Article

Nanoporous/Nanocrystalline/Amorphous Multiphase Surfaces on Amorphous Alloy Fibers for Enhanced Oxygen Evolution Reaction Performance

Bo LiSchool of Materials Science and Engineering Harbin Institute of Technology Harbin ChinaYonghui WangSchool of Physics Harbin Institute of Technology Harbin ChinaYi‐Fan CuiSchool of Materials Science and Engineering Harbin Institute of Technology Harbin ChinaJia‐Qi HuangSchool of Materials Science and Engineering Harbin Institute of Technology Harbin ChinaMahlanyane K MatheDepartment of Chemistry University of South Africa Johannesburg South AfricaMurodjon SamadiyDepartment of Chemical Engineering and Biotechnology Karshi State Technical University Karshi UzbekistanJianfei SunSchool of Materials Science and Engineering Harbin Institute of Technology Harbin ChinaChen LiuSchool of Physics Harbin Institute of Technology Harbin ChinaZhi-liang NingSchool of Materials Science and Engineering Harbin Institute of Technology Harbin ChinaYong‐Jiang HuangSchool of Materials Science and Engineering Harbin Institute of Technology Harbin ChinaSi‐Da JiangNational Key Laboratory of Space Environment and Matter Behaviors Harbin Institute of Technology Harbin China

2026en

ABI

Abstract

ABSTRACT The development of high‐performance and cost‐effective oxygen evolution reaction (OER) electrocatalysts is critical for the large‐scale deployment of green hydrogen technologies. Among various candidates, amorphous alloys have emerged as promising OER catalysts owing to their long‐range disordered atomic structures, high energy states, and abundant unsaturated coordination sites. However, their practical performance is constrained by limited structural tunability and relatively low electrical conductivity. In this study, a general strategy involving nanocrystal introduction followed by dealloying was developed to convert FeNi‐based amorphous alloy fibers into nanoporous/nanocrystalline/amorphous (N/N/A) multiphase alloy fibers. This strategy generates a hierarchical architecture in which the interior consists of coexisting nanocrystalline and amorphous phases, and the surface region features ultrasmall NiO nanocrystals (∼2 nm), abundant nanopores, and a residual amorphous matrix. The resulting N/N/A fibers delivered a low OER overpotential of 210 mV at 10 mA cm −2 and sustained stable operation for over 700 h at 50 mA cm −2 . The enhanced catalytic performance originates from the synergistic effects of enlarged surface area, enhanced surface reconstruction, and optimized electronic and coordination environments. Importantly, the generality and effectiveness of this strategy were validated across 10 different amorphous alloys, all of which exhibited consistent performance enhancement.

Identifiers

DOI: 10.1002/rar2.70525

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