Importance of pressure gradient in solid oxide fuel cell electrodes for modeling study

Meng Ni, Dennis Y.C. Leung, Michael K.H. Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)

Abstract

The pressure gradients in the electrodes of a solid oxide fuel cell (SOFC) are frequently neglected without any justification in calculating the concentration overpotentials of the SOFC electrodes in modeling studies. In this short communication, a comparative study has been conducted to study the effect of pressure gradients on mass transfer and the resulting concentration overpotentials of an SOFC running on methane (CR4) fuel. It is found that the pressure gradients in both anode and cathode are significant in the fuel cell electrochemical activities. Neglecting the anode pressure gradient in the calculation can lead to underestimation of the concentration overpotential by about 20% at a typical current density of 5000 A m-2and at a temperature of 1073 K. The deviation can be even larger at a higher temperature. At the cathode, neglecting the pressure gradient can result in overestimation of the concentration overpotential by about 10% under typical working conditions.
Original languageEnglish
Pages (from-to)668-673
Number of pages6
JournalJournal of Power Sources
Volume183
Issue number2
DOIs
Publication statusPublished - 1 Sep 2008
Externally publishedYes

Keywords

  • Electrochemical model
  • Mass transfer
  • Methane steam reforming (MSR)
  • Porous media
  • SOFC
  • Water gas shift (WGS)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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