished Youth Foundation of Jiangsu Province(BK20220053);Six Talent Peaks Project in Jiangsu Province(JNHB-035);State Key Laboratory of Materials-Oriented Chemical Engineering-Open Fund(KL20-07);Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX20_1018);Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

Abstract:

Visible-light-driven photocatalytic hydrogen evolution reaction (HER) over a semiconductor provides an effective avenue to produce renewable clean energy and alleviate energy and environmental crises. However, the HER efficiency is still limited by the sluggish electron transfer process. Herein, a highly active covalent organic framework (COF) was constructed from the unusual benzimidazole monomer in a microwave-assisted solvothermal pathway. With single-atom Pt sites as cocatalyst, the catalyst exhibited an HER rate up to 115 mmol g-1 h-1 and a high turnover frequency of 4475.1 h-1 under visible-light irradiation. The above performance relied on the combination of benzimidazole moieties and COF framework, which, on the one hand, stabilized photogenerated electrons to prolong the electron lifetime, and on the other hand provided a strong host-guest interaction that resulted in the creation of single-atom Pt sites and the acceleration of the electron-transfer to the active sites for proton reduction. This work demonstrates the perspective of electron stabilization and interfacial charge transfer avenue construction in the HER process, which can be reached by a molecular-level design of COF-based organic semiconductors by using structural and functional diverse asymmetric building blocks.

Key words: Covalent organic framework, Photocatalysis, Hydrogen evolution reaction, Single-atom catalysis, Renewable energy