Study on preparation and capacitive properties of three dimensional porous graphene by microwave radiation pyrolysis expansion method
FANG Hua
WANG Li-zhen
GAO Ke-zheng
FANG Wei
CHEN Dan-dan
FAN Hong-yang
PEI Meng-sha
Abstract：Wormlike three dimensional (3D) porous graphene was prepared by microwave radiation pyrolysis expansion method.The morphology and pore structure of the as-prepared samples were characterized by SEM, TEM and N2 adsorption/desorption test.Simulated supercapacitors were assembled to perform electrochemical test by using the as-prepared 3D graphene.And the electrochemical properties were tested by cyclic voltammetry, galvanostatic charge discharge and electrochemical impedance test.The results showed wormlike 3D porous structure was characterized by translucent gossamer-like morphology and had obvious folds belonging to grephene nanosheet.The sample showed a specific surface area of 158.7 m2·g-1 and an average pore size of 11.2 nm.The as-prepared graphene showed excellent electrochemical performances, with a specific capacitance of 161 F·g-1 at 1.25 A·g-1 and 91 F·g-1 when the current increased to 25.00 A·g-1.At 1.25 A·g-1,the capacity retention rate was 90% after cycling charge and discharge 5000 times,which indicated the cycle stability was excellent.
Keywords：three dimensional porous graphenemicrowave radiation pyrolysis expansion methodsuper capacitor
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 8-15 )