Abstract
ABSTRACTDesirable properties of hydrogen storage in materials include mainly, high hydrogen capacity, high number of hydride / dehydride cycles, low temperature of dissociation and microstructural stability. Hydrogen storage can proceed from the gas phase as well as during cathodic charging.The use of nanocrystalline Mg powder without and with 2 mol% Nb2O5 catalyst as an electrode material for electrochemical hydrogen charging processes in a 6M KOH electrolyte was studied. A strong influence of the compaction parameters and the current density but no influence of the catalyst on the hydrogenation behavior was observed. However, a strong influence of the catalyst on the hydrogen overpotential was observed and is assumed to result into a change of the electrochemical surface reaction. The addition of graphite and PTFE to the Mg/Nb2O5electrodes improves the charging kinetic as well as the hydrogen content up to 1 wt.% hydrogen.
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