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Received May 12, 2022
Accepted September 13, 2022
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Improved the hydrogen sorption properties of MgH2 by CeMnZr solid solution

1Department of Environmental Engineering, Hebei University of Environmental Engineering, Qinhuangdao, 066102, P. R. China 2Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao, 066102, China 3Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, P. R. China 4, China
Korean Journal of Chemical Engineering, January 2023, 40(1), 104-111(8), 10.1007/s11814-022-1287-9
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Abstract

Magnesium hydride (MgH2) is one of the promising solid-state hydrogen storage materials because of its high capacity, abundant resource and excellent reversibility. However, the high dehydrogenation temperatures and sluggish kinetics restrict its practical application. It was found that doping catalysts could significantly improve the hydrogen storage properties of MgH2. The solid solution Ce0.8Mn0.1Zr0.1O2 (denoted as CeMnZr) with abundant oxygen vacancy was synthesized and its catalytic influence on the hydrogen sorption properties of MgH2 have been investigated. CeMnZr modified MgH2 composite showed a reduced initial decomposition temperature, almost 62 K lower than the pristine MgH2. At 473 K, MgH2-CeMnZr composite had an absorption capacity of 4.08 wt% hydrogen within 3,500 s, which was about twice better than the pure MgH2 at same condition. MgH2-CeMnZr sample could desorb 2.56 wt% of H2 within 3,500 s at 573 K compared to low desorption rate and 0.85 wt% H2 by as-milled MgH2. The activation energy (Ea) for CeMnZr codoped MgH2 sample is about 50 kJ·mol?1 lower than the milled MgH2. Based on the characteration analysis, the in-situ generated MgO and CeH2.51 species as well as abundant oxygen vacancy is believed to play synergistic catalytic effects in enhancing the hydrogen storage properties of MgH2.

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