Novel synthesis of N-doped graphene quantum dot as conductive agent for carbon based supercapacitors

Yu Cheng Hsiao, Jau Lian Hung, Subbiramaniyan Kubendhiran, Sibidou Yougbaré, Lu Yin Lin, Yung Fu Wu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Conductive agent can increase conductivity and construct pore structure in supercapacitor (SC) electrode as clean renewable energy. Carbon black (CB) is common conductive agent but its zero dimension hinders efficient charge-transfer conductive bridge. Combining CB with other carbon materials can possibly solve this issue. Graphene quantum dot (GQD) with high hydrophilicity and stable doping features is easier and cheaper to develop. Previous synthesis of GQD requires complex process and lacks large-scale production. In this study, novel one-step thermal treatment was provided to synthesize N-doped GQD. Citric acid and urea ratios were varied to synthesize N-doped GQD with different N-doping extents and electrical conductivities. CB and GQD mixtures, GQD and CB are used as conductive agent for fabricating SC electrodes. Activated carbon electrode with CB and GQD mixture shows the highest specific capacitance (CF) of 241.4 F/g at 20 mV/s, while electrodes without conductive agent and with CB conductive agent respectively shows CF of 41.5 and 108.6 F/g, due to more functional groups, defects, hydrophilic sites and electrochemical surface area of the former case. Symmetric SC with CB and GQD shows a maximum energy density of 10.54 Wh/kg at 550 W/kg, and CF retention of 85% and Coulombic efficiency of 80% after 5000 charging/discharging cycles.

Original languageEnglish
Article number105902
JournalJournal of Energy Storage
Publication statusPublished - Dec 2022


  • Carbon black
  • Conductive agent
  • Graphene quantum dot
  • Nitrogen doping
  • Supercapacitor
  • Thermal treatment

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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