Journal of Energy Chemistry ›› 2022, Vol. 69 ›› Issue (6): 414-420.DOI: 10.1016/j.jechem.2022.01.045

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FeFx and Fe2ZrO5 Co-modified hematite for highly efficient solar water splitting

Xiaoquan Zhaoa, Cheng Lua, Shuo Lia, Yufeng Chena, Gaoteng Zhanga, Duo Zhangb,*, Kun Fenga,*, Jun Zhonga,*   

  1. aInstitute of Functional Nano and Soft Materials Laboratory (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, Jiangsu, China;
    bState Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Soochow University, Suzhou 215123, Jiangsu, China
  • Received:2021-12-08 Revised:2022-01-26 Accepted:2022-01-28 Online:2022-06-15 Published:2022-10-25
  • Contact: * E-mail addresses: zhangduo@suda.edu.cn (D. Zhang), fengkun0520@163.com (K. Feng), jzhong@suda.edu.cn (J. Zhong)

Abstract: Hematite is an excellent catalyst for photoelectrochemical (PEC) water splitting but its performance has been highly limited by poor conductivity and high charge recombination. Here by a Zr-based treatment to create bulk Fe2ZrO5 in hematite and a F-based treatment to form an ultrathin surface FeFx layer, the charge transfer can be highly improved and the charge recombination can be significantly suppressed. As a result, the FeFx/Zr-Fe2O3 photoanode presents an enhanced PEC performance with a photocurrent density of 2.43 mA/cm2 at 1.23 V vs. RHE, which is around 3 times higher than that of the pristine Fe2O3. The FeFx/Zr-Fe2O3 photoanode also shows a low onset potential of 0.77 V vs. RHE (100 mV lower than the pristine hematite). The performance is much higher than that of the sample treated by Zr or F alone, suggesting the synergistic effect between bulk Fe2ZrO5 and surface FeFx. By coupling with the FeNiOOH co-catalyst, the final photoanode can achieve a high photocurrent density of 2.81 mA/cm2 at 1.23 V vs. RHE. The novel design of Zr and F co-modified hematite can be used as a promising way to pre-pare efficient catalysts for solar water splitting.

Key words: Hematite, Fe2ZrO5, Fluorination, Solar water splitting