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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/3876

Title: Direct View on Nanoionic Proton Mobility
Authors: Chan, WK
Haverkate, LA
Borghols, WJH
Wagemaker, M
Picken, SJ
van Eck, ERH
Kentgens, APM
Johnson, MR
Kearley, GJ
Mulder, FM
Keywords: Protons
Neutron Diffraction
Diffusion
Fuel Cells
Hydrogens
Nanostructures
Issue Date: 22-Apr-2011
Publisher: Wiley-Blackwell
Citation: Chan, W.K., Haverkate, L.A., Borghols, W.J.H., Wagemaker, M., Picken, S.J., van Eck, E.R.H., Kentgens, A.P.M., Johnson, M.R., Kearley, G.J., Mulder, F.M. (2011). Direct View on Nanoionic Proton Mobility, Advanced Functional Materials, 21(8), 1364-1374.
Abstract: The field of nanoionics is of great importance for the development of superior materials for devices that rely on the transport of charged ions, like fuel cells, batteries, and sensors. Often nanostructuring leads to enhanced ionic mobilities due to the induced space-charge effects. Here these large space-charge effects occurring in composites of the proton-donating solid acid CsHSO4 and the proton-accepting TiO2 or SiO2 are studied. CsHSO4 is chosen for this study because it can operate effectively as a fuel-cell electrolyte at elevated temperature while its low-temperature conductivity is increased upon nanostructuring. The composites have a negative enthalpy of formation for defects involving the transfer of protons from the acid to the acceptor. Very high defect densities of up to 10% of the available sites are observed by neutron diffraction. The effect on the mobility of the protons is observed directly using quasielastic neutron scattering and nuclear magnetic resonance spectroscopy. Surprisingly large fractions of up to 25% of the hydrogen ions show orders-of-magnitude enhanced mobility in the nanostructured composites of TiO2 or SiO2, both in crystalline CsHSO4 and an amorphous fraction.© 2011, Wiley-Blackwell. The definitive version is available at www3.interscience.wiley.com
URI: http://dx.doi.org/10.1002/adfm.201001933
http://apo.ansto.gov.au/dspace/handle/10238/3876
ISSN: 1616-301X
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