Abstract: A composite with high energy storage capacity for use in energy storage devices includes graphene and mesoporous graphitic carbon nitride (mc@g-C3N4). The graphitic carbon nitride is coated on mesoporous carbon (mc@g-C3N4) at a concentration ranging from 3% to 33%. The graphitic carbon nitride is obtained from condensation of mesoporous carbon and urea or a precursor thereof. Electrodes may be prepared from the composite. High energy high power storage devices such as the Electric Double Layer Capacitor (EDLC) may be fabricated with these electrodes.

Abstract: The present invention discloses composite with high energy storage capacity in energy storage devices comprising graphene, mesoporous graphitic carbon nitride (mc@g-C3N4) and to the process for preparation thereof. The present invention further discloses electrodes employing the said compositie and fabrication of high energy high power storage devices such as the Electric Double Layer Capacitor (EDLC) with these electrodes.