Synthesis of porous graphene/activated carbon composite with high packing density and large specific surface area for supercapacitor electrode material
By Chaocan Zheng, Xufeng Zhou, H. Cao, Guohua Wang, Zhaoping Liu. 2014
378 citations recorded by the source corpus.
A simple method has been developed to prepare graphene/activated carbon (AC) nanosheet composite as high-performance electrode material for supercapacitor. Glucose solution containing dispersed graphite oxide (GO) sheets is hydrothermally carbonized to form a brown char-like intermediate product, and finally converts to porous nanosheet composite by two-step chemical activation using KOH. In this composite, a layer of porous AC coats on graphene to from wrinkled nanosheet structure, with length of several micrometers and thickness of tens of nanometer. The composite has a relatively high packing density of similar to 0.3 g cm(-3) and large specific surface area of 2106 m(2) g(-1), as well as containing plenty of mesopores. It exhibits specific capacitance up to 210 F g(-1) in aqueous electrolyte and 103 F g(-1) in organic electrolyte, respectively, and the specific capacitance decreases by only 5.3% after 5000 cycles. These results indicate that the porous graphene/AC nanosheet composite prepared by hydrothermal carbonization and chemical activation can be applied for high performance supercapacitors. (C) 2014 Elsevier B.V. All rights reserved.
Subfields: Biomaterials, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/37827c85f6b6c895bc6c58c237bd366e79808e06