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High Energy Density Supercapacitor Based on a Hybrid Carbon Nanotube–Reduced Graphite Oxide Architecture
Author(s) -
Jha Neetu,
Ramesh Palanisamy,
Bekyarova Elena,
Itkis Mikhail E.,
Haddon Robert C.
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201100697
Subject(s) - supercapacitor , materials science , ionic liquid , carbon nanotube , electrolyte , capacitance , graphite , graphite oxide , power density , oxide , chemical engineering , tetrafluoroborate , carbon fibers , electrode , specific energy , nanotechnology , porosity , composite material , composite number , organic chemistry , power (physics) , catalysis , chemistry , metallurgy , physics , quantum mechanics , engineering
A high energy density supercapacitor device is reported that utilizes hybrid carbon electrodes and the ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF 4 ) as an electrolyte. The hybrid electrodes are prepared from reduced graphite oxide (rGO) and purified single‐walled carbon nanotubes (SWCNTs). A simple casting technique gives the hybrid structure with optimum porosity and functionality that provides high energy and power densities. The combination of SWCNTs and rGO in a weight ratio of 1:1 is found to afford a specific capacitance of 222 F g −1 and an energy density of 94 Wh kg −1 at room temperature.