ac-electrogravimetry study of ionic and solvent motion in polypyrrole films doped with an heteropolyanion, SiMo12O404- - Laboratoire Interfaces et Systèmes Electrochimiques Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2008

ac-electrogravimetry study of ionic and solvent motion in polypyrrole films doped with an heteropolyanion, SiMo12O404-

Résumé

One way to immobilize heteropolyanions on an electrode is to entrap them into a film of conducting polymer. In the present work, a polypyrrole film doped with a Keggin-type heteropolyanion, SiMo12O404-, obtained by electrochemical way was studied. We focus on the charge compensation process, which occurs when the heteropolyanions entrapped into the polymer are reduced or re-oxidized. First, electrochemical quartz crystal microbalance analyses were performed, then, to determine if solvent motion takes place, ac-electrogravimetry measurements were carried out. In fact, in concentrated acidic solution, only protons are involved in the charge compensation. In low acidic solution (pH 3) having a high potassium concentration (0.5 M) both proton and potassium ions are involved whereas at pH 5.2 only potassium motion takes place. These findings are in good agreement with the acido-basic properties of SiMo12O406-. In all cases, no solvent motion was pointed out.

Dates et versions

hal-00630232 , version 1 (07-10-2011)

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Catherine Debiemme-Chouvy, Anne Rubin, Hubert Perrot, Claude Deslouis, Hubert Cachet. ac-electrogravimetry study of ionic and solvent motion in polypyrrole films doped with an heteropolyanion, SiMo12O404-. Electrochimica Acta, 2008, 53 (11), pp.3836-3843. ⟨10.1016/j.electacta.2007.09.041⟩. ⟨hal-00630232⟩
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