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Fast Proton Conduction Facilitated by Minimum Water in a Series of Divinylsilyl-11-Silicotungstic Acid-co-Butyl Acrylate-co-Hexanediol Diacrylate Polymers

Published

Author(s)

Lauren F. Greenlee, Andrew M. Herring, James L. Horan, Anitha Lingutla, Hui Ren, Mei-Chen Kuo, Sonny Sachdeva, Yuan Yang, Soenke Seifert, Michael A. Yandrasits, Steven J. Hamrock, Matthew H. Frey

Abstract

Studies of proton transport in novel materials are important to enable a large array of electrochemical devices. In this study, we show that heteropoly acids (HPAs) when immobilized in polymer matrices have highly mobile protons. Divinyl-11-silicotungstic acid, an HPA, was co- polymerized with butyl acrylate and hexanediol diacrylate at various weight percentage loadings from 25 to 85% using μv initiated polymerizations. The resultant films were tan colored flexible sheets of ca. 120 μm thickness. The morphology of these films varied with loading showing phase separation into clustered HPA above a 50 wt.% loading and lamella morphologies above an 80 wt.% loading. Water uptake was strongly associated with the HPA clusters, which facilitated transport of protons. This was realized by proton conductivities as high as 0.4 S cm-1 at 95oC and 95%RH and 0.1 S cm-1 at 85oC and 50%RH. Pulse field gradient spin echo NMR measurements indicated that water self diffusion was fast (1.4 x 10-5 and 4.4 x 10-4 cm2 s-1 for 50 and 100%RH respectively) at 80oC. We show that the water in these systems is highly associated with the HPA clusters and that fast proton transport is facilitated by as few as 3 water molecules per proton.
Citation
Journal of Physical Chemistry C
Volume
118
Issue
1

Citation

Greenlee, L. , Herring, A. , Horan, J. , Lingutla, A. , Ren, H. , Kuo, M. , Sachdeva, S. , Yang, Y. , Seifert, S. , Yandrasits, M. , Hamrock, S. and Frey, M. (2014), Fast Proton Conduction Facilitated by Minimum Water in a Series of Divinylsilyl-11-Silicotungstic Acid-co-Butyl Acrylate-co-Hexanediol Diacrylate Polymers, Journal of Physical Chemistry C, [online], https://doi.org/10.1021/jp4089657 (Accessed June 16, 2024)

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Created January 9, 2014, Updated November 10, 2018