Journal
ADVANCED MATERIALS
Volume 24, Issue 33, Pages 4569-4573Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201201978
Keywords
electrochemical capacitors; electrodes; graphene; hydrogels; nickel foam; supercapacitors
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Funding
- National Basic Research Program of China (973 Program) [2012CB933402, 2012CB933404]
- Natural Science Foundation of China [51161120361, 91027028]
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Graphene hydrogel/nickel foam composite electrodes for high-rate electrochemical capacitors are produced by reduction of an aqueous dispersion of graphene oxide in a nickel foam (upper half of figure). The micropores of the hydrogel are exposed to the electrolyte so that ions can enter and form electrochemical double-layers. The nickel framework shortens the distances of charge transfer. Therefore, the electrochemical capacitor exhibits highrate performance (see plots).
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