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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
Author(s) -
Gligor Delia,
Craciunescu Izabella,
Popescu Ionel Catalin,
Gorton Lo
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900408
Subject(s) - phenoxazine , methylene blue , electrode , electrochemistry , adsorption , zeolite , materials science , phenothiazine , glassy carbon , carbon fibers , inorganic chemistry , carbon nanotube , redox , chemistry , chemical engineering , cyclic voltammetry , organic chemistry , nanotechnology , composite number , catalysis , composite material , medicine , engineering , pharmacology , photocatalysis
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.