Effects of Thickness and Aluminum Titanate Doping on the Mechanical Properties of Solid Oxide Fuel Cell Anodes

Zachary White, Stephen Walsh, and Dr. Roberta Amendola, Department of Mechanical and Industrial Engineering, Montana State University, Culbertson Hall, 100, Bozeman, MT 59717

As societal power demands and environmental concerns increase, sustainable and clean sources of energy are becoming increasingly important. Solid oxide fuel cells (SOFCs) have the potential to meet this demand since they generate power electrochemically by oxidizing a fuel and in turn producing heat, water vapor, and electrical power. Because power generation is small across a single SOFC, SOFCs are stacked to increase power output. To achieve contact, SOFC units must be clamped, undergoing high levels of stress. Due to the inherent brittleness of the SOFCs ceramic material, failure can be unexpected, instantaneous, and catastrophic to the system. Improved materials are needed that could increase SOFCs stack strength and lead to a longer lifespan of SOFC. In the last decade anode supported SOFCs have been considered because of the enhanced electrochemical performance when compared to electrode supported cells. Recent studies have shown that doping NI-YSZ anodes with Aluminum Titanate (ALT) improves the electrochemical performance as well as its mechanical strength, however there has been little research into optimization of ALT doping level and anode thickness in order to optimize the cell performance. The aim of this study was to investigate the effect of ALT doping level on anode mechanical properties in conjunction with differing anode thicknesses. Samples were made with thicknesses varying from 1000 µm to 200 µm and ALT 0%-10% ALT doping levels. Tape casting was selected as the manufacturing method while mechanical properties were evaluated using a ring on ring strength testing. Advanced Weibull statistical analyses was used to evaluate results.  Results showed that the benefit of ALT doping are carried over any considered thickness, therefore thin anodes could be manufactured with enhanced strength and predicted improved electrochemical performance.

Additional Abstract Information

Presenter: Zachary White

Institution: Montana State University

Type: Poster

Subject: Mechanical & Industrial Engineering

Status: Approved

Time and Location

Session: Poster 8
Date/Time: Tue 5:00pm-6:00pm
Session Number: 5597