I mentioned this over in Russell's battery thread, but...

Is it within the reach of "amateur science" to make your
own electrolytic or supercapacitor?  An electrolytic is
more-or-less anodized aluminum foil with a slightly exotic
electrolyte, and the early supercapacitors were based on
activated charcoal (which is somewhat available and I think
even almost home-manufacturable, for somewhat poor values
of "activated.")

BillW

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