Design, Preparation, and Structural Control Mechanism of High Performance Water Splitting NiFeCu Catalyst under Magnetic Field

Zhong Wang , Siyuan Zhang , Xuemin Wang , Chuhan Wang , Weibin Chen , Guojian Li , Xiaoming Liu , Qiang Wang , Shuang Yuan

Energy & Environmental Materials ›› 2026, Vol. 9 ›› Issue (5) : e70277

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Energy & Environmental Materials ›› 2026, Vol. 9 ›› Issue (5) :e70277 DOI: 10.1002/eem2.70277
Research Article
Design, Preparation, and Structural Control Mechanism of High Performance Water Splitting NiFeCu Catalyst under Magnetic Field
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Abstract

Renewable electrically driven water splitting technology is a crucial approach to obtaining clean hydrogen energy. However, the slow kinetics of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) significantly limit the overall efficiency. In this work, density functional theory (DFT) was first employed to design and verify the feasibility of introducing Cu to enhance conductivity, thereby improving catalytic performance. Subsequently, the NiFeCu electrocatalyst with a Cu-rich dendritic structure was synthesized via a magnetic field-assisted electrodeposition strategy. Numerical simulations by COMSOL and Fluent reveal the role and mechanism of the magnetic field, especially the “magnetic diffusion effect” of improving the diffusion coefficient of Cu ions by reducing the radius of hydrated Cu2+ ions and the viscosity of the solution. Thermodynamic calculations show that the magnetic Gibbs free energy of the reaction process increases by 170 kJ m ol−1 when a 0.5 T magnetic field is applied, proving that the magnetic field can accelerate the reaction. X-ray absorption fine structure (XAFS) analysis further confirmed that the Cu-rich structure donates electrons to Ni and Fe, optimizing the adsorption of intermediates. When the current density is 10 mA c m−2, the HER and OER overpotentials of NiFeCu-0.5 are 44 and 188 mV in 1 m KOH, and only 1.48 V ultralow battery voltage is needed for overall water splitting. This research provides a new idea for designing high catalytic activity bifunctional catalysts and opens up a new direction for applying magnetic fields in material preparation and structural optimization.

Keywords

Cu-rich / high efficiency / hydrogen evolution reaction / magnetic field / oxygen evolution reaction

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Zhong Wang, Siyuan Zhang, Xuemin Wang, Chuhan Wang, Weibin Chen, Guojian Li, Xiaoming Liu, Qiang Wang, Shuang Yuan. Design, Preparation, and Structural Control Mechanism of High Performance Water Splitting NiFeCu Catalyst under Magnetic Field. Energy & Environmental Materials, 2026, 9 (5) : e70277 DOI:10.1002/eem2.70277

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