Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (9): 1527-1533.DOI: 10.1016/S1872-2067(18)63079-7

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Multifarious function layers photoanode based on g-C3N4 for photoelectrochemical water splitting

Zhifeng Liua,b, Xue Lub   

  1. a Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, Hubei, China;
    b School of Material Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China
  • Received:2018-02-28 Revised:2018-04-15 Online:2018-09-18 Published:2018-07-19
  • Contact: 10.1016/S1872-2067(18)63079-7
  • Supported by:

    This work was supported by the Science Funds of Tianjin for Distinguished Young Scholar (17JCJQJC44800), Natural Science Foundation of Tianjin (16JCYBJC17900), and Open Foundation of Hubei Collaborative Innovation Center for High-efficient Utilization of Solar Energy (HBSKFZD2017001).

Abstract:

We report on a novel g-C3N4/TiO2/Co-Pi photoanode combining a TiO2 protection layer, Co-Pi hole capture layer, and g-C3N4 light-absorption layer layer for photoelectrochemical (PEC) water splitting to generate hydrogen for the first time. This new photoanode with three function layers exhibits enhanced PEC performance with a photocurrent density of 0.346 mA·cm-2 at 1.1 V (vs. RHE), which is approximately 3.6 times that of pure g-C3N4 photoanode. The enhanced PEC performance of g-C3N4/TiO2/Co-Pi photoanode benefits from the following:(1) excellent visible light absorption of g-C3N4; (2) stable protection of TiO2 to improve the durability of g-C3N4film; and (3)photogenerated holes capture Co-Pi to separate photogenerated electron-hole pairs efficiently. This promising multifarious function layers structure provides a new perspective for PEC water splitting to generate hydrogen.

Key words: g-C3N4, TiO2, Co-Pi, Photoanode, Photoelectrochemical water splitting