Freestanding Fe3C twinning/amorphous NiP electrode with carbon-linked interface for enhanced alkaline oxygen evolution

doi:10.1016/j.jmst.2025.10.036

Abstract

Abstract: Conventional powder-based oxygen evolution reaction (OER) catalysts typically require polymer binders, leading to poor mechanical stability, high interfacial resistance, and limited exposure of active sites, which hinder their performance in industrial applications. Herein, we report a flexible freestanding electrode with a novel triple-phase heterostructure composed of a Fe₃C twinning core, an interfacial amorphous carbon layer, and an outer amorphous NiP shell, constructed via a facile electrospinning-electrodeposition method strategy. This integrated architecture enables intimate contact between the catalyst, conductive scaffold, and electrolyte, forming a well-defined interface that significantly accelerates electron transfer and gas evolution. Benefiting from the twin-interface-amorphous synergy, the electrode exhibits enthusiastic OER activity in alkaline media, achieving a low overpotential of 225 mV at 10 mA cm^-2 and long-term stability under continuous operation at 100 mA cm^-2, as well as impressive performance in anion exchange membrane electrolyzers.

Key words: Twin boundary, Oxygen evolution reaction, Heterostructure, Water splitting

Yujun Han, Li Shao, Liyang Xiao, Pengfei Huang, Tongzhou Wang, Lei Shi, Yuefei Zhang, Jihong Li, Wenbin Hu, Yida Deng. Freestanding Fe₃C twinning/amorphous NiP electrode with carbon-linked interface for enhanced alkaline oxygen evolution[J]. J. Mater. Sci. Technol., 2026, 262: 109-118.

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Freestanding Fe₃C twinning/amorphous NiP electrode with carbon-linked interface for enhanced alkaline oxygen evolution

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