Journal article
Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials
Green Energy & Environment, Vol.2(3), pp.294-301
2017
Abstract
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 EngineeringRichard A Mole (Author) - Australian Nuclear Science and Technology OrganisationDehong Yu (Author) - Australian Nuclear Science and Technology OrganisationRoland De Marco (Author) - University of the Sunshine CoastJohn R Bartlett (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringSarah Windsor (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringSan Ping Jiang (Author) - Curtin UniversityJin Zhang (Author) - Curtin UniversityVanessa 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; 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/
- 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
- Research Statement
- false
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- Collaboration types
- Domestic collaboration
- Web Of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Engineering, Chemical
- Green & Sustainable Science & Technology