Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 14, Issue 11, Pages 8602-8608Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2014.9942
Keywords
Graphene; Polyethyleneimine; Carbon Aerogel; Supercapacitor
Categories
Funding
- Energy Efficiency and Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Knowledge Economy [2012T100100511]
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Graphene-containing carbon aerogel was prepared by a sol gel polymerization of resorcinol-formaldehyde (RF) method using polyethyleneimine (PEI)-modified chemically exfoliated graphene oxide (GO), and its electrochemical performance as an electrode for supercapacitor was examined. The effect of PEI-modified GO content on the physicochemical and electrochemical properties of graphene-containing carbon aerogel was investigated. For comparison, graphene-free carbon aerogel was also prepared. Among the samples, graphene-containing carbon aerogel prepared using 45 wt% PEI-modified GO solution (CA(45PG)) showed the highest BET surface area (784 m(2)/g) and the largest pore volume (1.71 cm(3)/g) with well-developed porous structure. Electrochemical properties of graphene-containing carbon aerogel and graphene-free carbon aerogel electrodes were measured by cyclic voltammetry, charge/discharge test, and electrochemical impedance spectroscopy in 6 M KOH electrolyte. Various electrochemical measurements revealed that CA(45PG) showed the highest specific capacitance (261 F/g), the lowest equivalent series resistance (0.16 Omega), and superior capacitive behavior. It is concluded that PEI-modified GO content served as an important factor determining the physicochemical properties and supercapacitive electrochemical performance of graphene-containing carbon aerogel.
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