Abstract
We describe measurements of the complex admittance of the interface between a class of fractal electrodes and electrolytic solutions over the frequency range 100 Hz to 40 kHz. The electrodes are grown by the diffusion-limited electrodeposition of copper from aqueous solution and have fractal dimensions comparable to those obtained for computer simulations of the diffusion-limited aggregation model, Df = 2.5. The admittance measured at various stages of the electrodeposit's growth displays constant phase angle (CPA) scaling with frequency. This behavior appears to have its origins in the disordered geometry of the system, although our measurements do not agree with the scaling predictions of theories for fractal blocking electrodes.
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