Non-monotonic conductivity relaxation of proton-conducting BaCe0.85Y0.15O3-δ upon hydration and dehydration

被引：37

作者：

Lim, D. -K. ^{[1
]}

Choi, M. -B. ^{[1
]}

Lee, K. -T. ^{[2
]}

Yoon, H. -S. ^{[2
]}

Wachsman, E. D. ^{[2
]}

Song, S. -J. ^{[1
,2
]}

机构：

[1] Chonnam Natl Univ, Sch Mat Sci & Engn, Kwangju 500757, South Korea

[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2011年 / 36卷 / 15期

关键词：

BaCe0.85Y0.15O3-delta; Partial conductivity; Twofold relaxation; CHEMICAL DIFFUSIVITIES; HYDROGEN PERMEATION; CHARGE-CARRIERS; CERAMICS; MOBILITY; OXIDE;

D O I：

10.1016/j.ijhydene.2011.04.203

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrical and relaxation properties of Y-doped barium cerate (BaCe0.85Y0.15O3-delta; BCY) were studied as a function of both P-O2 and P-H2O in the temperature range of 600-900 degrees C. The partial conductivities of protons, holes, and oxygen vacancies were successfully calculated, and the activation energy determined for proton transport was 0.29 eV. Twofold non-monotonic conductivity relaxation behaviors were clearly confirmed in the temperature range of 700 similar to 800 degrees C during hydration/dehydration. The hydrogen chemical diffusivity at a fixed oxygen partial pressure (P-O2), (D) over tilde (iH), was greater than that of (D) over tilde (vH), i.e., the oxygen chemical diffusivity at a fixed P-O2, at all experimental conditions, suggesting that the hydrogen chemical diffusion is always faster than oxygen upon hydration/dehydration in the temperature range studied. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：9367 / 9373

页数：7

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