Journal
ELECTROANALYSIS
Volume 22, Issue 5, Pages 509-512Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200900408
Keywords
Zeolite modified carbon paste electrodes; Glassy carbon powder; Carbon nanotubes; Phenoxazine; Phenothiazine; Nanotubes; Zeolites
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Funding
- The Romanian Government, CNCSIS [ID_512]
- The Swedish Research Council
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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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