Not exactly.
A capacitor charged to a million volts lost weight.
Bigger and better stacks, at higher voltages, floated.
A supercapacitor, as the term is used in the industry are actually very low voltage with a very high (for a capacitor) power storage. Capacitors are also usually spiral wound and so they will not float, even if they could somehow withstand the ultra-high voltage.
I am no good at links and even worse at names.
I will try to find them, and then write a post about them.
Then, if i can find it later on steemit, i will have a reference.
... right?