  Supercapacitors are energy storage devices able to deliver electricity with a
high power. They consist of porous carbon electrodes in a concentrated
electrolyte. Charged is stored by the adsorption of ions at the electrode
surface. Nanoporous carbons allow to store more electricity thanks to a
charging mechanism that differs from carbons with larger pores. This mechanism
has recently been uncovered by combining in situ experiments (nuclear magnetic
resonance, electrochemical quartz microbalance) and molecular simulations.
