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Keywords:

  • Electrodes;
  • Nanocomposites;
  • Nanocrystals, cobalt;
  • Nanowhiskers;
  • Supercapacitors;
  • Zeolites
Thumbnail image of graphical abstract

A Co(OH)2/zeolite nanocomposite with an extraordinarily high specific capacitance is described. Nanometer-sized Co(OH)2 whiskers on the zeolite surface permit high electrochemical accessibility and a fast diffusion rate of electrolyte through the material, resulting in a specific capacitance approaching the theoretical limit. Increasing the Co(OH)2 loading increases whisker growth (see Figure), until bulk Co(OH)2 begins to nucleate and grow in solution (arrows).