Rapid potential step charging of paper-based polypyrrole energy storage devices

Gustav Nyström, Maria Strømme, Martin Sjödin, Leif Nyholm

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Symmetric paper-based supercapacitor devices containing polypyrrole (PPy)-cellulose composite electrodes and aqueous electrolytes can be charged using either potential step or constant current charging. Potential step charging provides better control of the charging and can result in significantly shorter charging times, enabling charging in 22 s for devices with cell capacitances of 12.2 F when charged to 0.8 V. The paper-based electrode material was compatible with charging currents as large as 5.9 A g -1 due to the rapid counter ion mass transport resulting from the porous composite structure and the thin PPy coatings. The charging times were controlled by the RC time constants of the devices and the cell resistance was found to decrease with increasing electrode area. For small cells, the cell resistance was determined to a large extent by the electrolyte resistance and contact resistances, whereas the resistance of the current collectors dominated for larger cells. The specific cell capacitance was 38.3 F g -1 or 2.1 F cm -2, normalized with respect to the total electrode weight and electrode cross section area respectively, and the devices showed 80-90% capacitance retention after 10 000 potential step charge and discharge cycles. These results, which demonstrate that potential step charging can be advantageous for conducting polymer based energy storage devices, are very encouraging for the development of new up-scalable paper-based energy storage devices.

Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalElectrochimica Acta
Volume70
DOIs
Publication statusPublished - 2012 May 30
Externally publishedYes

Keywords

  • Cellulose
  • Conducting polymer
  • Polypyrrole
  • Potential step charging
  • Supercapacitor

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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