Abstract
The impedance response of electrochemically roughened Pt electrodes with roughness factors ranging from approximately 1.5 to 800 has been determined under experimental conditions involving a penetration depth of the ac signal exceeding the pore depth. Comparative data were obtained for smooth polycrystalline, preferred-oriented, and platinized Pt electrodes in the same solution. The roughness of the interface was modeled as asymmetric truncated conical pores on the electrode, i.e. a limiting approach to the brush-like structure derived from scanning tunneling microscopy imaging for this type of electrode. The impedance data were approximated with a finite transmission line equivalent circuit for a cylindrical pore. The time dependent change in the impedance response correlates with the kinetics of roughness decay resulting from independent measurements.
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