4.6 Article

Electrochemical properties of Co(OH)2 powders as an anode in an alkaline battery

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JOURNAL OF MATERIALS SCIENCE
卷 45, 期 14, 页码 3752-3756

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SPRINGER
DOI: 10.1007/s10853-010-4424-5

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The structure and electrochemical properties of beta-Co(OH)(2) powders, synthesized by a chemical precipitation method, were investigated. The results of X-ray diffraction show that a reversible reaction between beta-Co(OH)(2) and hcp Co occurs. The cycling induces a capacity loss of beta-Co(OH)(2) electrode, which is probably attributed to the dissolution of beta-Co(OH)(2) and the subsequent formation of alpha-Co(OH)(2) and CoOOH. The results of electrochemical impedance spectra indicate that the electrochemical discharge process of the as-prepared Co(OH)(2) powders consists of three steps, namely the charge-transfer reactions of Co/CoHx and Co/Co(OH)(2), and the hydrogen diffusion within Co, depending on the depth of discharge.

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