Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (4): 760-770.DOI: 10.1016/S1872-2067(17)62978-4

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Gold/monolayer graphitic carbon nitride plasmonic photocatalyst for ultrafast electron transfer in solar-to-hydrogen energy conversion

Zhao Moa, Hui Xua, Zhigang Chena, Xiaojie Shea, Yanhua Songb, Pengcheng Yana, Yuanguo Xua, Yucheng Leia, Shouqi Yuana, Huaming Lia   

  1. a School of Materials Science & Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212003, Jiangsu, China;
    b School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
  • Received:2017-11-30 Revised:2017-12-31 Online:2018-04-18 Published:2018-04-08
  • Contact: 10.1016/S1872-2067(17)62978-4
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21476097, 21776118), the Six Talent Peaks Project in Jiangsu Province (2014-JNHB-014), the Natural Science Foundation of Jiangsu Province (BK20161363), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17-1769), and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

Abstract:

Gold (Au) plasmonic nanoparticles were grown evenly on monolayer graphitic carbon nitride (g-C3N4) nanosheets via a facile oil-bath method. The photocatalytic activity of the Au/monolayer g-C3N4 composites under visible light was evaluated by photocatalytic hydrogen evolution and environmental treatment. All of the Au/monolayer g-C3N4 composites showed better photocatalytic performance than that of monolayer g-C3N4 and the 1% Au/monolayer g-C3N4 composite displayed the highest photocatalytic hydrogen evolution rate of the samples. The remarkable photocatalytic activity was attributed largely to the successful introduction of Au plasmonic nanoparticles, which led to the surface plasmon resonance (SPR) effect. The SPR effect enhanced the efficiency of light harvesting and induced an efficient hot electron transfer process. The hot electrons were injected from the Au plasmonic nanoparticles into the conduction band of monolayer g-C3N4. Thus, the Au/monolayer g-C3N4 composites possessed higher migration and separation efficiencies and lower recombination probability of photogenerated electron-hole pairs than those of monolayer g-C3N4. A photocatalytic mechanism for the composites was also proposed.

Key words: Monolayer g-C3N4, Au plasmonic nanoparticle, Photocatalytic hydrogen evolution, Hot electron, Au/monolayer g-C3N4