Title

Effects Of Electrode Microstructure On Intermediate Temperature Solid Oxide Fuel Cell Performance

Keywords

Electrode microstructure; Intermediate temperature solid oxide fuel cell; SOFC modeling

Abstract

In this study, the effects of electrode microstructure and electrolyte parameters on intermediate temperature solid oxide fuel cell (ITSOFC) performance were investigated using a one-dimensional solid oxide fuel cell model from the Pacific Northwest National Laboratory (PNNL). The activation overpotential was investigated through the exchange current density term, which is dependent on the cathode activation energy, the cathode porosity, and the pore size and grain size at the cathode triple phase boundary. The cathode pore size, grain size, and porosity were not integrated in the PNNL model, therefore, an analytical solution for exchange current density from Deng and Petric (2005, "Geometric Modeling of the Triple-Phase Boundary in Solid Oxide Fuel Cells," J. Power Sources, 140, pp. 297-303) was utilized to optimize their effects on performance. Through parametric evaluation and optimization of the electrode microstructure parameters, the activation overpotential was decreased by 29% and the overall ITSOFC maximum power density was increased by almost 400% from the benchmark PNNL case. The effects and importance of electrode microstructure parameters on ITSOFC performance were defined. Optimization of such parameters will be the key in creating viable ITSOFC systems. Although this was deemed successful for this project, future research should be focused on numerically quantifying and modeling the electrode microstructure in twoand three-dimensions for more accurate results, as the electrode microstructure may be highly multidimensional in nature. Copyright © 2010 by ASME.

Publication Date

10-1-2010

Publication Title

Journal of Fuel Cell Science and Technology

Volume

7

Issue

5

Number of Pages

510151-5101515

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/1.4000683

Socpus ID

77956376039 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77956376039

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