Implications of layer-by-layer electrodeposition of polypyrrole from a solution of the same composition for ion transport in the polymer electrode
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- 作者：Anna K?pas ; Maria Grzeszczuk ; maria@wchuwr.chem.uni.wroc.pl
- 关键词：Polypyrrole ; Layer-by-layer electrodeposition ; Bulk and interfacial ion transport ; CA ; CV ; EQCM ; EIS
- 刊名：Journal of Electroanalytical Chemistry
- 出版年：2005
- 出版时间：15 August 2005
- 年：2005
- 卷：582
- 期：1-2
- 页码：209-220
- 全文大小：336 K
文摘
Layer-by-layer electrodeposition of thin polypyrrole films and the charge and mass transport in the resulting multilayer polypyrrole electrodes were studied using electrochemical methods: chronoamperometry, cyclic voltammetry, quartz crystal microbalance, impedance spectroscopy. The polypyrrole/aqueous sodium hexafluoroaluminate and polypyrrole/aqueous sodium chloride systems were investigated. Polypyrrole electrodes of sub-¦Ìm total thickness were studied mostly.
It was shown that the multilayer structure of the polypyrrole electrode results in a hindrance of charge and mass transport between the sublayers of polypyrrole prepared from a solution of the same composition. The resistance to ion transport across the polymer|polymer interface causes slower ion diffusion in the multilayer polypyrrole electrode as compared to the single-layer electrode. The redox capacitances of both structures are similar. Current traces of potentiostatic layer-by-layer deposition differ significantly for nucleation and growth of polypyrrole on polypyrrole as compared to polypyrrole on gold.