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Keywords:

  • hierarchical structures;
  • mesoporous structures;
  • nanoparticles;
  • pseudocapacitor;
  • energy storage;
  • electrochemistry
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A novel 3D hierarchical mesoporous Co3O4 structure assembled by ultrathin nanoflakes (2.4 nm in thickness) has been successfully developed. Combining a high specific surface area (183.8 m2 g–1), mesoporosity, and a stable 3D hierarchical structure render the as-synthesized 3D Co3O4 the properties of a promising active material for high-rate pseudocapacitors with high specific capacitance, excellent rate capability, and durable long-term stability.