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Keywords:

  • hollow spheres;
  • metal oxides;
  • porous materials;
  • thermal oxidation
Thumbnail image of graphical abstract

Porous metal oxide hollow architectures are achieved. High-porosity hollow doughnut-shaped and spherical CuO structures are synthesized by thermal oxidation of the corresponding CuS and Cu2S precursors, respectively. A combination of non-equilibrium interdiffusion, volume loss, and gas release are proposed to explain the formation of these porous hollow architectures.