The assemble symmetric button-type supercapacitor delivered a large energy density of 20.51 dissolved in absolute ethanol) as phosphorous precursor. The CVD process was performed at 750, 800, and 850 ˚C, and the calcined samples were denoted as P-GHCS-750, P-GHCS-800, and P-GHCS-850, respectively. For comparison studies, the sample without TPP was prepared under the same condition, and denoted as HCS-800. The SBET of P-GHCS-750, P-GHCS-800, and P-GHCS-850 was estimated as 337.5, 310.0, and 240.7, respectively. The XPS analysis suggested that the phosphorous atom was covalently incorporated with carbon on the edges of graphitic plane by bonding to one or more oxygen. P-GHCS-800 showed the presence of O, and P heteroatoms with 14.3, and 0.17 at%, respectively. The electrochemical behaviour of P-GHCS materials were studied in a three-electrode configuration using 6 M KOH electrolyte.