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Electrochemical Characterization of Screen‐Printed Carbon Electrodes by Modification with Chitosan Oligomers
Author(s) -
Lee ShyhHwang,
Fang HungYuan,
Chen WenChang
Publication year - 2005
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.200503339
Subject(s) - electrochemistry , electrode , electron transfer , reaction rate constant , chitosan , analytical chemistry (journal) , redox , materials science , surface modification , kinetics , chemistry , inorganic chemistry , organic chemistry , physics , quantum mechanics
The kinetics on the current amplification of the disposable screen‐printed carbon electrodes (SPCEs) by modification with chitosan oligomers (COs), coupled with the Fe(CN) $\rm{ {_{6}^{3-/4-}}}$ redox system, were characterized with the variation of electron‐transfer rate constant ( k° ) and the electroactive area ( A ea ) at electrode surface. The nonlinear response characteristics of peak currents with increase in Fe(CN) $\rm{ {_{6}^{3-}}}$ bulk concentrations complicated the estimation of A ea in cyclic voltammetric analysis. Upon the modification with COs, the rate constant of SPCEs was not much influenced and the current amplification was characterized with the increase of a better estimated A ea , obtained from electrochemical impedance measurements and verified with the reciprocal of electron‐transfer resistances linearly proportional to the Fe(CN) $\rm{ {_{6}^{3-/4-}}}$ bulk concentrations. It is hereby provided for an evaluation of the carbon based electrodes with modification.