Characteristics of Hydrogen Storage Alloy Mg2Ni Produced by Hydriding Combustion Synthesis

材料科学技术（英）, 2004, 20(2): 209-212.

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1.Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metal, Beijing 100088, China；Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China

2.Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China

3.Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metal, Beijing 100088, China

4.Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China

5.Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metal, Beijing 100088, China

6.Research Center of Energy Materials and Technology, General Research Institute for Nonferrous Metal, Beijing 100088, China

基金项目: Foundation of the Ministry of Science and Technology, China(2000026405)

Characteristics of Hydrogen Storage Alloy Mg2Ni Produced by Hydriding Combustion Synthesis

Keywords： Hydriding combustion

A high activity and large capacity of hydrogen storage alloy Mg2Ni by hydriding combustion synthesis was investigatedby means of pressure composition isotherms, X-ray diffraction and scanning electron microscopy. The results showedthat the maximum hydrogen absorption capacity of Mg2Ni is 3.25 mass fraction at 523 K, just after synthesis withoutany activation. The relationships between the equilibrium plateau pressure and the temperature for Mg2Ni were lgp(0.1 Mpa)=3026/T+5.814 (523 K≤ T ≤623 K) for hydriding and Igp (0.1 Mpa)=-3613/T+6.715 (523 K≤T ≤623 K) for dehydriding. The kinetic equation is [-ln(1 - α)]3/2 = kt and the apparent activation energy for thenucleation and growth-controlled hydrogen absorption and desorption were determined to be 64.3±2.31 kJ/(mol.H2)and 59.9±2.99 kJ/(moI.H2) respectively.

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Characteristics of Hydrogen Storage Alloy Mg2Ni Produced by Hydriding Combustion Synthesis

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