Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes
Nafion<sup>®</sup> is a cation exchange polymer that is commonly used in aqueous energy applications such as fuel cells due to its ability to exclude anions and neutral molecules and increase apparent diffusion of cationic redox molecules. However, this behavior is not well studied in no...
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2024-12-01
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| author | Anna F. Claire Peter Zacher Danielle Lehto Daysha Krahn Krysti L. Knoche Gupta |
| author_facet | Anna F. Claire Peter Zacher Danielle Lehto Daysha Krahn Krysti L. Knoche Gupta |
| author_sort | Anna F. Claire |
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| description | Nafion<sup>®</sup> is a cation exchange polymer that is commonly used in aqueous energy applications such as fuel cells due to its ability to exclude anions and neutral molecules and increase apparent diffusion of cationic redox molecules. However, this behavior is not well studied in nonaqueous solutions. The behavior of platinum electrodes modified with recast Nafion<sup>®</sup> films in nonaqueous solutions was observed to be different from its well-studied behavior in aqueous solutions. The reversible redox couple tris(2,2′-bipyridine)ruthenium(II) hexafluorophosphate was studied in the nonaqueous, aprotic solvent acetonitrile with different electrolytes (tetrabutylammonium tetrafluoroborate, tetrabutylammonium trifluoromethanesulfonate, tetrabutylammonium hexafluorophosphate, and ammonium trifluoromethanesulfonate) using cyclic voltammetry and rotating disk voltammetry. An unmodified platinum electrode in the nonaqueous systems and a recast Nafion<sup>®</sup>-modified platinum electrode equilibrated in an aqueous solution of tris(bipyridine)ruthenium(II)chloride hexahydrate were used as controls. Results indicate that the polymer structure in acetonitrile conditions does not allow apparent (Dahms–Ruff) diffusion but does allow significant physical diffusion that would make Nafion a great immobilization option for modifying electrodes with catalysts in nonaqueous systems. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-fd7064e6e74b4a3e8b031b8786336b5c2024-12-27T14:22:55ZengMDPI AGElectrochem2673-32932024-12-015457458410.3390/electrochem5040037Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various ElectrolytesAnna F. Claire0Peter Zacher1Danielle Lehto2Daysha Krahn3Krysti L. Knoche Gupta4Department of Chemistry & Biochemistry, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USADepartment of Chemistry & Biochemistry, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USADepartment of Chemistry & Biochemistry, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USADepartment of Chemistry & Biochemistry, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USADepartment of Chemistry & Biochemistry, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USANafion<sup>®</sup> is a cation exchange polymer that is commonly used in aqueous energy applications such as fuel cells due to its ability to exclude anions and neutral molecules and increase apparent diffusion of cationic redox molecules. However, this behavior is not well studied in nonaqueous solutions. The behavior of platinum electrodes modified with recast Nafion<sup>®</sup> films in nonaqueous solutions was observed to be different from its well-studied behavior in aqueous solutions. The reversible redox couple tris(2,2′-bipyridine)ruthenium(II) hexafluorophosphate was studied in the nonaqueous, aprotic solvent acetonitrile with different electrolytes (tetrabutylammonium tetrafluoroborate, tetrabutylammonium trifluoromethanesulfonate, tetrabutylammonium hexafluorophosphate, and ammonium trifluoromethanesulfonate) using cyclic voltammetry and rotating disk voltammetry. An unmodified platinum electrode in the nonaqueous systems and a recast Nafion<sup>®</sup>-modified platinum electrode equilibrated in an aqueous solution of tris(bipyridine)ruthenium(II)chloride hexahydrate were used as controls. Results indicate that the polymer structure in acetonitrile conditions does not allow apparent (Dahms–Ruff) diffusion but does allow significant physical diffusion that would make Nafion a great immobilization option for modifying electrodes with catalysts in nonaqueous systems.https://www.mdpi.com/2673-3293/5/4/37polymer-modified electrodenonaqueous electrochemistryacetonitrile voltammetryrecast Nafion film |
| spellingShingle | Anna F. Claire Peter Zacher Danielle Lehto Daysha Krahn Krysti L. Knoche Gupta Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes Electrochem polymer-modified electrode nonaqueous electrochemistry acetonitrile voltammetry recast Nafion film |
| title | Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes |
| title_full | Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes |
| title_fullStr | Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes |
| title_full_unstemmed | Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes |
| title_short | Electrochemical Characterization of Recast Nafion<sup>®</sup> Film-Modified Electrodes in Acetonitrile with Various Electrolytes |
| title_sort | electrochemical characterization of recast nafion sup r sup film modified electrodes in acetonitrile with various electrolytes |
| topic | polymer-modified electrode nonaqueous electrochemistry acetonitrile voltammetry recast Nafion film |
| url | https://www.mdpi.com/2673-3293/5/4/37 |
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