Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1290422 | Journal of Power Sources | 2008 | 6 Pages |
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 (CH4) 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 5000Â AÂ mâ2 and at a temperature of 1073Â 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.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Meng Ni, Dennis Y.C. Leung, Michael K.H. Leung,