An electrochemical double-layer capacitor for high power applications is being developed at the Paul Scherrer Institute. Glassy carbon was chosen as electrode material because of its inertness, its good bulk conductivity, and the possibility to create a porous layer out of the bulk material. Activation of the glassy carbon was made either electrochemically or in air at high temperatures. The specific resistance and the volumetric density of the porous active layer were determined. Two-electrode capacitors were built using electrochemically or gas phase activated disc-shaped glassy carbon electrodes with 20 cm~2 area. Taking advantage of very thin glassy carbon electrodes, a 5 V multicell bipolar stack was built with a power density of 32.6 kW/l.
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