Crystallitic Structure and Thermodynamics of Magnesium-Based Hydrogen Storage Materials from Reactive Milling under Hydrogen Atmosphere

Shi Xue Zhou; Qian Qian Zhang; Nai Fei Wang; Zong Ying Han; Wei Xian Ran; Chang Zhen Li; Chao Ding; Peng Bo Li

doi:10.4028/www.scientific.net/AMR.724-725.1021

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 724-725Crystallitic Structure and Thermodynamics of...

Crystallitic Structure and Thermodynamics of Magnesium-Based Hydrogen Storage Materials from Reactive Milling under Hydrogen Atmosphere

Abstract:

Magnesium-based hydrogen storage materials were prepared by reactive milling of magnesium under hydrogen atmosphere with crystallitic carbon, prepared from anthracite coal, as milling aid. The XRD analysis shows that in the presence of 30 wt.% of crystallitic carbon, the Mg easily hydrided into β-MgH₂ of crystal grain size 29.7 nm and a small amount of γ-MgH₂ after 3 h of milling under 1 MPa H₂. The enthalpy and entropy changes of the hydrogen desorption reaction are 42.7 kJ/mol and 80.7 J/mol K, respectively, calculated by the vant Hoff equation from the p-C-T data in 300-380°C.

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Advanced Materials Research (Volumes 724-725)

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1021-1024

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.724-725.1021

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Online since:

August 2013

Authors:

Shi Xue Zhou, Qian Qian Zhang, Nai Fei Wang, Zong Ying Han, Wei Xian Ran, Chang Zhen Li, Chao Ding, Peng Bo Li

Keywords:

Crystallitic Structure, Hydrogen Storage Material, Magnesium, Reactive Milling, Thermodynamic

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