Ge‐Doped Hematite with FeCoNi‐Bi as Cocatalyst for High‐Performing Photoelectrochemical Water Splitting

Author:

Wang Yueyang123ORCID,Cui Shibo123,Tian Zhenyu123ORCID,Han Meisheng456,Zhao Tianshou456ORCID,Li Wenjia3456ORCID

Affiliation:

1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy Tianjin University Tianjin 300350 P. R. China

2. School of Mechanical Engineering Tianjin University Tianjin 300072 P. R. China

3. National Industry‐Education Platform of Energy Storage Tianjin University Tianjin 300350 P. R. China

4. SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology Shenzhen 518055 P. R. China

5. Shenzhen Key Laboratory of Advanced Energy Storage Southern University of Science and Technology Shenzhen 518055 P. R. China

6. Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China

Abstract

AbstractHematite is a promising photoanode material for photoelectrochemical water‐splitting technology. However, the low current density associated with the low conductivity, low charge carrier mobility, and poor oxygen evolution catalytic activity is a challenging issue for the material. In this study, the challenge is addressed by introducing Germanium (Ge) doping, coupled with the use of FeCoNi‐Bi as a co‐catalyst. Ge doping not only increases the conductivity and charge carrier concentration of the hematite photoanode, but also induces nanopores, thereby expanding its electrochemical reactive surface area to facilitate the oxygen evolution reaction. In the meantime, the FeCoNi‐Bi cocatalyst electrodeposited onto the surface of Ge‐doped hematite, improves the oxygen evolution reaction performance. As a result, the obtained photoanode achieves a photocurrent density of 2.31 mA cm−2 at 1.23 VRHE, which is three times higher than that of hematite (0.72 mA cm−2). Moreover, a new analytical method is introduced to scrutinize both the positive and negative effects of Ge doping and FeCoNi‐Bi cocatalyst on the photoanode performance by decoupling the photoelectrochemical process steps. Overall, this study not only enhances the performance of hematite photoanodes but also guides their rational design and systematic assessment.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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