Electrochemical modeling of the current-voltage characteristics of an SOFC in fuel cell and electrolyzer operation modes

J. C. Njodzefon, D. Klotz, A. Kromp, A. Weber, E. Ivers-Tiffée

研究成果: Contribution to journalArticle査読

50 被引用数 (Scopus)

抄録

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 impedancebased temperature measurement routine. C/V characteristics measured at 800°C in the range from 0.66 V to 1.6 V for H2O:H2 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.

本文言語英語
ページ(範囲)F313-F323
ジャーナルJournal of the Electrochemical Society
160
4
DOI
出版ステータス出版済み - 2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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