Title

Effects of electrode microstructure and electrolyte parameters on intermediate temperature solid oxide fuel cell (ITSOFC) performance

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 SOFC model from the Pacific Northwest National Laboratory (PNNL). After a brief review of the fundamental SOFC operating processes and a literature review incorporating more advanced SOFC topics, such as electrode microstructure modeling and mixed ionic and electronic (MIEC) composite cathodes, it was determined from the PNNL benchmark results that the dominating ITSOFC losses were caused from the activation and Ohmic overpotentials. 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 (TPB). 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) was utilized to optimize their effects on performance. The Ohmic loss was determined to be entirely dependent on the electrolyte ionic conductivity, and an optimal value for this conductivity was determined.

Simultaneous optimization of the above parametric evaluations led to a 388 % increase in performance from the PNNL benchmark case at 600 °C. Although this was deemed successful for this project, future research should be focused on numerically quantifying and modeling the electrode microstructure in two and·three-dimensions for more accurate results, as the electrode microstructure may be highly multi-dimensional in nature.

Notes

This item is only available in print in the UCF Libraries. If this is your thesis or dissertation, you can help us make it available online for use by researchers around the world by downloading and filling out the Internet Distribution Consent Agreement. You may also contact the project coordinator Kerri Bottorff for more information.

Thesis Completion

2009

Degree

Bachelor of Science (B.S.)

College

College of Engineering and Computer Science

Degree Program

Mechanical Engineering

Subjects

Dissertations, Academic -- Engineering and Computer Science;Engineering and Computer Science -- Dissertations, Academic

Format

Print

Identifier

DP0022380

Language

English

Access Status

Open Access

Length of Campus-only Access

None

Document Type

Honors in the Major Thesis

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