A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC)
Aggregation in heat-treated Nafion ionomer dispersion and 117 membrane are investigated by 1H and 19F Nuclear Magnetic Resonance (NMR) spectra, spin-lattice relaxation time, and self-diffusion coefficient measurements. Results demonstrate that heat-treatment affects the average Nafion particle size...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2012-12-01
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| Series: | Membranes |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2077-0375/2/4/841 |
| _version_ | 1797722844952526848 |
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| author | Sophia Suarez Yara Adam Sufia Khatun Daniel Akins Zhiqing Zou Haifeng Zhang Ting Yuan |
| author_facet | Sophia Suarez Yara Adam Sufia Khatun Daniel Akins Zhiqing Zou Haifeng Zhang Ting Yuan |
| author_sort | Sophia Suarez |
| collection | DOAJ |
| description | Aggregation in heat-treated Nafion ionomer dispersion and 117 membrane are investigated by 1H and 19F Nuclear Magnetic Resonance (NMR) spectra, spin-lattice relaxation time, and self-diffusion coefficient measurements. Results demonstrate that heat-treatment affects the average Nafion particle size in aqueous dispersions. Measurements on heat-treated Nafion 117 membrane show changes in the 1H isotropic chemical shift and no significant changes in ionic conductivity. Scanning electron microscopy (SEM) analysis of prepared cathode catalyst layer containing the heat-treated dispersions reveals that the surface of the electrode with the catalyst ink that has been pretreated at ca. 80 °C exhibits a compact and uniform morphology. The decrease of Nafion ionomer’s size results in better contact between catalyst particles and electrolyte, higher electrochemically active surface area, as well as significant improvement in the DMFC’s performance, as verified by electrochemical analysis and single cell evaluation. |
| first_indexed | 2024-03-12T09:53:29Z |
| format | Article |
| id | doaj.art-884cd830f3a24d7fab4fba0a4372492a |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T09:53:29Z |
| publishDate | 2012-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-884cd830f3a24d7fab4fba0a4372492a2023-09-02T12:22:08ZengMDPI AGMembranes2077-03752012-12-012484185410.3390/membranes2040841A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC)Sophia SuarezYara AdamSufia KhatunDaniel AkinsZhiqing ZouHaifeng ZhangTing YuanAggregation in heat-treated Nafion ionomer dispersion and 117 membrane are investigated by 1H and 19F Nuclear Magnetic Resonance (NMR) spectra, spin-lattice relaxation time, and self-diffusion coefficient measurements. Results demonstrate that heat-treatment affects the average Nafion particle size in aqueous dispersions. Measurements on heat-treated Nafion 117 membrane show changes in the 1H isotropic chemical shift and no significant changes in ionic conductivity. Scanning electron microscopy (SEM) analysis of prepared cathode catalyst layer containing the heat-treated dispersions reveals that the surface of the electrode with the catalyst ink that has been pretreated at ca. 80 °C exhibits a compact and uniform morphology. The decrease of Nafion ionomer’s size results in better contact between catalyst particles and electrolyte, higher electrochemically active surface area, as well as significant improvement in the DMFC’s performance, as verified by electrochemical analysis and single cell evaluation.http://www.mdpi.com/2077-0375/2/4/841Nafion ionomeraggregationmembrane electrode assemblycatalyst utilizationdirect methanol fuel cellNMRviscosity |
| spellingShingle | Sophia Suarez Yara Adam Sufia Khatun Daniel Akins Zhiqing Zou Haifeng Zhang Ting Yuan A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC) Membranes Nafion ionomer aggregation membrane electrode assembly catalyst utilization direct methanol fuel cell NMR viscosity |
| title | A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC) |
| title_full | A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC) |
| title_fullStr | A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC) |
| title_full_unstemmed | A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC) |
| title_short | A Study of the Effect of Heat-Treatment on the Morphology of Nafion Ionomer Dispersion for Use in the Passive Direct Methanol Fuel Cell (DMFC) |
| title_sort | study of the effect of heat treatment on the morphology of nafion ionomer dispersion for use in the passive direct methanol fuel cell dmfc |
| topic | Nafion ionomer aggregation membrane electrode assembly catalyst utilization direct methanol fuel cell NMR viscosity |
| url | http://www.mdpi.com/2077-0375/2/4/841 |
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