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Rare Metals

, Volume 38, Issue 12, pp 1144–1152 | Cite as

Hydrogen storage thermodynamics and dynamics of La–Mg–Ni-based LaMg12-type alloys synthesized by mechanical milling

  • Yang-Huan ZhangEmail author
  • Peng-Fei Gong
  • Long-Wen Li
  • Hao Sun
  • Dian-Chen Feng
  • Shi-Hai Guo
Article
  • 84 Downloads

Abstract

Nanocrystalline/amorphous LaMg12-type alloy–Ni composites with a nominal composition of LaMg11Ni + x wt% Ni (x = 100, 200) were synthesized by mechanical milling. Effects of Ni content and milling time on the gaseous hydrogen storage thermodynamics and dynamics of alloys were systematically investigated. The hydrogen desorption properties were studied by Sievert apparatus and a differential scanning calorimeter (DSC). Thermodynamic parameters (ΔH and ΔS) for the hydrogen absorption and desorption of alloys were calculated by Van’t Hoff equation. Hydrogen desorption activation energy of alloy hydride was estimated by Arrhenius and Kissinger methods. The increase in Ni content has a slight effect on the thermodynamic properties of alloys, but it significantly enhances the hydrogen absorption and desorption kinetics performance of alloys. Moreover, variation of milling time clearly affects the hydrogen storage properties of alloys. Hydrogen absorption capacity (\(C_{ 1 0 0}^{\text{a}}\)) and hydrogen absorption saturation ratio (\(R_{ 1 0}^{\text{a}}\)) (a ratio of the hydrogen absorption capacity at 10 min to the saturated hydrogen absorption capacity) have maximum values with milling time varying. But hydrogen desorption ratio (\(R_{ 2 0}^{\text{d}}\)) (a ratio of the hydrogen desorption capacity at 20 min to the saturated hydrogen absorption capacity) always increases with milling time prolonging. Particularly, prolonging milling time from 5 to 60 h makes \(R_{ 2 0}^{\text{d}}\) increase from 10.89% to 16.36% for the x = 100 alloy and from 13.93% to 21.68% for the x = 200 alloy, respectively.

Keywords

LaMg12 alloy Mechanical milling Thermodynamics and dynamics Activation energy Hydrogen storage 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51371094 and 51471054).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal ResourcesInner Mongolia University of Science and TechnologyBaotouChina
  2. 2.Department of Functional Material ResearchCentral Iron and Steel Research InstituteBeijingChina

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