A g -1 , while the capacitance was retained about 56% with a 20-fold increase of current density, along with the energy density of 11.9 W h Kg -1 at a power density of 463.6 W Kg -1 . The recorded supercapacitor performances pine nut shell derived porous carbon are attributed to the ultrathin thickness of carbon nanosheets, optimal pore structure, and high content of active nitrogen species. the highest SBET of 2547 m 2 g -1 , and the largest pore volume of 1.2 cm 3 g -1 , which is attributed to the multiple decomposition steps for the KOH as compared to other PEAs. The XPS analysis of APSW samples showed the presence of oxygen content with 11-14 at%, and nitrogen with 0.6-1.2 at%. The lower content of nitrogen was proposed to be due to the evolution of nitrogenous volatile products during the carbonization process. The APSW-KHCO34 sample displayed the highest oxygen content. The electrochemical measurements were performed in three, and two electrode system 2.5 M KNO3 electrolyte, and APSW-KOH4 electrode demonstrated the highest specific capacitance of 242.3 F g -1 at 1 A g -1 . Further, a symmetric device was fabricated using APSW-KOH4 electrode in 2.5 M KNO3 neutral electrolyte, which displayed 83% capacity retention after 15000 continuous charge/discharge cycles, and delivered a specific energy of 25.2 W h Kg -1 when the specific power was 0.9 kW Kg -1 at 1 A g -1 . Moreover, the fabricated device displayed the electrochemical energy storage capability over a 150 h floating time (more than 6 days), suggesting the suitability of the electrode material for enhanced energy storage. The improved electrochemical properties were due to the high SBET, and pore volume, and in particular the KOH-activated sample had over an order of magnitude high number of pores while compared to other porosity enhancing agents.