Supercapacitors using binderless activated carbon monoliths electrodes consisting of a graphite additive and pre-carbonized biomass fibers

N. S M Nor, Mohamad Deraman, M. Suleman, M. R M Jasni, J. G. Manjunatha, Mohd. Amir Radhi Othman, Siti Aisyah Shamsudin

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Varying amounts of graphite powder (0 to 20 wt%) are mixed as an additive with self-adhesive carbon grains, which are produced from pre-carbonized powder derived from the fibers of oil palm empty fruit bunches, a by-product from palm oil mills. The mixtures are treated with KOH and converted into green monoliths (GMs). The GMs are carbonized and activated via a multistep heating profile to produce activated carbon monolith (ACM) electrodes. X-ray diffraction, field emission scanning electron microscopy and nitrogen adsorption-desorption isotherm analysis demonstrate that the addition of graphite influences the structure, microstructure and porosity of the ACM electrode materials. Electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge-discharge studies show that the best frequency response of the electrodes is obtained using 4 wt% of graphite. A tremendous decrease in the equivalent series resistance (~70%) and response time (~87%) leads to an improvement of specific power by 39 % and an 8-fold increase in the maximum operating frequency (from ~0.13 Hz to ~1 Hz). Furthermore, the cells incorporating the electrodes with 4 wt% of graphite retain 50% of their capacitance up to 1 Hz. These findings show that the cheap graphite powder can be a useful additive for preparing supercapacitor electrodes from activated carbon.

Original languageEnglish
Pages (from-to)2520-2539
Number of pages20
JournalInternational Journal of Electrochemical Science
Volume12
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017

Fingerprint

Graphite
Activated carbon
Biomass
Electrodes
Fibers
Powders
Palm oil
Fruits
Electrochemical impedance spectroscopy
Field emission
Cyclic voltammetry
Frequency response
Byproducts
Isotherms
Desorption
Adhesives
Capacitance
Nitrogen
Carbon
Porosity

Keywords

  • Activated carbon monoliths
  • Electrochemical characteristics
  • Graphite
  • Oil palm empty fruit bunches
  • Self-adhesive carbon grains
  • Supercapacitor electrode material

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Supercapacitors using binderless activated carbon monoliths electrodes consisting of a graphite additive and pre-carbonized biomass fibers. / Nor, N. S M; Deraman, Mohamad; Suleman, M.; Jasni, M. R M; Manjunatha, J. G.; Othman, Mohd. Amir Radhi; Shamsudin, Siti Aisyah.

In: International Journal of Electrochemical Science, Vol. 12, No. 3, 01.03.2017, p. 2520-2539.

Research output: Contribution to journalArticle

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