Mesoporous carbons were synthesized using thermoplastic phenolic resin(PF) as carbonaceous precursor and magnesium citrate as template precursor.Pore structure was determined as ink-bottle-like geometry through TEM,N2 adsorption analysis combined with TG curves.The porous carbons prepared were then applied as electrode material for electric double-layer capacitors.The capacitor performance was examined in 30 wt% KOH aqueous solution by cyclic voltammetry and galvanostatic charge/discharge measurements.The carbon prepared with MgO/PF mass ratio of 8/2 had a BET surface area of 1920 m2 g-1 and exhibited a capacitance of 220 F g-1 at a current density of 50 mA g-1.Besides,the carbon with the ratio of 4/6 had the optimize proportion of mesopores,which ensures its good rate performance that up to 98.3%,expressed as the ratio of the capacitance measured at 1000 mA g-1 against that at 50 mA g-1.
LIU WenJieWANG ChengYangWANG JiuZhouJIA FanZHENG JiaMingCHEN MingMing
Organic salts such as spiro-(1,1')-bipyrrolidinium tetrafluoroborate([SBP][BF4]) dissolved in liquid acetonitrile(ACN) are a new kind of organic salt solution,which is expected to be used as an electrolyte in electrical double layer capacitors(EDLCs).To explore the physicochemical properties of the solution,an all-atom force field is established on the basis of AMBER parameter values and quantum mechanical calculations.Molecular dynamics(MD) simulations are carried out to explore the liquid structure and physicochemical properties of [SBP][BF4] electrolyte at room temperature.The computed thermodynamic and transport properties match the available experimental results very well.The microscopic structures of [SBP][BF4] salt solution are also discussed in detail.The method used in this work provides an efficient way of predicting the properties of organic salt solvent as an electrolyte in EDLCs.
