Faradaic admittance and adsorption: a diffusion model

Rangarajan, S. K. ; Doss, K. S. G. (1962) Faradaic admittance and adsorption: a diffusion model Journal of Electroanalytical Chemistry, 4 (4). pp. 237-241. ISSN 0022-0728

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002207...

Related URL: http://dx.doi.org/10.1016/0022-0728(62)80050-3


When diffusion alone is the mode of mass transfer, expressions derived previously for the elements of the faradaic admittance predict that its phase angle cannot exceed π/4. Several systems show the possibility of the phase angle being greater than π/4. Laitinen and Randles had suggested that such anomalous behaviour can be explained by taking into account the correction for the contribution of the adsorbed reactants. A different model, based on diffusion, is presented in this paper and shows how the conclusions of Laitinen and Randles(e.g., the elements of the equivalent circuit, Ra and Ca, which are independent of frequency) can be obtained through this model as well. A detailed comparison between the parameters used in the two different models is made. Results for a generalised diffusion model are cited.

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ID Code:9829
Deposited On:02 Nov 2010 10:43
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