I'm doing my research about supercapacitor using neutral aqueous electrolyte.
Recently, I've found there are some researches use activated carbon (e.g: Kuraray) as counter electrode in neutral aqueous electrolyte instead of using a Pt, Cu, titinium, etc as counter electrode.
How can I know if the activated carbon is suitable to use as counter electrode in electrochemical analysis?
I suggest you to repeat some of the experiments performed with activated carbon as CE. If you obtain the same results, then it is suitable.
Anything that is a conductor can be a counter electrode. Note, that each CE will produce some impurities that you may or may not like, so base your choice upon which impurity you can live with.
Pt is good as you mostly produce H2 or O2, but also some Pt ions.
Carbon produces mainly H2 and CO2.
Personally, I like glassy carbon which works good at all pH and does not contribute with any ion to the solution. Clearly, activate carbon would work too, but why make it more complicated that necessary? Glassy carbon can be made into pretty much any shape which makes it very useful.
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