Ion Diffusion in Three-Dimensional Film Electrodes for ECIS Process

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Abstract Nickel hexacyanoferrate(NiHCF)thin films were synthesized on graphite core substrates by cathodically deposition,and then were assembled as multi-row graphite core(MGRC)film electrodes.The cyclic voltammetry(CV)of the MGRC film electrodes was determined in 1 mol·L-1 KNO_3 solution.The separation(ΔE_p)between the anodic and cathodic peak potentials in the CV curves of MRGC film electrodes with different thickness and spacing was investigated,and the change of CV curves at different scan rates was also measured.Experimental results show that,the excursion of the peak potential of CV curves is caused by ion diffusion in three-dimensional MRGC film electrodes;the ion diffusion resistance in electrode decreases with the increase of thickness of graphite matrix,this leads to the decrease of ΔE_p with the increase of spacing between graphite cores.With the increase of the scan rate,ΔE_p is also increased because of the inner diffusion in the film electrodes.Therefore,the separation degree between the anodic and cathodic peak potentials in the CV curves can be used to analyze the ion diffusion in three-dimensional film electrodes.

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Received 2009-07-15; published 2009-07-15

Cite this article:

YANG Yan-yan,HAO Xiao-gang,ZHANG Zhong-lin,MA Xu-li,LIU Shi-bin.Ion Diffusion in Three-Dimensional Film Electrodes for ECIS Process[J] Chemcial Industry and Engineering, 2009,V26(4): 283-287

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