Issue 25, 2023

Effects of Ni precursors on the formation of Mg–Fe–Ni intermetallic hydrides, kinetics, and reversibility

Abstract

This work focuses on the effects of Ni precursors (metallic Ni or Mg2NiH4) on the formation of Mg–Fe–Ni intermetallic hydrides as well as their de/rehydrogenation kinetics and reversibility. After ball milling and sintering, the formation of Mg2FeH6 and Mg2NiH4 are found in both samples, while MgH2 is observed only in the sample with metallic Ni. Both samples show comparable hydrogen capacities of 3.2–3.3 wt% H2 during the 1st dehydrogenation, but the sample with metallic Ni decomposes at a lower temperature (ΔT = 12 °C) and shows faster kinetics. Although phase compositions after dehydrogenation of both samples are comparable, their rehydrogenation mechanisms are different. This affects the kinetic properties upon cycling and reversibility. Reversible capacities of the samples with metallic Ni and Mg2NiH4 during the 2nd dehydrogenation are 3.2 and 2.8 wt% H2, respectively, while those during the 3rd–7th cycles reduce to ∼2.8 and 2.6 wt% H2, respectively. Chemical and microstructural characterizations are carried out to explain de/rehydrogenation pathways.

Graphical abstract: Effects of Ni precursors on the formation of Mg–Fe–Ni intermetallic hydrides, kinetics, and reversibility

Associated articles

Article information

Article type
Paper
Submitted
23 Mar 2023
Accepted
15 May 2023
First published
05 Jun 2023
This article is Open Access
Creative Commons BY license

RSC Adv., 2023,13, 16926-16934

Effects of Ni precursors on the formation of Mg–Fe–Ni intermetallic hydrides, kinetics, and reversibility

P. Dansirima, S. Thiangviriya, P. Plerdsranoy, N. Chanlek and R. Utke, RSC Adv., 2023, 13, 16926 DOI: 10.1039/D3RA01914D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements