Improvement of the capacitive performances for Co–Al layered double hydroxide by adding hexacyanoferrate into the electrolyte

Literature Information

Publication Date 2009-02-10
DOI 10.1039/B814844A
Impact Factor 3.676
Authors

Ling-Hao Su, Xiao-Gang Zhang, Chang-Huan Mi, Bo Gao, Yan Liu


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Abstract

This paper reports on the improvement on the capacitive properties of Co–Al layered double hydroxide (Co–Al LDH) by adding hexacyanoferrate(II) and (III) solely or jointly into 1 M KOH aqueous solution. Owing to the high reversibility, the Fe(CN)63−/Fe(CN)64− ion pair acts as an electron relay at the electrode/electrolyte interface during charge and discharge by coupling in the redox transition of Co(II)/Co(III) in the Co–Al LDH electrode. Electrochemical impedance spectra and Tafel curves provide direct evidences with decreased charge-transfer resistance and increased exchange current density in the alkaline solution containing hexacyanoferrate ions, respectively.

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Physical Chemistry Chemical Physics
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