Anomalous large capacitances of porous carbons based on protium adsorption.

The capacitances of porous carbon anodes were determined using a Ni(OH) cathode. We found that the capacitances were 300-700 F g and above 3 times those of the carbon anodes prepared by electrical double layer formation, revealing the large capacitances based on protium H adsorption in the presence of highly concentrated KOH solution.