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Keywords:

  • hierarchically porous carbon;
  • graphene;
  • sodium-ion batteries;
  • anode materials
Thumbnail image of graphical abstract

A sandwich-like hierarchically porous carbon/graphene (G@HPC) composite is synthesized using a facile ionothermal process. The composite exhibits high specific capacity, remarkable cycling stability, and high-rate capability because of the synergistic effect of low-graphitized porous carbon with hierarchical structure and highly conductive graphene sandwiched between porous carbons.