Abstract
A phosphotungstate-anion (PT)-incorporated polypyrrole (PPy/PT) electrode has been prepared by electrochemical polymerization in water containing both pyrrole and the sodium salt of PT. The PPy/PT electrode showed two redox peaks accompanying electrochromism. The peak at higher potential corresponds to an oxidation–reduction of the incorporated PT, and the other at lower potential corresponds to that of the PPy. The incorporated PT is released from the PPy matrix in neutral aqueous solution (pH 7) and is not released in acidic aqueous solution (pH 2) when the PPy is reduced at < –400 mV vs. SCE. The PPy/PT electrode in neutral solution showed blue, red and yellow colours corresponding to the different redox states of the PPy/PT. However, the PPy/PT electrode in acidic solution showed blue, red and blue–purple. The blue and yellow were assigned to the oxidative and the reductive PPy, respectively. The red and blue–purple were assigned to the PT in the oxidation and the reductive PPy matrix, respectively. The red colour of the PT is a result of interaction between the incorporated PT and the pyrrole moiety. The PPy/PT composite electrode is multielectrochromic.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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