Dołączył: 30 Paź 2020
|Wysłany: Czw Lis 19, 2020 08:01 Temat postu: High yield activated porous coal carbon nanosheets
|High yield activated porous coal carbon nanosheets from Boropukuria coal mine as supercapacitor material: Investigation of the charge storing mechanism at the interfacial regioncoal activated charcoal
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 to retain specific energy of ~ 22.92 Wh/kg and specific power of ~ 41,250 W/kg at a high current density of 75 A/g. The contribution of capacitive (non-Faradic), and diffusion intercalation (Faradic) current has been investigated using Cottrell and Dunn's equations. The ACCNs material was used for making a coin cell prototype supercapacitor device and tested with a light emitting diode (LED).
Thin layer hierarchically porous activated coal carbon nanosheet (ACCNs) material with high yield (~ 60%) has been prepared using pyrolysis method.
Operating potential window of 1.1 V was obtained in aqueous neutral 1 M KCl electrolyte solution.
ACCNs material retained specific energy of ~ 22.92 Wh/kg and specific power of ~ 41,250 W/kg at a current density of 75 A/g.
Contribution of capacitive and diffusion current on the capacitance has been investigated through Cottrell and Dunn's equations.
Ion storage mechanism has been discussed based on electrochemical double layer formation and pseudocapacitance.