On: A supercapacitor made from cement

[_ihaque]

Energy in a capacitor is (1/2)CV^2 - so 12x the voltage would be 144x the energy.

[jonsen → _ihaque]

If they can keep C at the same value in a higher voltage version.

[marcosdumay → jonsen]

Yep. Trivially, one would expect the capacitance to decrease linearly with voltage.

There's also a question about current leakage.