Electrochemical Modeling of the Current-Voltage Characteristics of an SOFC in Fuel Cell and Electrolyzer Operation Modes

被引：92

作者：

Njodzefon, J-C ^{[1
]}

Klotz, D. ^{[1
]}

Kromp, A. ^{[1
]}

Weber, A. ^{[1
]}

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

机构：

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

[2] KIT, CFN, D-76131 Karlsruhe, Germany

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2013年 / 160卷 / 04期

关键词：

SOLID OXIDE ELECTROLYSIS; INTERMEDIATE TEMPERATURE; HYDROGEN-PRODUCTION; STEAM ELECTROLYSIS; PERFORMANCE; ACTIVATION; IMPEDANCE; MICROSTRUCTURE; POLARIZATION; DEGRADATION;

D O I：

10.1149/2.018304jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A zero-dimensional and isothermal stationary model demonstrably predicting the current-voltage (C/V) characteristic of an anode supported SOFC single cell is for the first time verified for C/V characteristics measured in electrolysis mode. The accuracy of the presented model was increased by including the actual cell temperature under current load, determined by an impedance-based temperature measurement routine. C/V characteristics measured at 800 degrees C in the range from 0.66 V to 1.6 V for H2O:H-2 compositions 70:30 and 30:70 reveal a pronounced asymmetric operation of the fuel electrode supported cell in electrolysis mode. This experimentally observed behavior is accurately reproduced by the model and is explained by (i) increasing polarization losses related to Knudsen diffusion and (ii) decreasing reaction rate in dry conditions at the fuel electrode at high current densities in electrolysis mode. (C) 2013 The Electrochemical Society. [DOI: 10.1149/2.018304jes] All rights reserved.

引用

页码：F313 / F323

页数：11

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