Graphene hydrogels deposited in nickel foams for high-rate electrochemical capacitors.
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).
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. of China.
Ji
J
Chen
Kaixuan
K
Sheng
Peihui
P
Luo
Chun
C
Li
Gaoquan
G
Shi
D025802:Electric Capacitance; D004563:Electrochemistry; D006108:Graphite / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*
D020100:Hydrogels; D006108:Graphite; D009532:Nickel