Effect of high temperature heat treatment on electrochemical properties of three-dimensional porous graphene

doi:10.12028/j.issn.2095-4239.2019.0147

Abstract

Abstract:

Three-dimensional porous graphene (TDPG) is extensively used as an electrode material for supercapacitors because of its unique three-dimensional structure, high specific surface area, high conductivity, and multilevel pore diameters. However, the specific capacitance per unit area of TDPG is only approximately 5.35 μF/cm², which is considerably lower than the theoretical value of a carbon-based material (~21 μF/cm²). A TDPG with a high specific surface area was selected for this study to improve the specific capacitance per unit area. The effect of high-temperature heat treatment on the conductivity of TDPG was investigated along with the effect of the changes in conductivity on its electrochemical properties. The results denoted that the specific surface area of TDPG was drastically reduced from 2009.8 to 1301.0 m²/g after the high-temperature heat treatment, which was mainly due to the shrinkage of the graphene particles and the reduction of pore volume. The Raman spectrum results demonstrated that high-temperature heat treatment could improve the degree of graphitization of TDPG and increase the conductivity of the electrode materials. Electron impact spectroscopy verified that the equivalent series internal resistance of button supercapacitors with TDPG as the electrode was reduced from 4.0 Ω to 1.4 Ω after heat treatment. The increase in conductivity helped to increase the specific capacity retention rate from 34.8% to 45.2%, indicating that the specific capacitance per unit area of TDPG was considerably improved by high-temperature heat treatment. The study provides a theoretical basis for the controllable preparation of the TDPG electrode materials.

Key words: three-dimensional porous graphene, supercapacitor, high temperature heat treatment, electrochemical properties

CLC Number:

TQ 152

WU Shijia, XIAO Xiang, WANG Chao, ZHONG Guobin, LI Xin, ZHENG Chao, RUAN Dianbo. Effect of high temperature heat treatment on electrochemical properties of three-dimensional porous graphene[J]. Energy Storage Science and Technology, 2020, 9(1): 65-69.

Figures/Tables 5

References 12

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