NOVELTY - An electrode material composition comprises manganese oxide on carbon.    USE - As electrode material composition in the form of coating; as a nanocomposite coating on the substrate to form a nanocomposite coated electrode configuration; in a capacitor such as electrochemical capacitor used in the fields of automobile, aerospace engineering and applications, very large scale integrated circuits (VLSI) technology and micro-electro-mechanical systems (MEMS) (claimed).    ADVANTAGE - The composition is homogeneous and has a particle size of 2-100 (preferably 5-25) nm. The capacitor as single cell assembly has capacitance of 10-100 (preferably 50) mF per cm2 of the surface area of the substrate; has time constant of 0.2-20 (preferably 2) milliseconds for the charge/discharge cycle; can operate effectively at frequencies of 50 Hz to 5000 Hz (preferably 500 Hz); has an equivalent series resistance of 0.1-10 (preferably 1) ohm for efficient operation of the capacitor; yields a maximum power density of 10-70 (preferably 40) kW/kg; and can operate at current densities of 1-100 (preferably about 100) mA cm-2. The capacitor exhibits greater capacitance using composite electrodes having large accessible surface area, high porosity and few micropores and is free of limitations of the prior-art systems. The electrodes used in capacitors, achieves higher operating voltage levels as well as sealing of the completed electrodes. The composite electrodes can be fabricated by a simple, inexpensive and readily repeatable method.    DETAILED DESCRIPTION - An electrode material composition comprises manganese oxide on carbon, of formula Mn1-xO/C (I).    Mn1-xO=monoxide of manganese;    x=0-0.1;    C=carbon.    INDEPENDENT CLAIMS are included for the following:    (1) method (M1) of depositing the electrode material of composition of formula (I), as a nanocomposite coating on the substrate to form a nanocomposite coated electrode configuration, involving: volatilizing the precursor containing manganese and carbon in a vaporizer to obtain the vapors of the precursor; contacting the substrate with the precursor vapors under chemical vapor deposition (CVD) conditions; and adsorption followed by decomposition of precursor molecules on substrate surface to form the nanocomposite coated electrode;    (2) a capacitor having electrode coated with the composition (I);    (3) an electrode coated with composition (I); and    (4) method of coating electrode composition (I), as a nanocomposite coating on the electrode of an electrochemical capacitor in the fields of automobile, aerospace engineering and applications, very large scale integrated circuits (VLSI) technology, micro-electro-mechanical systems (MEMS).