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At both electrode, oxidation-reduction reactions take place in an alkaline medium consisting of 30% by weight KOH in water. When charging, Ni(OH)2 at the positive electrode becomes oxidized and the metal hydride becomes reduced. In fact, the hydrogen which was separated from water come to react with the metal in the negative electrode to form MH. On the other hand, the hydroxyl ion ( from water) reacts with Ni(OH)2 at the positive electrode to form NiOOH. Ni now change from +2 to +3.
M + H2O + e = MH + OH
Ni(OH)2 +OH = NiOOH + H2O + e
From equation (1) and (2) there is no net change in electrolyte quantity or concentration over the charge and discharge cycle...
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