Supercapacitor and Room Temperature H, CO2 and CH4 Gas Storage Characteristics of Commercial Nanoporous Activated Carbon

This paper discusses the electrochemical energy storage and room temperature hydrogen, methane and carbon dioxide adsorption/desorption behaviour of commercial nanoporous activated carbon having a specific BET surface area 1007 m(2) g(-1) and pore volume 0.371 cm(3) g(-1). The electrochemical energy storage behaviour of activated carbon was determined from its capacitive performance using standard three and two-electrode cells. The specific capacitance (C-S) of the sample determined using a three-electrode cell is 138 F g(-1) at 0.1 A g(-1) with the capacitance loss of 1% after 2000 charge/discharge cycles. Whereas, CS determined using a two-electrode cell is 98.8 F g(-1) at 0.2 A g(-1) with the capacitance loss of 3% after 5000 charge/discharge cycles. The energy and power densities of two-electrode cell supercapacitor is 19.76 Wh kg(-1) and 3.77 kW kg(-1), respectively. The sample exhibits gaseous uptake capacities of 0.23 wt% H-2, 8.52 wt% CH4 and 37.25 wt% CO2 at similar to 50 atm/293 K.