Effect of surface roughness on diffusion-limited charge transfer

Kant, Rama ; Rangarajan, S. K. (1994) Effect of surface roughness on diffusion-limited charge transfer Journal of Electroanalytical Chemistry, 368 (1-2). pp. 1-21. ISSN 0022-0728

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0022-0728(93)03069-2


A theory is developed for diffusion-limited charge transfer on a non-fractally rough electrode. The perturbation expressions are obtained for concentration, current density and measured diffusion-limited current for arbitrary one- and two-dimensional surface profiles. The random surface model is employed for a rough electrode | electrolyte interface. In this model the gross geometrical property of an electrochemically active rough surface -the surface structure factor-is related to the average electrode current, current density and concentration. Under short and long time regimes, various morphological features of the rough electrodes, i.e. excess area (related to roughness slope), curvature, correlation length, etc. are related to the (average) current transients. A two-point Pade approximant is used to develop an all time average current expression in terms of partial morphological features of the rough surface. The inverse problem of predicting the surface structure factor from the observed transients is also described. Finally, the effect of surface roughness is studied for specific surface statistics, namely a Gaussian correlation function. It is shown how the surface roughness enhances the overall diffusion-limited charge transfer current.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:81216
Deposited On:04 Feb 2012 12:39
Last Modified:04 Feb 2012 12:39

Repository Staff Only: item control page