Proton exchange membranes with high cell performance based on Nafion/poly(p-phenylene vinylene) composite polymer electrolyte
✍ Scribed by Hyunyoo Kim; Moon-Sung Kang; Dong Hoon Lee; Jongok Won; Jungahn Kim; Yong Soo Kang
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 746 KB
- Volume
- 304
- Category
- Article
- ISSN
- 0376-7388
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✦ Synopsis
Proton exchange membranes based on Nafion/poly(p-phenylene vinylene) (PPV) composites were prepared by the heat treatment of a Nafion/PPV precursor, and investigated regarding their applicability for direct methanol fuel cells (DMFCs). The power density of MEA using Nafion/PPV composites was increased with increasing the PPV precursor concentration of the precursor solutions and reached 34 mW/cm 2 , which is much greater than that using bare Nafion (∼26 mW/cm 2 ). The improved MEA performance was primarily due to a significant decrease in the methanol permeability with only a minimal loss of the ionic conductivity through the formation of PPV grains inside of the ionic channels and on the Nafion surface. The structure and properties of the Nafion/PPV composites were characterized by UV-vis spectroscopy, scanning electron microscopy, ion exchange capacity, water contact angle, and water uptake.