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Graphene Hydrogels Deposited in Nickel Foams for High‐Rate Electrochemical Capacitors
Author(s) -
Chen Ji,
Sheng Kaixuan,
Luo Peihui,
Li Chun,
Shi Gaoquan
Publication year - 2012
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201201978
Subject(s) - materials science , nickel , graphene , capacitor , electrochemistry , electrode , electrolyte , composite number , oxide , graphene foam , chemical engineering , composite material , graphene oxide paper , nanotechnology , metallurgy , voltage , electrical engineering , chemistry , engineering
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).