Pencil graphite/polypyrrole supercapacitors: The structural and chemical changes of the electrodes after capacitive measurements


Materials Chemistry and Physics, vol.295, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 295
  • Publication Date: 2023
  • Doi Number: 10.1016/j.matchemphys.2022.127073
  • Journal Name: Materials Chemistry and Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Electrochemical impedance, Mott-Schottky, Pencil graphite, Polypyrrole, Supercapacitor
  • Bursa Uludag University Affiliated: Yes


© 2022 Elsevier B.V.Polypyrrole (PPy) films were electropolymerized on pencil graphite electrodes (PGE). It is usual that for supercapacitor applications composite materials containing conductive polymers and low dimension carbon are being studied. PGE was employed as a substrate and also a source of carbon contributing to the capacitive effect. By this, a specific capacitance of 695 F/g, and a stability of 77% after 1000 times cycled was obtained. Moreover, a cheap, rapid and easy way to fabricate supercapacitor electrodes was found. A PGE/PPy symmetrical supercapacitor was produced. The energy and power density values were calculated as 38.76 Wh/kg and 227.99 W/kg. The cycles showed remarkable charge/discharge capacity. Parallel connected several electrodes could enlighten an LED for a while.