Which metals apart from platinum, tantalum, gold etc can be used as current collector with 1M H2SO4 as electrolyte in symmetric Supercapacitors?
and in what voltage range?
Is silver or aluminium foil, or silver coated nickel disc a good choice?
Hi Hashim,
The reason why we are using platinum, gold etc for current collector is because they are most noble in nature.
Here I have mentioned some of the noble metals according to their resistance for corrosion.
From the options you have given, better you can use silver rather than Al. Because Al comes after Ag in its resistance for corrosion. For more details, I have attached a link here...
https://en.wikipedia.org/wiki/Galvanic_series
The problem with using H2SO4 as electrolyte in supercaps is that it is highly corrosive. Hence low cost collectors like stainless steel or nickel can not be used with H2SO4. Companies like NEC which produce H2SO4 based capacitors use conductive carbon but it is also expensive in my opinion. If you want to use low cost and easily available collectors, it would be better to shift to KOH or salt electrolytes (Na2SO4 or Li2SO4). You can then use stainless steel or nickel current collectors with any of them. The operating voltage for aqueous KOH is similar to what it is in H2SO4, up to 0.8 V but with salt electrolytes you can easily polarize the cell up to 1.5 V. Of course your choice of electrolyte should be in accordance with your electrode material.
good luck
All answers are explained. Plz follow this and I hope you will get.
Sujoy Sarkar
can you please share references of supercapacitor using Al foil? I couldn't find it.
You can use graphite electrode but H2SO4 always creates problem instead use kcl or koh with 1.0 v
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