Why is iron oxide or N doped carbon used as negative electrode (anode) in supercapacitor?

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Madagonda Vadiyar

Dear Deepak Sridhar,

As per my opinion N atom having lone pair of electron and these electron are easily available for the reaction.

Kenichi Shimizu

Hi there, losing electrons sounds like iron oxides are being oxidized, in which case you don't have a supercapacitor. As has been said, N has one lone pair and O has two which make the surface negatively charged. This is important to attract cations to the surface. Needlesstosay, the amount of charge you can get out of a capacitor depends on the ability of electrode surfaces to attract charged ions.