Abstract
High-resolution neutron backscattering spectroscopy reveals the atomic-scale motions of protons in hydrated barium zirconates.
Highlights
Acceptor-doped proton conducting perovskites, such as Indoped BaZrO3 (BZO), are currently receiving considerable attention because of their promising application as electrolytes in next-generation fuel cells and hydrogen separation membranes.[1]
To highlight the effect of a basic jump diffusion process on the IFWS response we report in Fig. 5 an IFWS signal computed with a normalized standard Lorentzian function L(Q, ħu) characterizing the quasielastic neutron scattering (QENS) signal whose width G is determined by the Chudley–Elliot model (CEM)[22] of jump diffusion de ned as
We studied the dynamics of protons in hydrated samples of the proton conducting perovskite BaZr1ÀxMxO with M 1⁄4 Sc and Y for x 1⁄4 0.1, and M 1⁄4 In for x 1⁄4 0.1, 0.2 and 0.25
Summary
Acceptor-doped proton conducting perovskites, such as Indoped BaZrO3 (BZO), are currently receiving considerable attention because of their promising application as electrolytes in next-generation fuel cells and hydrogen separation membranes.[1] A critical, long-standing, challenge pertains to understanding and controlling the level of proton conductivity by modi cation of the (local) structure of the perovskite lattice, as in uenced by, e.g., the type and concentration of acceptor dopants.[2,3]. The current understanding of the proton transport mechanism in proton conducting oxides is based primarily on results obtained from computer simulations, and from quasielastic neutron scattering (QENS) on bulk powder samples of acceptordoped BaZrO3 and BaCeO3, as summarized recently.[4] We showed in a series of preceding QENS experiments based on the 7538 | J.
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