Electrochemical behavior of CoCl2 in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate |
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Authors: | ZHOU Zhou HE De-liang CUI Zheng-dan ZHONG Jian-fang LI Guo-xi |
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Affiliation: | State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China |
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Abstract: | The electrochemical behavior of CoCl2 in 1-butyl-3-methylimidazolium hexafluorophosphate (bmim]PF6) was investigated by cyclic voltammetry. The cyclic voltammograms were obtained from electrochemical measurement under different temperatures, and the reversible behavior for Co2 /Co3 redox couple on glassy carbon electrode in bmim]PF6 was confirmed by the characteristic of the peak currents. The diffusion coefficients (about 10-11m2/s) of Co2 in bmim]PF6 under different temperatures were evaluated from the dependence of the peak current density on the potential scan rates in cyclic voltammograms. It is found that the diffusion coefficient increases with increasing temperature. Diffusion activation energy of Co2 in bmim]PF6 is also calculated to be 23.4kJ/mol according to the relationship between diffusion coefficient and temperature. |
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Keywords: | CoCl2 electrochemical behavior ionic liquid cyclic voltammetry diffusion coefficient diffusion activation energy |
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