2017 Annual Meeting
(201aa) Aerosol Synthesis of Highly Porous Carbon with Nanosheet Morphology for Improved Ionic Sorption Capacitance
Carbon materials have been used as the main electrode materials in electrical double layer charge storage because of their high surface area and good conductivity. A lot of efforts have been dedicated to find new carbon materials or synthetic methods to achieve excellent electrochemical performance. In this work, carbon powders with different morphology were synthesized by spray pyrolysis using sucrose/NaHCO3 aqueous solution, and their electrochemical properties were investigated. Poly ethylene glycol (PEG) or polyvinylpyrrolidone (PVP) or TEOS was introduced to the solution of carbon precursor in order to control the morphology and porosity of carbons. Carbon powders synthesized using PEG have the morphology of nanosheet and high surface area of 1256 m2/g, and carbon powder synthesized using PVP show a spherical shape with the surface area of 1167 m2/g. When TEOS was used, the resulting carbons have also spherical shape and the largest surface area of 1617 m2/g. According to CV and EIS measurements, the nanosheet carbon showed much higher specific capacitance (277 F/g) compared with the spherical carbon and the commercial activated carbon (175 F/g). It was clear that the carbon nanosheet is better than other spherical carbons in terms of achieving high ionic sorption capacitance.