Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (11): 1753-1761.DOI: 10.1016/S1872-2067(18)63135-3

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Metal-free graphene quantum dots photosensitizer coupled with nickel phosphide cocatalyst for enhanced photocatalytic hydrogen production in water under visible light

Liang Zhu, Qiudi Yue, Daochuan Jiang, Huanlin Chen, Rana Muhammad Irfan, Pingwu Du   

  1. Hefei National Laboratory for Physical Sciences at the Microscale, iChEM(Collaborative Innovation Center of Chemistry for Energy Materials), CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China
  • Received:2018-06-29 Revised:2018-07-06 Online:2018-11-18 Published:2018-09-01
  • Contact: 10.1016/S1872-2067(18)63135-3
  • Supported by:

    This work was supported by the National Key Research and Development Program of China (2017YFA0402800), the National Natural Science Foundation of China (51772285, 21473170), and the Fundamental Research Funds for the Central Universities.

Abstract:

Photocatalytic hydrogen (H2) evolution is a promising approach for future sustainable energy utilization. However, it is still a great challenge to develop efficient and stable metal-free photocatalysts with broadband solar absorption in the visible region for H2 production. Metal-free graphene quantum dot (GQD) is an emerging candidate for this purpose because of its good water-solubility and tunable band gap. On the other hand, metal phosphides (Ni2P, Co2P, etc) have been demonstrated as novel noble-metal-free cocatalysts for water splitting, which can efficiently separate electron-hole pairs and enhance the photocatalytic activities. Herein, we report for the first time on the use of OH-functionalized GQDs (OH-GQDs) photosensitizer coupled with Ni2P nanoparticles for photocatalytic H2 production with λ > 420 nm light. The H2 production rate is~94 times higher than that of bare OH-GQDs, which is even comparable to that of OH-GQDs with 1.0 wt% Pt cocatalyst. This enhancement is probably due to the semiconductor-cocatalyst interface interaction between Ni2P and OH-GQDs to facilitate efficient charge transfer process.

Key words: Noble-metal-free, Photocatalysis, Hydrogen production, OH-functionalized graphene quantum dotts, Ni2P