Ultrahigh volumetric capacitance and cyclic stability of fluorine and nitrogen co-doped carbon microspheres

Highly porous nanostructures with large surface areas are typically employed for electrical double-layer capacitors to improve gravimetric energy storage capacity; however, high surface area carbon-based electrodes result in poor volumetric capacitance because of the low packing density of porous materials. Here, we demonstrate ultrahigh volumetric capacitance of 521 F cm(-3) in aqueous electrolytes for non-porous carbon microsphere electrodes co-doped with fluorine and nitrogen synthesized by low-temperature solvothermal route, rivaling expensive RuO2 or MnO2 pseudo-capacitors. The new electrodes also exhibit excellent cyclic stability without capacitance loss after 10,000 cycles in both acidic and basic…

• NS
  National Science Foundation

  Awards: DMR 1151028, 1151028, 1463083, CMMI 1463083
• NN
  National Natural Science Foundation of China

  Awards: 21101134, 21371149
• DA
  Defense Advanced Research Projects Agency

  Awards: W31P4Q-13-1-0005, W31P4Q
• SR
  Specialized Research Fund for the Doctoral Program of Higher Education of China

  Award: 20131333110010
• DO
  Division of Materials Research

  Awards: 1151028, DMR 1151028
• DO
  Division of Civil, Mechanical and Manufacturing Innovation

  Award: 1463083