Hydrogen storage properties and cycling degradation of single-phase La0.60R0.15Mg0·25Ni3.45 alloys with A2B7-type superlattice structure

Jingjing Liu, Honghui Cheng, Shumin Han, Hongfei Liu and Jacques Huot

Energy, 2020, vol. 192, issue C

Abstract: Single-phase La–Mg–Ni-based alloys show promising hydrogen storage performance. In this paper, we report the gaseous hydrogen storage characteristics, especially cycling performance of a series of A2B7-type single-phase La0.60R0.15Mg0·25Ni3.45 (R = Pr, Nd and Gd) alloys. These alloys are composed of [AB5] and [A2B4] subunits stacking along c-axis in the ratio of 2:1. With cycling, degradation occurs which results in a sloped and increased plateau pressure, larger hysteresis and decreased hydrogen storage capacity. Structurally, the degradation is caused by the alloys’ lattice expansion/contraction which leads to significant microstrain and decrease in grain size. It is found that the alloy with R = Gd experiences minimal microstrain and preserves good crystallinity during hydrogen absorption/desorption owing to its almost equal [A2B4] and [AB5] subunit volumes. The R = Gd alloy achieved a cycling retention of 89.5% after 100 cycles compared with 79.8%–81.8% for the other two alloys. Additionally, the R = Gd alloy also possesses high reversibility, flat plateau and small hysteresis, showing a great potential in the hydrogen storage applications.

Keywords: La–Mg–Ni-Based alloy; A2B7-type superlattice structure; Hydrogen storage property; Structural evolution; Degradation mechanism (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:192:y:2020:i:c:s0360544219323126

DOI: 10.1016/j.energy.2019.116617

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