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Quantitative in Situ Measurement of Ion Transport in Polypyrrole/Poly(styrenesulfonate) Films Using Rotating
C A Salzer1, C M Elliott, S M Hendrickson
1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523.
Analytical Chemistry
|June 14, 2011
Summary
This study introduces a rotating ring-disk electrode voltammetry method for measuring ion transport in conducting polymer films. The technique reveals that kinetic factors, specifically cation size, drive preferential doping in polypyrrole/poly(styrenesulfonate) films.
Area of Science:
- Electrochemistry
- Materials Science
- Polymer Science
Background:
- Conducting polymers like polypyrrole/poly(styrenesulfonate) (pPy(+)/pSS(-)) are crucial in various electronic applications.
- Understanding ion transport within these films is essential for optimizing their performance.
- Current methods for in situ ion flux measurement are limited.
Purpose of the Study:
- To develop and validate a quantitative, in situ method for measuring ion transport in conducting polymer films.
- To investigate the cation flux during redox cycling of pPy(+)/pSS(-) films.
- To determine if pPy(+)/pSS(-) films exhibit preferential doping when exposed to mixed cation solutions.
Main Methods:
- Utilized rotating ring-disk electrode (RRDE) voltammetry for in situ ion transport measurement.
- Employed a supporting electrolyte sterically inhibited from film penetration.
- Focused on dopant cations meeting specific electrochemical constraints.
Main Results:
- Successfully quantified cation flux in and out of the pPy(+)/pSS(-) film.
- Demonstrated that all charge compensation changes could be accounted for by specific cations.
- Observed significant preferential doping due to kinetic factors, likely steric differences among cations.
Conclusions:
- The developed RRDE voltammetry approach provides a reliable method for in situ ion transport studies in conducting polymers.
- Preferential doping in pPy(+)/pSS(-) films is influenced by kinetic and steric factors of the dopant cations.
- This research offers insights into the electrochemical behavior and ion dynamics of composite polymer films.
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