Citation: Xiangyang Zou, Ping Guo, Yuanyuan Zhang, Feng Gao, Ping Xu. Magnetic field enhanced electrocatalytic oxygen evolution of CoFe₂O₄ with tunable oxygen vacancy concentrations[J]. Chinese Chemical Letters, ;2026, 37(1): 111659. doi: 10.1016/j.cclet.2025.111659 shu

Magnetic field enhanced electrocatalytic oxygen evolution of CoFe₂O₄ with tunable oxygen vacancy concentrations

Xiangyang Zou ^{a, b, 1} ,
Ping Guo ^{c, 1} ,
Yuanyuan Zhang ^{a, *,} ,
Feng Gao ^{a, *,} ,
Ping Xu ^{b, *,}

a.
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, China
b.
State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
c.
Key Laboratory of Microsystems and Microstructure Manufacturing, Ministry of Education, Harbin Institute of Technology, Harbin 150001, China

zhangyy@hrbnu.edu.cn

gaofeng@hrbnu.edu.cn

pxu@hit.edu.cn

Received Date: 6 July 2025
Revised Date: 26 July 2025
Accepted Date: 30 July 2025
Available Online: 5 August 2025

Figures(5)

Magnetic field-driven spin polarization modulation has emerged as an effective way to boost the electrocatalytic oxygen evolution reaction (OER). However, the correlation among catalyst structure, magnetic property, and magnetic field enhanced-electrochemical activity remains to be fully elucidated. Herein, single-domain CoFe₂O₄ catalysts with tunable oxygen vacancies (CFO-V_O) were synthesized to probe how V_O mediates magnetism and OER activity under magnetic field. The introduction of V_O can simultaneously modulate saturation magnetization (M_s) and coercivity (H_c), where the increased M_s dominates the magnetic field-enhanced OER activity. Under a 14,000 G magnetic field, the optimized CFO-V_O exhibits up to 16.1% reduction in overpotential and 365% enhancement in magnetocurrent (MC). Electrochemical analyses and post-OER characterization reveal that the magnetic field synergistically improves OER kinetics through lattice distortion induction, magnetohydrodynamic effect, and spin charge transfer effect. Importantly, the magnetic field promotes additional Co³⁺ generation to compensate for charge imbalance caused by V_O filling, maintaining dynamic equilibrium of V_O and effective reactant adsorption-conversion processes. This work unveils the synergistic mechanism of V_O and magnetic parameters for enhancing OER performance under the magnetic field, providing new insights into the design of high-efficiency spin-regulated OER catalysts.
- Spinel oxide,
- Oxygen vacancy,
- Magnetic field,
- Magnetic property,
- Oxygen evolution reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

Magnetic field enhanced electrocatalytic oxygen evolution of CoFe2O4 with tunable oxygen vacancy concentrations

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通讯作者: 陈斌, bchen63@163.com

Magnetic field enhanced electrocatalytic oxygen evolution of CoFe₂O₄ with tunable oxygen vacancy concentrations