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Updated: Jan 12, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Magnetic Field-Driven Spin State Transformation in Promoting the Catalytic Activity of Doped Single-Atom for Hydrogen
Chenjing Wang1, Yuquan Yang1, Jinlong Zheng1,2
1Beijing Advanced Innovation Center for Materials Genome Engineering, School of Advanced Materials Innovation, University of Science and Technology Beijing, Beijing, 100083, China.
None:
Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) requires innovative strategies to modulate electronic structures and reaction kinetics. Herein, a ferromagnetic RuSAs/Ni2P@Fe3O4 core-shell catalyst is designed, which synergizes Ru single-atoms (SAs) doping and external magnetic field excitation. Under a 0.3 T magnetic field, RuSAs/Ni2P@Fe3O4-0.3 T achieves a remarkably low overpotential of 38.9 mV at 10 mA cm-2 and a Tafel slope of 39.5 mV dec-1 in alkaline media, outperforming its counterparts without magnetic stimulation. Advanced characterization (XANES, Mössbauer, EPR, SQUID) and density functional theory calculations reveal that the magnetic field induces a spin-state transition in Fe3+ (from low-spin to high-spin), enhancing interfacial charge transfer and enriching electron density around Ru SAs. These effects optimize hydrogen adsorption free energy (ΔGH*) and reaction kinetics. The Ru SAs serve as the dominant active sites, while the spin-state reconfiguration of the Fe3O4 core under magnetic fields stabilizes the structure and accelerates electron transfer. This work unveils a dual-regulation mechanism combining atomic doping and spin engineering, offering a novel pathway for designing high-performance catalysts via electronic and magnetic synergy.
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