Electrochemical Quartz Crystal Microbalance Investigation of a Poly(pyrrole)/Sulfated Poly(β‐hydroxyether) Composite Film

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Abstract
The poly(pyrrole)/sulfated poly(β‐hydroxyether) (PPy/S‐PHE) composite film was prepared by galvanostatic electropolymerization of pyrrole in the presence of a persulfated poly(β‐hydroxyether). The redox properties of the PPy/S‐PHE film were investigated with an in situ electrochemical quartz crystal microbalance technique in propylene carbonate solutions of 0.5 mol/liter tetrabutylammonium perchlorate (TBAP) and 0.5 mol/liter . It was found that the PPy/S‐PHE film contains higher amounts of solvent in the reduced state than in the oxidized state. A potential step measurement proved that the charge propagation is faster in the TBAP electrolyte than in the electrolyte. The slower charge propagation in the electrolyte was considered to be a consequence of the lithium S‐PHE salt generated in the film during the reduction having poorer solubility in propylene carbonate.

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