Issue 9, 2023

Structural and kinetic adjustments of Zr-based high-entropy alloys with Laves phases by substitution of Mg element

Abstract

Exploration of high-entropy alloys for hydrogen storage has recently attracted attention owing to their serious defects, high-entropy induced reduction of thermodynamic stability and abundant raw metal elements. In this study, new Zr-based high-entropy alloys with Laves phases were designed where their structure and hydrogen storage properties were adjusted by introducing Mg element. The results show that the addition of Mg element makes the crystal structure of Zr2MgV2−xFexCrNi (x = 0 and 1) alloys change from AB2 type to A3B4 type structure, which further leads to the improvement of their hydrogen storage capacity and hydrogen sorption kinetics. The Zr2MgV2CrNi and Zr2MgVFeCrNi high-entropy alloys can rapidly absorb 0.8 wt% (0.43 H/M) and 0.9 wt% (0.48 H/M) hydrogen at room temperature, respectively, three times higher than those of the Zr-based alloys without Mg-substitution. And more importantly, the absorbed hydrogen of Zr2MgV2CrNi and Zr2MgVFeCrNi high-entropy alloys can be partially released at room temperature with distinct desorption processes. These capacity and kinetic enhancements should be related to the higher lattice parameters, lower electron concentration, severe lattice distortion and smaller average valence electron concentration (VEC) of those alloys. The development of Mg-containing Zr-based high-entropy alloys with Laves phases provides a new idea for the design of new hydrogen storage materials.

Graphical abstract: Structural and kinetic adjustments of Zr-based high-entropy alloys with Laves phases by substitution of Mg element

Article information

Article type
Paper
Submitted
31 May 2023
Accepted
19 Jul 2023
First published
19 Jul 2023
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2023,2, 1409-1418

Structural and kinetic adjustments of Zr-based high-entropy alloys with Laves phases by substitution of Mg element

F. Yin, Y. Chang, T. Si, J. Chen, H. Li, Y. Li and Q. Zhang, Energy Adv., 2023, 2, 1409 DOI: 10.1039/D3YA00243H

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