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Published on: January 30, 2015
XPS Study of Counterion Incorporation into Poly(vinylferrocene)
X Zeng1, S Moon, S Bruckenstein
1Department of Chemistry, University at Buffalo, SUNY, Buffalo, New York 14214.
X-ray Photoelectron Spectroscopy (XPS) quantifies charge participation in electroactive polymers. Poly(vinylferrocene) films show complete oxidation with various counterions, and perchlorate ions partition at 67% the rate of fluoroborate ions.
Area of Science:
- Electrochemistry
- Polymer Science
- Surface Science
Background:
- Electroactive polymers are crucial for energy storage and sensing.
- Understanding charge compensation mechanisms is key to optimizing polymer performance.
- X-ray Photoelectron Spectroscopy (XPS) offers insights into polymer surface electrochemistry.
Purpose of the Study:
- To determine the fraction of charge centers participating in redox processes in electroactive polymers.
- To quantify the relative partition coefficients of competing counterions in polymer films.
- To investigate the electrochemical behavior of poly(vinylferrocene) films using XPS.
Main Methods:
- Poly(vinylferrocene) films were immersed in supporting electrolytes under potential control.
- X-ray Photoelectron Spectroscopy (XPS) was employed to analyze film composition and oxidation states.
- Concentration ratios of competing ions in aqueous and polymer phases were used as variables.
Main Results:
- All ferrocene units on the surface of poly(vinylferrocene) films could be oxidized with common counterions (perchlorate, tetrafluoroborate, hexafluorophosphate, tosylate, 1,5-naphthalenedisulfonate).
- The partition coefficient of perchlorate ions was determined to be 67% relative to fluoroborate ions in oxidized poly(vinylferrocene) films.
- No internal standard was required for quantifying ion partitioning.
Conclusions:
- XPS is effective for studying charge compensation in electroactive polymers.
- The choice of counterion significantly influences the redox behavior and ion partitioning in poly(vinylferrocene) films.
- This study provides quantitative data on ion selectivity in polymer electrolytes.
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