Proton diffusivity in the BaZr0.9Y0.1O3-δ proton conductor

被引：36

作者：

Braun, Artur ^{[1
]}

Duval, Sophie ^{[1
]}

Ried, Peter ^{[1
]}

Embs, Jan ^{[2
,3
,4
]}

Juranyi, Fanni ^{[2
,3
]}

Straessle, Thierry ^{[2
,3
]}

Stimming, Ulrich ^{[5
]}

Hempelmann, Rolf ^{[4
]}

Holtappels, Peter ^{[1
]}

Graule, Thomas ^{[1
]}

机构：

[1] Empa Swiss Fed Labs Mat Testing & Res, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland

[2] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[4] Univ Saarland, D-66041 Saarbrucken, Germany

[5] Tech Univ Munich, Dept Phys E19, D-85748 Garching, Germany

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2009年 / 39卷 / 04期

关键词：

Proton diffusivity; Quasi-elastic neutron scattering; Impedance spectroscopy; Grotthuss mechanism; Chudley-Elliott model; ELASTIC NEUTRON-SCATTERING; ELECTRICAL-CONDUCTIVITY; SRCE0.95YB0.05H0.02O2.985; HYDROGEN;

D O I：

10.1007/s10800-008-9667-3

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The thermally activated proton diffusion in BaZr0.9Y0.1O3-delta was studied with electrochemical impedance spectroscopy (IS) and quasi-elastic neutron scattering (QENS) in the temperature range 300-900 K. The diffusivities for the bulk material and the grain boundaries as obtained by IS obey an Arrhenius law with activation energies of 0.46 eV and 1.21 eV, respectively. The activation energies obtained by IS for the bulk are 0.26 eV above 700 K and 0.46 eV, below 700 K. The total diffusivity as obtained by IS is by one order of magnitude lower than the microscopic diffusivity as obtained by QENS. The activation energies obtained by QENS are 0.13 eV above 700 K and 0.04 eV, below 700 K. At about 700 K, the diffusion constants for IS and QENS have a remarkable crossover, suggesting two processes with different activation energies.

引用

页码：471 / 475

页数：5

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