Sequential layer-by-layer engineered polypyrrole-activated carbon multilayer films: high-energy composite electrode materials for symmetrical supercapacitors

Y. N. Sudhakar, Sara Méndez Cortiñas, M. Selvakumar

Research output: Contribution to journalArticle


Multilayer polypyrrole (PPy))/Activated carbon (AC) composite electrode was potentiostatically prepared on the surface of stainless steel. Numbers of layers were optimized with p-toluene sulphonic acid, benzene sulphonic acid, and camphor sulphonic acid, as concerned with the accessibility of monomers and high capacitance. Surface morphology of successive deposition of PPy/AC layers were observed using SEM and AFM. The performances of each layer have been studied using cyclic voltammetry and AC impedance spectroscopy. The first layer showed specific capacitance of 345 F g−1, whereas in the multilayered film it was 658 F g−1. Symmetrical supercapacitor were fabricated using multilayer electrodes and compared with single layer electrodes. The properties of supercapacitor showed specific capacitance of 557 F g−1 in a multilayer based supercapacitor, and charge-discharge studies showed excellent stability at the different current density in 0.1M H2SO4. Hence, the study provides evidence and scope for using multilayer with optimized materials and electrochemical conditions.

Original languageEnglish
JournalMaterials Technology
Publication statusPublished - 01-01-2019


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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