Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/67455
Title: Immobilisation of phosphomolybdic (PM) acid by Nafion and the electrochromism of the resulting PM-Nafion films
Authors: Pan, B.H.
Lee, J.Y. 
Issue Date: Feb-1997
Source: Pan, B.H.,Lee, J.Y. (1997-02). Immobilisation of phosphomolybdic (PM) acid by Nafion and the electrochromism of the resulting PM-Nafion films. Journal of Materials Chemistry 7 (2) : 187-191. ScholarBank@NUS Repository.
Abstract: The electrochromism of phosphomolybdic (PM) acid in solution and immobilised in Nafion has been investigated. Immobilisation made use of two simple dip-coating techniques which allowed easy modification of the electrochemical activity of the composite films. PM in solution changed from light yellow to blue upon reduction, whereas immobilised PM showed a change from pale yellow to light blue under identical conditions. Electrostatic repulsions between PM anions and negatively charged sulfonic groups in Nafion limited the amount of PM that could be molecularly dispersed in Nafion. This, coupled with the poor conductivity inherent in the Nafion matrix, resulted in suppressed electrochemical reactivities for the composite films. Despite these results, UV-VIS absorption spectra showed marked differences in light absorption between the pristine and coloured forms of immobilised PM, indicative of application potentiality.
Source Title: Journal of Materials Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/67455
ISSN: 09599428
Appears in Collections:Staff Publications

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