Hydrogen storage performance of non-equiatomic V35Co10Cr20Fe15Mn20 high-entropy alloy synthesized by mechanical alloying

被引：0

作者：

Pariskar, Avinash Prabhakar ^{[1
]}

Moganraj, Arivarasu ^{[2
]}

机构：

[1] Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Tamil Nadu, Vellore

[2] Centre for Innovative Manufacturing Research, Vellore Institute of Technology, Tamil Nadu, Vellore

来源：

International Journal of Hydrogen Energy | 2025年 / 148卷

关键词：

Electrochemical testing; High-entropy alloy; Hydrogen absorbing material; Hydrogen storage; Mechanical alloying;

D O I：

10.1016/j.ijhydene.2025.150055

中图分类号：

学科分类号：

摘要：

The production of non-equiatomic high-entropy alloy (HEA) powders plays a crucial role in the application of HEAs in energy storage and energy conversion. In the present study, a novel non-equiatomic V35Co10Cr20Fe15Mn20 alloy was prepared using mechanical alloying. The morphologies and chemical composition of milled V35Co10Cr20Fe15Mn20 alloy powders were characterised by various microscopy techniques and X-ray photoelectron spectroscopy (XPS). As the milling time increased to 50 h, a single-phase body-centered cubic structure was achieved, as confirmed by X-ray diffraction (XRD). Transmission electron microscopy (TEM) analysis of 50 h milled HEA powder showed a solid-solution BCC structure with a lattice constant of 2.87 ± 0.02 Å and a fine powdery morphology. The milled HEA powder compositions are close to the nominal composition. XPS analysis showed that the metals in the milled HEA powders are present in the metallic state without any contamination. Attempts were made to study the electrochemical hydrogen storage performance of V35Co10Cr20Fe15Mn20 in an alkali medium through cyclic voltammetry and the chronopotentiometry technique. Electrochemical results revealed a hydrogen storage capacity of 490.90 F/g and a hydrogen discharge specific capacity of 150 mAh/g at a current density of 1 A/g. This study demonstrates that electrochemical methods provide an effective and reliable approach for characterizing the hydrogen storage properties of a wide range of mechanically alloyed HEA powders. © 2025 Hydrogen Energy Publications LLC

引用

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