Hydrogen absorption and desorption behavior of Ni catalyzed Mg–Y–C–Ni nanocomposites

Tai Yang, Peng Wang, Qiang Li, Chaoqun Xia, Fuxing Yin, Chunyong Liang and Yanghuan Zhang

Energy, 2018, vol. 165, issue PA, 709-719

Abstract: In order to improve the hydrogen storage properties of Mg-based materials, ternary Mg24Y3–3 wt.% graphite (C)–x wt.% Ni (x = 0–20) nanocomposites were synthesized by mechanical ball-milling. Micro-area elemental analysis shows that the Ni and C are evenly distributed in the samples. Effect of Ni content on hydrogen absorption and desorption behavior at various temperatures was performed. Hydrogenation leads to the in situ formation of YH2/YH3 and Mg2Ni/Mg2NiH4, which has a significant catalytic effect on the hydrogen absorption and desorption kinetics. Composites with more than 3 wt% of Ni can almost reach their maximum hydrogen storage capacity within 1 min at 100 °C. When the Ni content increases from 0 to 20 wt%, the dehydrogenation activation energy (Ea) is reduced to 58 kJ/mol, while the desorption peak temperature is also lowered down to 282 °C. Two equilibrium plateaus are clearly observed in pressure–composition isotherms (p–c–T) curves, which can be ascribed to the hydrogen absorption/desorption reactions of Mg/MgH2 and Mg2Ni/Mg2NiH4. In order to take account to the reversible hydrogen storage capacity and absorption/desorption kinetics, Mg24Y3–3 wt.% C–5 wt.% Ni composite is considered having the optimized hydrogen storage performance.

Keywords: Hydrogen storage; Mg-based alloy; Mechanical ball-milling; Catalyst; Kinetics (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:165:y:2018:i:pa:p:709-719

DOI: 10.1016/j.energy.2018.09.132

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