Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (1): 123-134.DOI: 10.1016/S1872-2067(15)61012-9

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Flower-like 3D CuO microsphere acting as photocatalytic water oxidation catalyst

Xiaoqiang Dua, Jingwei Huanga, Yingying Fenga, Yong Dinga,b   

  1. a Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry and College of Chemistry Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, China;
    b State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
  • Received:2015-10-29 Revised:2015-11-07 Online:2015-12-26 Published:2015-12-26
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21173105, 21172098).

Abstract:

Flower-like 3D CuO microspheres were synthesized and used to photo-catalyze water oxidation under visible light. The structure of the CuO microspheres was characterized by scanning electron microscopy, transmission electron microscopy, infrared, powder X-ray diffraction, electron dispersive spectroscopy, Raman and X-ray photoelectron spectroscopy (XPS). This is the first time that a copper oxide was demonstrated as a photocatalytic water oxidation catalyst under near neutral conditions. The catalytic activity of CuO microspheres in borate buffer shows the best performance with O2 yield of 11.5%. No change in the surface properties of CuO before and after the photocatalytic reaction was seen by XPS, which showed good catalyst stability. A photocatalytic water oxidation reaction mechanism catalyzed by the CuO microspheres was proposed.

Key words: Photocatalysis, Water oxidation, Metal catalyst, CuO microsphere, Stability