Porous electrodes offer a high surface area to volume or weight ratio which is highly beneficial to a number of energy generation or storage devices. Transmission lines are heavily used in modeling in Electrochemical Impedance Spectroscopy (EIS) experiments where porous systems are employed.
Batteries, supercaps, fuel cells, and [dye sensitized] solar cells have some similar characteristics: they are low impedance devices with large surface areas often made using highly porous electrodes. So similar techniques are useful and similar issues can arise.
This application note discusses theory and practice of transmission lines.
Transmission lines are regularly used to model the impedance spectra of porous systems.