Abstract
New nanoporous carbon-SiO2 composite materials were synthesized from organic raw materials (rice shells) and their electrochemical properties were investigated by cyclic voltammetry in liquid electrolytes (6M KOH or 1M H2SO4). A correlation between specific capacitance and specific surface area was observed. Due to high specific capacitance of 90F/g the carbon materials under study may be regarded as promising electrode materials for electrochemical supercapacitors.
Highlights
Supercapacitors are one of the promising devices for energy storage applications as they can provide higher power density than batteries and higher energy density than conventional dielectric capacitors
The properties of the carbon materials obtained by the two methods strongly differ: The values of the specific surface area (Ss) were determined as 152 and 1020 m2/g for samples of Series 1 and 2, respectively
One can see that values of specific capacitance and the character of A-B-curves depend on the electrolyte type (6 M KOH or 1 M H2SO4)
Summary
Supercapacitors are one of the promising devices for energy storage applications as they can provide higher power density than batteries and higher energy density than conventional dielectric capacitors. Carbon materials with various microtextures are considered as main candidates for supercapacitors in terms of high surface area, interconnected pore structure, controlled pore size, high electrical conductivity and environmental friendliness [1,2,3,4,5,6]. The specific capacitance of the electrode material of the Electrochemical Double Layer Capacitors (EDLC) is known to depend on the specific surface area (Ss) and the pore structure [7]. On the contrary, activated carbons are materials most commonly used in supercapacitors because of their high surface areas (Ss ≥ 1000 m2/g), good adhesion to electrolytes and low cost.
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