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• W2024190919 endingPage "5280" @default.
• W2024190919 startingPage "5272" @default.
• W2024190919 abstract "Abstract We have developed novel cross-linked sulfonated polyimide (c-SPI) membrane as an electrolyte for direct methanol fuel cells (DMFCs). When the DMFC using the c-SPI membrane (thickness = 155 μm), Pt–Ru dispersed on carbon black (Pt–Ru/CB) anode and Pt/CB cathode with a Nafion ® ionomer was operated at 80 °C and 0.1 A cm −2 with 1 M CH 3 OH and oxygen (oxidant), the methanol crossover rate, j (CH 3 OH), was suppressed to about 1/2 compared with that of the Nafion ® 117 membrane (thickness = 180 μm) with the same electrodes. It was found for both cells that the j (CH 3 OH) was not so small as expected from the membrane thickness. In order to obtain a clue for the suppression of j (CH 3 OH), the distribution profiles of water (containing CH 3 OH) in thickness direction were investigated by measuring the specific resistances ( ρ ) between Pt probes inserted into the electrolyte membrane. Values of ρ at the anode side were low irrespective of the discharge current density, because such a part of the membrane was humidified thoroughly by liquid water (1 M CH 3 OH) allowing free penetration of CH 3 OH into the swollen polymer. In contrast, the values of ρ at the cathode side were high at the low current density due to drying of the membrane contacting with oxidant gas (O 2 or air) in low humidity. We have succeeded to suppress the j (CH 3 OH) further (about 1/2 at 0.2 A cm −2 ) by using bilayer c-SPI, having a low ion exchanging (low swelling) barrier layer at the anode side without increasing the ohmic resistance, compared with that of the single c-SPI." @default.
• W2024190919 created "2016-06-24" @default.
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• W2024190919 date "2007-04-01" @default.
• W2024190919 modified "2023-10-14" @default.
• W2024190919 title "Distribution profile of water and suppression of methanol crossover in sulfonated polyimide electrolyte membrane for direct methanol fuel cells" @default.
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• W2024190919 doi "https://doi.org/10.1016/j.electacta.2007.02.056" @default.
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