Supercapacitor electrodes from activated carbon monoliths and carbon nanotubes

B. N M Dolah, Mohd. Amir Radhi Othman, Mohamad Deraman, N. H. Basri, R. Farma, I. A. Talib, M. M. Ishak

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Binderless monoliths of supercapacitor electrodes were prepared by the carbonization (N2) and activation (CO2) of green monoliths (GMs). GMs were made from mixtures of self-adhesive carbon grains (SACG) of fibers from oil palm empty fruit bunches and a combination of 5 & 6% KOH and 0, 5 & 6% carbon nanotubes (CNTs) by weight. The electrodes from GMs containing CNTs were found to have lower specific BET surface area (S BET). The electrochemical behavior of the supercapacitor fabricated using the prepared electrodes were investigated by electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge (GCD). In general an addition of CNTs into the GMs reduces the equivalent series resistance (ESR) value of the cells. A cell fabricated using electrodes from GM with 5% CNT and 5% KOH was found to have the largest reduction of ESR value than that from the others GMs containing CNT. The cell has steeper Warburg's slope than that from its respective non-CNT GM, which reflect the smaller resistance for electrolyte ions to move into pores of electrodes despite these electrodes having largest reduction in specific BET surface area. The cell also has the smallest reduction of specific capacitance (Csp) and maintains the specific power range despite a reduction in the specific energy range due to the CNT addition.

Original languageEnglish
Article number012015
JournalJournal of Physics: Conference Series
Volume431
Issue number1
DOIs
Publication statusPublished - 2013

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electrochemical capacitors
activated carbon
carbon nanotubes
electrodes
cells
fruits
carbonization
adhesives
nanotubes
oils
capacitance
electrolytes
impedance
activation
slopes
porosity
fibers
carbon
spectroscopy
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Supercapacitor electrodes from activated carbon monoliths and carbon nanotubes. / Dolah, B. N M; Othman, Mohd. Amir Radhi; Deraman, Mohamad; Basri, N. H.; Farma, R.; Talib, I. A.; Ishak, M. M.

In: Journal of Physics: Conference Series, Vol. 431, No. 1, 012015, 2013.

Research output: Contribution to journalArticle

Dolah, B. N M ; Othman, Mohd. Amir Radhi ; Deraman, Mohamad ; Basri, N. H. ; Farma, R. ; Talib, I. A. ; Ishak, M. M. / Supercapacitor electrodes from activated carbon monoliths and carbon nanotubes. In: Journal of Physics: Conference Series. 2013 ; Vol. 431, No. 1.
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