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KMID : 1059519950390040294
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Journal of the Korean Chemical Society
1995 Volume.39 No. 4 p.294 ~ p.300
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Characteristics of Enhanced Current by Polypyrrole under Illumination
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Chae Won-Seok
Jang Yeah-Suk
Lee Beom-Gyu
Kim Kang-Jin
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Abstract
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The photoelectrochemical behavior of polypyrrole films on Pt, glassy-C and indium tin oxide(ITO) under illumination was studied in aqueous solution containing a redox couple such as I-/I2 or Fe(CN)64-/Fe(CN)63-. Polypyrrole(PPy) was coated on Pt, glassy-C and ITO electrodes using electrochemical polymerization of pyrrole by potentiostatic method. Illumination of the PPy film results in the increase of cathodic and anodic currents at redox potentials of the redox species. These enhanced currents are caused both by the semiconductor characteristics of PPy and by the photothermal acceleration of redox reaction at PPy-electrode surface, and are dependent on the pH of redox solutions and the dopants in PPy.
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