Answer to my own question, in my recently published article:
https://pubs.rsc.org/en/content/articlehtml/2020/ma/d0ma00023j
Previously my question was:
I have read quite a few articles on pseudocapacitors, however, I still haven't found a convincing mechanism explaining the electrochemical charge storage for the hydrous ruthenium electrode in alkaline solution. Well, for acidic solutions we have equations from Conway (the father of supercaps.). In case you want to refer them, you can read page 270 onwards. In alkaline solution, lets say, KOH, will K+ intercalate into the lattice to counterbalance the charge? Isn't hydrated K+ big to intercalate? If yes, what are the probable reaction and the mechanism? Or is it still H+ intercalation, even with alkaline electrolytes?
For simplicity, let's assume there is no variation in the hydrous content, and all the reaction is at the surface and is quick (thus can behave like pseudocapacitors).
hopefully waiting for some valuable inputs :)
regards
Deepak Sridhar,
You raised an interesting point. The first thing that we need to be clear is whether the charge storage of hydrous RuO2 is proton "intercalation." As far as I know, and also you have noted, the redox reaction of hydrous RuO2 proceeds on the surface of RuO2 and should not involve ion intercalation. I would use the word "protonation."
If we agree on this wording, the interaction of K+ and RuO2 could be possible, because even though hydrated K+ is bigger than H+, their charge storage processes are not intercalation that needs to consider steric hindrance.
Article Carbon nano-fiber forest foundation for ruthenium oxide pseu...
- Badges
- Science topic