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electronic components

On 12/18/86 David T. Marx wrote:

At SIUC, we're producing capacitors from material that has a capacitance
per mass of 140 F/g. It is a so-called "double layer" capacitor that uses
activated carbon.

1) What makes their C so large? How do R and C depend of frequency?
2) Do chemical reactions occur in them during charging and discharging?

Ludwik Kowalski