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Keywords:

  • electrochemical capacitors;
  • electrodes;
  • graphene;
  • hydrogels;
  • nickel foam;
  • supercapacitors
Thumbnail image of graphical abstract

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).