Issue

Vol. 18 (2026)

Integrating Overall Water Splitting with Advanced Oxidation for Wastewater Treatment Using a Bifunctional Medium-Entropy Amorphous Alloy

https://doi.org/10.1007/s40820-026-02172-1
Yifan Cui
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Yonghui Wang
School of Physics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Bo Li
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Jiaqi Huang
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Le Bo
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Hengqi Liu
School of Physics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Mahlanyane Kenneth Mathe
Department of Chemistry, University of South Africa, Johannesburg 1709, South Africa
Murodjon Samadiy
Department of Chemical Engineering and Biotechnology, Karshi State Technical University, 180100 Karshi, Uzbekistan
Shengfeng Guo
School of Materials and Energy, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Southwest University, Chongqing 400715, People’s Republic of China
Hongxian Shen
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Jianfei Sun
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Sida Jiang
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China

Corresponding Author: Sida Jiang

jiangsida@hit.edu.cn

Nano-Micro Letters, Vol. 18 (2026), Article Number: 333

Abstract

Hydrogen energy is regarded as a clean and reliable approach for storing intermittent energy sources. However, stringent water quality requirements remain critical challenges. The development of a bifunctional catalyst capable of simultaneously driving overall water splitting and degrading pollutants in wastewater can substantially enhance energy utilization efficiency and enable resource recycling. Nevertheless, the mismatch in the optimal pH conditions and the difficulty in balancing degradation efficiency and electrolysis performance remain notable obstacles. In this study, (FeCoNi)80B20 medium-entropy amorphous alloy (MEAA) fibers were prepared using a low-cost melt-extraction method. Owing to the crystalline–amorphous heterostructure, the fibers achieved complete decolorization within 90 s, while remaining effective across a wide pH range. In addition, the (FeCoNi)80B20 delivered overpotentials of 275 and 220 mV for the oxygen evolution reaction and hydrogen evolution reaction, respectively. By synchronizing both catalytic reactions, the (FeCoNi)80B20 enabled direct water splitting in reclaimed water, achieving complete decolorization while preserving electrocatalytic stability in an anion-exchange-membrane electrolyzer for 100 h under highly alkaline conditions (pH = 13.6). Moderate OH* adsorption endowed (FeCoNi)80B20 with excellent ability. This bifunctional catalyst addresses the coupled challenges of energy storage and water scarcity and offers a promising foundation for industrial implementation.


Highlights:
1 (FeCoNi)80B20 fibers were prepared via a melt-extraction method with a high cooling rate to construct a crystalline–amorphous heterostructure. A substantial quantity of fibers (~ 100 g) was produced in a single batch, resulting in a competitive cost of approximately 0.51 USD per gram with accurate composition and high quality.
2 In simulated reclaimed water, complete decolorization of the solution was achieved within 60 min, whereas the water splitting process maintained stable operation for approximately 115 h. The total organic carbon removal rate reached 63.24%.

Keywords

Medium-entropy amorphous alloy Crystalline-amorphous heterostructure Water splitting Water remediation Water–energy nexus strategy
Cui, Yifan, Yonghui Wang, Bo Li, Jiaqi Huang, Le Bo, Hengqi Liu, Mahlanyane Kenneth Mathe, Murodjon Samadiy, Shengfeng Guo, Hongxian Shen, Jianfei Sun, and Sida Jiang. 2026. “Integrating Overall Water Splitting With Advanced Oxidation for Wastewater Treatment Using a Bifunctional Medium-Entropy Amorphous Alloy”. Nano-Micro Letters 18 (April):333. https://doi.org/10.1007/s40820-026-02172-1.
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