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Construction of Carbon Covered Mg 2NiH 4 Nanocrystalline for Hydrogen Storage

SSRN Electronic Journal
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    215
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      191
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      24

Article Description

Decreasing the desorption temperature and formation enthalpy are two key challenges for the practical application of magnesium-based hydrogen storage materials. In this paper, different Mg2Ni samples were successfully synthesized, and the corresponding hydrogen storage kinetic and thermodynamic behaviors were investigated. The carbon-covered nanocrystalline Mg2Ni could start to take up hydrogen at room temperature and release hydrogen at 180 °C. Meanwhile, the hydrogenated sample fully desorbed hydrogen at 250 °C within 10 min, and absorbed 2.1 wt% hydrogen in 1 h at 125°C. The absorption and desorption activation energy of carbon-covered nanocrystalline Mg2Ni was calculated to be 18.3 ± 0.2 kJ/mol and 34.1 ± 2.4 kJ/mol, which were 75 % and 78 % lower than that of MgH2, respectively. The dehydrogenation enthalpy of the carbon-covered nanocrystalline Mg2NiH4 sample was also reduced from 84.9 ± 5.3 kJ/mol of MgH2 to 67.3 ± 1.0 kJ/mol. In addition, the cycling kinetics was maintained even after ten cycles. Further analysis revealed that the remarkably improved hydrogen storage property of Mg2NiH4 originated from the combining effect of the alloying, carbon covering, and nanocrystalline strategy.

Bibliographic Details

Xiong Lu; Liuting Zhang; Jiaguang Zheng; Xuebin Yu

Elsevier BV

Hydrogen Storage; Nanocrystalline Mg2Ni; Carbon covering; Kinetics; Thermodynamics

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