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Influence of the Electrode Material on the Electrochemical Behavior of Carbon Paste Electrodes Modified with Meldola Blue and Methylene Green Adsorbed on a Synthetic Zeolite

✍ Scribed by Delia Gligor; Izabella Craciunescu; Ionel Catalin Popescu; Lo Gorton

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 185 KB
Volume: 22
Category: Article
ISSN: 1040-0397
DOI: 10.1002/elan.200900408

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✦ Synopsis

Abstract

Carbon paste electrodes modified with a phenoxazine derivative, Meldola blue, and a phenothiazine derivative, methylene green, both strongly adsorbed on a synthetic zeolite were investigated using either glassy carbon powder (Sigradur K, SK) or single‐walled carbon nanotubes (SWCNT) as conductive electrode material. In the case of SWCNT based electrodes, the formal potential of both mediators was pH dependent, as expected for a redox process involving proton transfer. In contrast, the formal potential of both mediators of SK based modified electrodes was practically insensitive to pH. This behavior is discussed in terms of interactions existing in the heterogeneous system mediator‐zeolite‐electrode material.

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