Electrochemical Analysis of Sulfur-Poisoning in Anode Supported SOFCs Fuelled with a Model Reformate

被引：53

作者：

Kromp, A. ^{[1
]}

Dierickx, S. ^{[1
]}

Leonide, A. ^{[1
]}

Weber, A. ^{[1
]}

Ivers-Tiffee, E. ^{[1
,2
]}

机构：

[1] KIT, IWE, D-76131 Karlsruhe, Germany

[2] KIT, DFG Ctr Funct Nanostruct CFN, D-76131 Karlsruhe, Germany

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 05期

关键词：

CELLS; DECONVOLUTION; TEMPERATURE; ELECTRODES; TIME; H2S;

D O I：

10.1149/2.015206jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The impact of sulfur-poisoning on the electrochemistry of anode-supported solid oxide fuel cells (SOFCs) has been analyzed via electrochemical impedance spectroscopy. Therefore, single cells manufactured by Forschungszentrum Julich (FZJ) were operated with a reformate fuel. During operation, contents of H2S (0.1 and 0.5 ppm) were added to the fuel. A detailed analysis of the measured impedance spectra by the distribution of relaxation times (DRT) and a subsequent complex nonlinear least squares (CNLS) fit enabled a separated treatment of the resulting degradation of anodic and cathodic polarization processes. During the exposure to 0.5 ppm H2S, the polarization resistance increased by 200%, leveling off after 24 h. This strong increase has mainly been attributed to the decreased reaction rate of the electrochemical fuel oxidation. Additionally, a strongly decreased conversion rate of the water-gas shift reaction was determined from the impedance measurements. This decreased shift conversion rate results in a dramatically lowered utilization of the CO within the fuel. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.015206jes] All rights reserved.

引用

页码：B597 / B601

页数：5

共 26 条

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