US EPA

4274016 

Journal Article 

Preparation of carbon microspheres. by inverse emulsion polymerization and their electrochemical performance as electrode materials of supercapacitors 

Feng Chong; Zhao Jiang-hong; Han Bai-xin; Sun Ya-hui; Wang Jian-long; Li Kai-xi 

2016 

Unk 

Xinxing Tancailiao
ISSN: 1007-8827 

31 

6 

600-608 

WOS:000391417400006 

Porous phenolic resin based carbon microspheres were prepared by inverse emulsion polymerization, followed by carbonization at 800 degrees C for 1 h and KOH activation at 800 degrees C for 1 h with a KOH/coke mass ratio of 4. Thermal setting phenolic resin in ethanol was used as one phase and a mixture oil of silicone oil and heat transfer oil as the other phase in the inverse emulsion polymerization. The performance of the porous spheres as electrode materials in supercapacitors was investigated. Results indicate that the size and morphology of the spheres are mainly determined by the mass ratio of silicone oil to heat conduction oil, the mass ratio of alcohol to phenolic resin and the stirring speed. The heat transfer oil with alkyl benzene size chains interacts with phenolic resin by a pi-pi interaction, which is beneficial for the formation of microspheres. The porous spheres prepared under the optimum conditions have a high specific capacitance of 206 and 134 F/g at current densities of 1 A/g and 20 A/g, respectively in a 6 M KOH electrolyte. The good capacitive and rate performance can be ascribed to the high specific surface area and the pore structures. 

Phenolic resin; Inverse emulsion polymerization; Carbon microsphere; Capacitive performance