Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (3): 438-445.DOI: 10.1016/S1872-2067(18)63037-2

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Efficient development of Type-II TiO2 heterojunction using electrochemical approach for an enhanced photoelectrochemical water splitting performance

Yuanxing Fang, Yiwen Ma, Xinchen Wang   

  1. State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, Fujian, China
  • Received:2017-12-26 Revised:2018-01-12 Online:2018-03-18 Published:2018-03-10
  • Contact: 10.1016/S1872-2067(18)63037-2
  • Supported by:

    This work was supported from the National Natural Science Foundation of China (21425309, 21761132002, 21703040), China Postdoctoral Science Foundation (2017M622051), and the 111 Project.

Abstract:

Type-Ⅱ-heterojunction TiO2 nanorod arrays (NAs) are achieved by a combination of reduced and pristine TiO2 NAs through a simple electrochemical reduction. The heterojunc-tion-structured TiO2 NAs exhibit an enhanced photo-efficiency, with respect to those of pristine TiO2 NAs and completely reduced black TiO2. The improved efficiency can be attributed to a synergistic effect of two contributions of the partially reduced TiO2 NAs. The light absorption is significantly increased, from the UV to the visible spectrum. Moreover, the type Ⅱ structure leads to enhanced separation and transport of the electrons and charges. The proposed electro-chemical approach could be applied to various semiconductors for a control of the band struc-ture and improved photoelectrochemical performance.

Key words: Type II heterojunction structure, Photoelectrochemical water splitting, TiO2, Electrochemical reduction, Modification