Original Paper

Journal of Solid State Electrochemistry

, Volume 17, Issue 8, pp 2293-2301

First online:

Synthesis of micro- and mesoporous carbon spheres for supercapacitor electrode

  • Xiaomei MaAffiliated withDepartment of Chemistry, Tongji University
  • , Mingxian LiuAffiliated withDepartment of Chemistry, Tongji University Email author 
  • , Lihua GanAffiliated withDepartment of Chemistry, Tongji University Email author 
  • , Yunhui ZhaoAffiliated withDepartment of Chemistry, Tongji University
  • , Longwu ChenAffiliated withDepartment of Chemistry, Tongji University

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Micro- and mesoporous carbon spheres (MMCSs) are synthesized by the polymerization of colloidal silica-entrapped resorcinol/formaldehyde in the presence of ammonia as catalyst, followed by carbonization, sodium hydroxide (NaOH) etching to remove silica template, and potassium hydroxide (KOH) activation. The morphology and microstructure are characterized by scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption. The results show that a typical sample (denoted as MMCS-3) unites the characteristics of regular spherical shape (uniform diameters of 500 nm), high specific surface area (1,620 m2 g−1), large pore volume (1.037 cm3 g−1), and combined micropores and mesopores (11.0 nm), which endows MMCS-3 good electrochemical performance. MMCS-3 as supercapacitor electrode shows a specific capacitance of 314 F g−1 under a current density of 0.5 A g−1 and low internal resistance of 0.2 Ω in 6 M KOH aqueous solution. The electrochemical capacitance still retains 198 F g−1 at a high current density of 10 A g−1. After 500 cycle numbers of galvanostatic charge/discharge at 0.5 A g−1, MMCS-3 electrode still remains the specific capacitance of 301 F g−1 with the retention of 96 %. This study highlights the potential of well-designed MMCSs as electrodes for widespread supercapacitor applications.


Micromesoporous carbon sphere Synthesis Electrode Supercapacitor Electrochemical performance