Hello guys (and gals), I have mostly a background in Physics, but I've recently had to get some knowledge on electrochemistry, and more precisely on electrode-electrolyte interface. From "Modern Electrochemistry 2A : Fundamentals of Electrodics" by Bockris I gathered that in the case of a metallic electrode plunged in an aqueous solution (with ultradilute concentration of inorganic ions) with a DC current, I can pretty much model it with a resistance and capacitor in parallel as an equivalent electrical circuit with the resistor being the interfacial resistance and the capacitor being the EDL capacitance. From what I gathered, the capacitance of the EDL of a metallic electrode is generally estimated to be around 20µF/cm² in solutions with millimolar to molar concentration of ions with AC current. Can I safely take this value (or this order of magnitude) for my electrode in deionized water and DC or am I missing an important parameter that can change everything ? Hope I'm making sense :p Cheers !