Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (3): 434-445.DOI: 10.1016/S1872-2067(18)63189-4

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Enhanced photocatalytic H2 production over dual-cocatalyst-modified g-C3N4 heterojunctions

Zong Lia, Yongning Maa, Xiaoyun Hub, Enzhou Liua,b,c, Jun Fana   

  1. a School of Chemical Engineering, Northwest University, Xi'an 710069, Shaanxi, China;
    b School of Physics, Northwest University, Xi'an 710069, Shaanxi, China;
    c Institute of Modern Physics, Northwest University, Xi'an 710069, Shaanxi, China
  • Received:2018-08-30 Revised:2018-10-13 Online:2019-03-18 Published:2019-02-22
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21676213, 21476183, 51372201), the China Postdoctoral Science Foundation (2016M600809), and the Natural Science Basic Research Plan in Shaanxi Province of China (2017JM2026).

Abstract:

Ag nanoparticles (NPs) were deposited on the surface of g-C3N4 (CN) by an in situ calcination method. NiS was successfully loaded onto the composites by a hydrothermal method. The results showed that the 10 wt%-NiS/1.0 wt%-Ag/CN composite exhibits excellent photocatalytic H2 generation performance under solar-light irradiation. An H2 production rate of 9.728 mmol·g-1·h-1 was achieved, which is 10.82-, 3.45-, and 2.77-times higher than those of pure g-C3N4, 10 wt%-NiS/CN, and 1.0 wt%-Ag/CN composites, respectively. This enhanced photocatalytic H2 generation can be ascribed to the co-decoration of Ag and NiS on the surface of g-C3N4, which efficiently improves light harvesting capacity, photogenerated charge carrier separation, and photocatalytic H2 production kinetics. Thus, this study demonstrates an effective strategy for constructing excellent g-C3N4-related composite photocatalysts for H2 production by using different co-catalysts.

Key words: Photocatalysis, Photocatalytic H2 generation, g-C3N4, Ag, NiS