Electrochemical supercapacitor electrodes from sponge-like graphene nanoarchitectures with ultrahigh power density

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DOIResolve DOI: http://doi.org/10.1021/jz301207g
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TypeArticle
Journal titleThe Journal of Physical Chemistry Letters
ISSN1948-7185
Volume3
Issue20
Pages29282933
Subjectelectrochemical capacitor; three-dimensional; graphene; carbon nanotube; microwave
AbstractWe employed a microwave synthesis process of cobalt phthalocyanine molecules templated by acid-functionalized multiwalled carbon nanotubes to create three-dimensional sponge-like graphene nanoarchitectures suited for ionic liquid-based electrochemical capacitor electrodes that operate at very high scan rates. The sequential “bottom-up” molecular synthesis and subsequent carbonization process took less than 20 min to complete. The 3D nanoarchitectures are able to deliver an energy density of 7.1 W·h kg–¹ even at an extra high power density of 48 000 W kg–¹. In addition, the ionic liquid supercapacitor based on this material works very well at room temperature due to its fully opened structures, which is ideal for the high-power energy application requiring more tolerance to temperature variation. Moreover, the structures are stable in both ionic liquids and 1 M H2SO4, retaining 90 and 98% capacitance after 10 000 cycles, respectively.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21268898
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Record identifier242f5d0a-1503-4fc0-840e-6e1ea0a2c0df
Record created2013-11-22
Record modified2016-05-09
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