Abstract
Cobalt hydroxide carbonate nanorods with an outer diameter of 40-80 nm are synthesized by urea hydrolysis. The electrochemical performance of the cobalt hydroxide carbonate nanorods is investigated by galvanostatic charge and discharge experiments and cyclic voltammetry. It is demonstrated that cobalt hydroxide carbonates are oxidized to cobalt oxyhydroxide during the electrochemical oxidation due to the irreversible reaction process of the Co(III)/Co(II), when it is used as the positive electrode. Importantly, high electrochemical capacity of cobalt hydroxide carbonate nanorods is obtained as a negative electrode, which would be beneficial to improving the electrochemical performance of metal hydride electrodes in the future.
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