Oxide ion and proton dynamics in Ba7Nb4MoO20 solid electrolyte
Dual oxide ion and proton conductors have been proposed as promising materials for application in solid oxide fuel cells (SOFCs). Fluorite-type yttria-stabilized zirconia (YSZ) is currently the most commonly used electrolyte in SOFCs, leading to high operating temperatures (800 - 1000 °C), precluding their more widespread use. Recently, the high oxide ion and proton conductivity of 4.0 mS cm-1 at 510 °C in humidified air has been reported in Ba7Nb4MoO20, a cation deficient hexagonal perovskite derivative. The conductivity of this novel ionic conductor is considerably higher than that of YSZ. With the conductivity measurements confirming long-range dynamics in Ba7Nb4MoO20, we propose to perform variable-temperature inelastic and quasi-elastic neutron scattering experiments on this dual oxide ion and proton conductor in dry and humidified air. This should enable us to separate and individually characterise the dynamics directly related to oxide ion and proton conduction. We request 4 days of IN16B beam time and 4 days of IN5 beam time to carry out variable-temperature inelastic/quasi-elastic neutron scattering experiments on Ba7Nb4MoO20.
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SCHWAIGHOFER Bettina; APPEL Markus; EVANS Ivana; GONZALEZ Miguel Angel and KOZA Michael Marek. (2021). Oxide ion and proton dynamics in Ba7Nb4MoO20 solid electrolyte. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-03-196
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