Abstract
The present communication deals with the hydrogen storage characteristics of C15 laves phase ZrMn2–x Ni x system tailored within the x values of 1·25 to 1·50. Drastic variations in thermodynamics of the hydride phase is observed for any little changes of concentration x within this narrow range. The most promising room temperature hydrogen storage materials are found to be formed within the range of 1·35 to 1·45 where ~ 2·5 to 2·9 H/F.U. can be reversibly stored under the ideal operating conditions. The heat of the reaction is found to be ~ 17 kJ/mol, which means these are promising candidates for stationary and short range mobile applications. The phase structural features and the thermodynamic aspects of all the materials are discussed in detail.
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