Citation: Chuan-Wang ZENG, Xiao-Xiao LI, Jin-Ming ZENG, Cao LIU, Jia-Jun LAI, Xiao-Peng QI. Synergistic enhancement of catalytic water electrolysis performance of iron-cobalt-based materials by oxygen vacancies and phosphorus doping[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(2): 202-210. doi: 10.11862/CJIC.2023.006 shu

Synergistic enhancement of catalytic water electrolysis performance of iron-cobalt-based materials by oxygen vacancies and phosphorus doping

Chuan-Wang ZENG ^{1, 2} ,
Xiao-Xiao LI ^{1, 2} ,
Jin-Ming ZENG ^{1, 2} ,
Cao LIU ^{1, 2} ,
Jia-Jun LAI ^{1, 2} ,
Xiao-Peng QI ^{1, 2,,}

1.
Rare Earth College, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341400, China
2.
Ganzhou Key Laboratory of Hydrogen Materials and Devices, Ganzhou, Jiangxi 341000, China

Corresponding author: Xiao-Peng QI, qxpai@163.com
Received Date: 21 June 2022
Revised Date: 5 December 2022

Figures(7)

Oxygen vacancies and hetero atom filling play an important role in the catalytic performance of materials. To develop an efficient and stable water electrolysis catalyst, based on the oxygen vacancies and phosphorus doping, nanoflower structures with oxygen vacancy and phosphorus doping were synthesized on iron foam by in-situ immersion growth and two-step heat treatment as hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts. CoFe₂O₄ has been reported as a promising electrocatalyst for OER and oxygen reduction reaction (ORR). However, CoFe₂O₄ exhibits poor conductivity and slow electrocatalytic reaction in HER. The formation of oxygen vacancy (Ov) in CoFe₂O₄ can effectively regulate the electronic structure of the catalyst surface and contribute to the formation of more defects and vacancies, thus improving the activity of OER. Then, we added phosphorus atoms to fill the vacancy, and the prepared P-Ov-CoFe₂O₄/IF showed excellent performance of HER and OER in the alkaline electrocatalytic test. At the current density of 10 mA·cm^-2, the overpotentials of HER and OER were only 54 and 191 mV, and the Tafel slopes were 57 and 54 mV·dec^-1, respectively. The prepared electrocatalyst also dem-onstrated excellent cycling stability.
- oxygen vacancy,
- electrolysis,
- phosphorus doping,
- hydrogen evolution reaction,
- oxygen evolution reaction
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