Abstract
In this paper, the electrochemical current rectification phenomenon exhibited at an electrochemical interface constituted by a glassy carbon electrode covered with a bilayer of polymer films is discussed. The authors have shown that Methylene Blue (MB) redox species can be confined to a very thin insulating polymer film formed from orthophenylene diamine. The poly(opd) film exhibited excellent blocking properties to redox molecules in solution. On the other hand, the insulating poly(opd) film trapped with MB could mediate electron transfer between the redox molecules in solution and the electrode. Further, a second polymeric layer (Nafion film) trapped with ferrocene redox species was formed as the outer layer over the inner poly (opd) film containing MB. This bilayer-modified electrode, due to the significant difference in the redox potentials of the MB and ferrocene species immobilized in the inner and outer layers, respectively, exhibits unidirectional current flow and the results of the voltammetric investigations on the modified electrodes are described in this communication.
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The authors are thankful to the Department of Science and Technology, Government of India, New Delhi for their financial support.
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Berchmans, S., Usha, S., Ramalechume, C. et al. Polymer-based bilayer interfaces for electrochemical rectification. J Solid State Electrochem 9, 595–600 (2005). https://doi.org/10.1007/s10008-004-0606-x
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DOI: https://doi.org/10.1007/s10008-004-0606-x