SOFC-anodes, proof for a finite-length type Gerischer impedance?

被引：58

作者：

Boukamp, B. A.

Verbraeken, M.

Blank, D. H. A.

Holtappels, P.

机构：

[1] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[2] Univ Twente, MESA Inst Nano Technol, NL-7500 AE Enschede, Netherlands

[3] EMPA Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland

来源：

SOLID STATE IONICS | 2006年 / 177卷 / 26-32期

关键词：

SOFC; cermet anodes; impedance analysis; finite-length Gerischer;

D O I：

10.1016/j.ssi.2006.03.002

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 impedance of a symmetric cell with Ni/Ti-doped YSZ cermet anodes was measured as function of ambient (P-H2, P-H2O) and temperature. The impedances showed identical shapes with a minor dispersive contribution in the high frequency region and a dominating dispersion down to 0.01 Hz. The characteristic shape of this dispersion was clearly in between a finite-length Warburg (FLW) and a Gerischer impedance. Analysis of the dispersion in the Bode representation, after subtraction of the high frequency contribution, showed a clear relation with the Gerischer impedance. Assuming a finite-length constraint led to quite reasonable modelling of the data. The parameter set of this finite-length Gerischer showed a consistent dependence on P-H2, P-H2O. A qualitative interpretation of this modified Gerischer is presented. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：2539 / 2541

页数：3

共 11 条

[1] Electrode kinetics of porous mixed-conducting oxygen electrodes [J].