Original scientific paper

Electrochemical Behavior of SWCNT-TPLF Electrode Compared to SWCNT-coated GCE and GE Electrodes

M. Muzibur Rahman
Il C. Jeon

Abstract

Redox reaction [Fe(CN)6]3– / [Fe(CN)6]4– has been studied with a Single-Walled Carbon Nanotube
(SWCNT)-coated Glassy Carbon Electrode (GCE), SWCNT-coated Gold Electrode (GE)
and a lab-made SWCNT-TPLF (SWCNT-Thin-Paper-Like-Film) Electrode. The SWCNT-modified
electrode has shown a well-defined redox peak compared to bare electrodes. Cyclic voltammetry
was used in 50.0 × 10–3 M aqueous solution of KCl containing K4[Fe(CN)6] to obtain
information on both the capacitive background and electron transfer from the faradaic reaction
of the redox species. The capacitance gives insight into the effective surface area (including
both the exterior and interior surfaces within the coated and TPLF electrodes) as well as the
pseudocapacitance due to faradaic reactions of surface bonded oxides. Among the three types
of electrodes, the SWCNT-TPLF electrode showed the largest volume specific capacitance,
consistent with its highest carbon nanotube packing density and largest effective surface area.
This indicates that the carbon nanotube working electrode (whether coated or film electrode)
behaves as a three-dimensional electrode. The redox reaction of [Fe(CN)6]3– / [Fe(CN)6]4– was
found to occur not only at the outer surface of the carbon nanotube but also at the interior
surface of the thin paper like nanotube electrode.

Keywords

SWCNT-TPLF electrode; SWCNT-coated GCE; SWCNT-coated GE; cyclic voltammetry; charge capacitance; surface area

Hrčak ID:

12826

URI

https://hrcak.srce.hr/12826

Publication date:

11.3.2007.

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