Insight into proton trapping in hydrated Y-doped BaZrO3
perovskite by solid-state NMR spectroscopy
Frédéric Blanc
Department of Chemistry, University of Liverpool, UK
frederic.blanc@liverpool.ac.uk
The application of solid state Nuclear Magnetic Resonance (NMR) approaches to correlate
structure and motion in protonic conductors materials will be described. A particular focus is
the development of methodology to examine the local proton and the dynamics of mobile
protons.1
Hydrated Y-doped BaZrO3 present high proton conductivities and excellent chemical stability
and are therefore being investigated as electrolytes for solid-oxide fuel cells, particular in the
intermediate-temperature region (300 – 500 °C).2–4 However, fundamental questions regarding
the defect chemistry and macroscopic proton transport mechanism, especially in regard of
proton trapping, remain. Using a combined thermogravimetric, ac impedance and high
temperature 1H solid state NMR study, we will show that macrosocopic proton transport in this
material is limited by proton-dopant association (proton trapping).4 We will then demonstrate
that how double resonance 1H 89Y solid state NMR experiments could be used to detect these
proton trap sites.5
(1) Blanc F. et al. Acc. Chem. Res. 2013, 46, 1952–1963. (2) Kreuer, K. D. Annu. Rev. Mater. Res. 2003, 33, 333–
359. (3) Yamazaki, Y. et al. Chem. Mater. 2009, 21, 2755–2762. (4) Yamazaki, Y. et al. Nat. Mat. 2013, 12, 647–
651. (5) Blanc, F. et al. J. Phys. Chem. Lett. 2014, 5, 2431–2436.