Role of the doping level in localized proton motions in acceptor-doped barium zirconate proton conductors

Physical Chemistry Chemical Physics : PCCP
Daria NoferiniMaths Karlsson

Abstract

Acceptor-doped barium zirconates are currently receiving considerable interest because of their high proton conductivity at intermediate temperatures, making them applicable as electrolytes in various electrochemical devices, but the mechanism of proton conduction is unclear. Here, we investigate the role of the acceptor-dopant level in the localized proton motions, i.e. proton transfers between oxygens and O-H reorientations, in hydrated samples of the proton conducting, acceptor-doped, perovskites BaZr1-xInxO3-x/2 with x = 0.10 and 0.20, using quasielastic neutron scattering (QENS). Analysis of the QENS spectra reveals that several proton transfer and O-H reorientational motions contribute to the QENS signal, as a consequence of the locally disordered nature of the structure due to the In doping of these materials, and establishes a generic and complex picture of localized proton dynamics in acceptor-doped barium zirconate based proton conductors. A comparison of the QENS results with vibrational spectroscopy data of the same materials, as reported in the literature, suggests a predominance of O-H reorientational motions in the observed dynamics. The highest doping level corresponds to a more distorted structure and faster dy...Continue Reading

References

Sep 8, 2010·Chemical Society Reviews·Emiliana FabbriEnrico Traversa
Aug 5, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Paolo RaiteriGiovanni Bussi
Oct 18, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Maths Karlsson
May 15, 2013·Nature Materials·Yoshihiro YamazakiSossina M Haile

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Citations

Sep 22, 2019·Membranes·Dmitry TsvetkovAndrey Zuev

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Methods Mentioned

BETA
neutron diffraction
X-ray
neutron scattering

Software Mentioned

TOPAS
QENS
TOFTOF
LAMP

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