High yield activated porous coal carbon nanosheets from Boropukuria coal mine as supercapacitor material: Investigation of the charge storing mechanism at the interfacial region

Here, we report a porous carbon material derived from coal of Boropukuria, Dinajpur, Bangladesh that has been used for fabricating high-power supercapacitor. The activated coal carbon nanosheets (ACCNs), prepared using simple pyrolysis, had a high yield (60%), and contained O and N heteroatoms, along with a hierarchical porous network of micro, meso, and macro pores. Surface morphology, elemental composition, crystallite size, and porous network of the ACCNs have been studied using FESEM, XPS, Raman, and N2 adsorption-desorption analysis. An operating potential window of 1.1 V was obtained in 1 M KCl neutral electrolyte solution. At 2.25 A/g the calculated specific energy was ~ 39.04 Wh/kg, along with a high specific power of ~ 1237.5 W/kg. The ACCNs material was able…