More sustainable electricity generation in hot and dry fuel cells with a novel hybrid membrane of Nafion/nano-silica/hydroxyl ionic liquid

Li, Yan and Shi, Yan and Mehio, Nada and Tan, Mingsheng and Wang, Zhiyong and Hu, Xiaohong and Chen, George Z. and Dai, Sheng and Jin, Xianbo (2016) More sustainable electricity generation in hot and dry fuel cells with a novel hybrid membrane of Nafion/nano-silica/hydroxyl ionic liquid. Applied Energy, 175 . pp. 451-458. ISSN 0306-2619

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Abstract

A new hybrid proton exchange membrane (PEM) has been prepared from hydroxyl functionalized imidazolium ionic liquid (IL-OH), Nafion and nano-SiO2. The IL-OH, with a hydroxyl group that acts as both a proton acceptor and donor, forms strong hydrogen bonds with both Nafion and nano-SiO2, resulting in an effective hydrogen bond network in the ternary membrane. Such an anhydrous hydrogen-bond network, which is unknown previously, endows the PEMs with higher proton conductivity, greater thermal stability and surprisingly a more robust mechanical performance than PEMs consisting of conventional ionic liquids. The resulting PEMs have a tensile strength that is more than twice as strong as recast Nafion and an anhydrous ionic conductivity of ∼55 mS cm−1 at temperatures above 160 °C, with a proton transfer number of ∼0.9. A laboratory assembled H2–O2 fuel cell employing this new PEM delivered a power density of 340 and 420 mW cm−2 at 160 and 180 °C, respectively.

Item Type: Article
Keywords: Proton exchange membranes; Hydroxyl ionic liquids; Hydrogen-bonds; Nafion; Intermediate-temperature fuel cells
Schools/Departments: University of Nottingham, Ningbo Campus > Faculty of Science and Engineering > Division of Engineering
University of Nottingham UK Campus > Faculty of Engineering > Department of Chemical and Environmental Engineering
Identification Number: https://doi.org/10.1016/j.apenergy.2016.03.075
Depositing User: Eprints, Support
Date Deposited: 06 Jun 2016 13:16
Last Modified: 18 Sep 2016 10:37
URI: http://eprints.nottingham.ac.uk/id/eprint/33649

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