We study slow and nearly reversible processes of reduction, hydride formation and oxidation in Raney-Ni air electrodes in concentrated KOH solutions. A labile ?-NiH phase is formed upon prolonged cathodic polarization under H2 atmosphere. Repeated cathodic/anodic cycles enhance hydrogen intake and induce surface modifications of the Raney-Ni grains.
Electrochemical activation of Raney Nickel air electrodes
VILLA, Marco;VERARDI, Erwin;SALVI, Paolo;NELLI, Paolo;
2008-01-01
Abstract
We study slow and nearly reversible processes of reduction, hydride formation and oxidation in Raney-Ni air electrodes in concentrated KOH solutions. A labile ?-NiH phase is formed upon prolonged cathodic polarization under H2 atmosphere. Repeated cathodic/anodic cycles enhance hydrogen intake and induce surface modifications of the Raney-Ni grains.File allegato/i alla scheda:
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