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Pyrochlore Zirconium Gadolinium Oxide Nanorods Composite Membrane for Suppressing the Formation of Free Radical in PEM Fuel Cell Operating Under Dry Condition
- Pyrochlore Zirconium Gadolinium Oxide Nanorods Composite Membrane for Suppressing the Formation of Free Radical in PEM Fuel Cell Operating Under Dry Condition
- Han, Da Bin; Hossain, Syed Imdadul; Son, Byungrak; Lee, Dong-Ha; Shanmugam, Sangaraju
- DGIST Authors
- Son, Byungrak; Lee, Dong-Ha; Shanmugam, Sangaraju
- Issue Date
- ACS Sustainable Chemistry and Engineering, 7(19), 16889-16899
- Article Type
- Author Keywords
- Proton exchange membrane fuel cells; Nafion composite membrane; Pyrochlore compound; Durability; Fluoride ion emission
- PROTON-EXCHANGE MEMBRANE; OXYGEN REDUCTION REACTION; NAFION MEMBRANES; LOW HUMIDITY; TRANSPORT; DEGRADATION; NANOPARTICLES; CONDUCTIVITY; HYDROGEN; CEOX/C
- A proton exchange membrane fuel cell uses perfluorosulfonic acid polymers as a proton exchange membrane but exhibits poor performance and durability under dry operating condition. Herein, we develop a composite membrane by incorporating porous inorganic filler, Zr2Gd2O7, into a perfluorosulfonic acid, Nafion. Zr2Gd2O7 nanorods (ZrGdNR) are synthesized using an electrospinning process and subsequently calcination under air atmosphere at 500 °C. The Nafion-ZrGdNR composite (Nafion-ZrGdNR) and NRE-212 membranes exhibit power densities of 858 and 695 mW cm-2, respectively, at 0.6 V under 100% relative humidity at 80 °C. At 20% relative humidity, the maximum power density of the Nafion-ZrGdNR membrane (448 mW cm-2) is 3.8 times higher than that of a commercial NRE-212 membrane (119 mW cm-2), and moreover, the Nafion-ZrGdNR membrane exhibits a fluoride emission rate of 6.9 × 10-5 ppm h-1 cm-2, which is about 240 times lower that of than the NRE-212 membrane (1670 × 10-5 ppm h-1cm-2) for 120 h of open-circuit voltage testing. The composite membrane shows high proton conductivity, superior oxidative stability, and improved mechanical strength. The outstanding performance and remarkable durability of the Nafion-ZrGdNR membrane are due to its efficient water diffusion and stability against hydroxyl radical attack, resulting in low ohmic resistance and improved membrane degradation. Copyright © 2019 American Chemical Society.
- American Chemical Society
- Related Researcher
Advanced Energy Materials Laboratory
Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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