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Ji Chen, Kaixuan Sheng, Peihui Luo, Chun Li and Gaoquan Shi Graphene Hydrogels Deposited in Nickel Foams for High-Rate Electrochemical Capacitors Advanced Materials 24

Version of Record online: 12 JUL 2012 | DOI: 10.1002/adma.201201978

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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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