Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials

Krystina Lamb; Richard A Mole; Dehong Yu; Roland De Marco; John R Bartlett; Sarah Windsor; San Ping Jiang; Jin Zhang; Vanessa K Peterson

doi:10.1016/j.gee.2017.06.007

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Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials

Journal article

Open access

Peer reviewed

Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials

Krystina Lamb, Richard A Mole, Dehong Yu, Roland De Marco, John R Bartlett, Sarah Windsor, San Ping Jiang, Jin Zhang and Vanessa K Peterson

Green Energy & Environment, Vol.2(3), pp.294-301

2017

DOI: https://doi.org/10.1016/j.gee.2017.06.007

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Abstract

proton diffusion

Phosphotungstic acid is an excellent proton conductor that can be incorporated into porous supports, and nanocomposite proton exchange membrane materials made from mesoporous silica impregnated with phosphotungstic acid have been suggested for use in fuels cells operating > 100 °C. In this work quasielastic neutron scattering was used to study proton self-diffusion in mesoporous disordered and P6mm symmetry silica impregnated with two concentrations of phosphotungstic acid. Overall, the silica structure had a significantly greater effect on proton conduction and diffusion than phosphotungstic acid concentration, with higher proton conduction occurring for the P6mm symmetry silica samples. Quasielastic neutron scattering revealed two populations of protons diffusing through each sample, and that proton conduction is limited by the slower of these populations, which diffuse via a jump-diffusion mechanism. Whilst the fundamental jump-diffusion mechanism by which these slower protons moved was found to be similar for both silica supports and phosphotungstic acid concentrations, the faster diffusion occurring in P6mm structured silica arises from a lower residence time of protons moving between sites in the jump-diffusion model, suggesting a lower energy barrier.

Details

Title: Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials
Authors: Krystina Lamb (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Richard A Mole (Author) - Australian Nuclear Science and Technology Organisation
Dehong Yu (Author) - Australian Nuclear Science and Technology Organisation
Roland De Marco (Author) - University of the Sunshine Coast
John R Bartlett (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Sarah Windsor (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
San Ping Jiang (Author) - Curtin University
Jin Zhang (Author) - Curtin University
Vanessa K Peterson (Author) - Australian Nuclear Science and Technology Organisation
Publication details: Green Energy & Environment, Vol.2(3), pp.294-301
Publisher: Zhongguo Kexueyuan Guocheng Gongcheng Yanjiusuo
Date published: 2017
DOI: 10.1016/j.gee.2017.06.007
ISSN: 2096-2797
Copyright note: Copyright © 2017 The Authors. Open Access funded by Institute of Process Engineering, Chinese Academy of Sciences Under a Creative Commons license: https://creativecommons.org/licenses/by-nc-nd/4.0/
Grants: New mesoporous materials for use in high temperature proton exchange fuel cell membranes, DP120102325, Australian Research Council (Australia, Canberra) - ARC
Organisation Unit: School of Science and Engineering - Legacy; School of Education and Tertiary Access; University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99451264802621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Chemistry, Physical; Energy & Fuels; Engineering, Chemical; Green & Sustainable Science & Technology