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Anionic Clay Modified Electrode for Detection of Alcohols. An Electrocatalytic Amperometric Sensor
Author(s) -
Ballarin Barbara,
Seeber Renato,
Tonelli Domenica,
Zanardi Chiara
Publication year - 2000
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/(sici)1521-4109(20000401)12:6<434::aid-elan434>3.0.co;2-6
Subject(s) - amperometry , electrode , redox , substrate (aquarium) , steric effects , electrochemistry , chemical engineering , materials science , inorganic chemistry , reference electrode , chemistry , organic chemistry , oceanography , engineering , geology
The mechanism of the electrocatalytic oxidation towards a wide series of alcohols, by an electrode covered with the [Ni/Al–Cl] hydrotalcyte‐like clay, has been analyzed in the different steps it consists of. Such a clay has been reported to be electrically conductive via a mechanism that shows similarities with that of the redox polymers. The overall process occurs in quite a complicated physical system that is completely different both from a classical electrode‐solution one and from an electrode covered with a film of heterogeneous catalyst. By varying the characteristics of the substrate, in terms of steric hindrance and dipole moment of the molecule, the factors affecting the redox mediator‐substrate reaction have been studied. The concentration ranges where the amperometric response varies linearly have been determined for the different substrates considered.