Date of Award

8-1-2016

Degree Name

Master of Science

Department

Mechanical Engineering

First Advisor

Koc, Rasit

Abstract

Solid Oxide Fuel Cells have attracted much attention over the past few decades due to their huge potential for clean power generation in stationary, portable and transport applications and our increasing need for sustainable energy resources. The purpose of this research is to develop an interconnect and cathode material for use in solid oxide fuel cells which demonstrates desired properties of high electrical conductivity, excellent chemical stability at high temperatures, desirable thermal expansion characteristics and which can be easily manufactured by sintering in conditions acceptable with other cell components. The present work was initiated to study the synthesis and properties of five different perovskite oxides comprising of Lanthanum in combination with different mol% of Chromium, Ferrum, Cobalt and Nickel. A polymer complexing route with slight modifications was used to prepare the precursor powders. The powder x-ray diffraction patterns at room temperature show that all samples were formed in single phase. The powders in the form of pellets were sintered at 1400°C. The temperature dependent resistivity data was measured and the conductivity data was calculated. This conductivity data have been fitted with the Arrhenius model for entire studied range of temperature (25-800°C) to calculate the activation energy. La based perovskite oxides were characterized using X-ray diffraction (XRD), and scanning electron microscopy (SEM). Electrical properties and microstructural studies show potential applications of the materials as interconnect and cathode for Solid Oxide Fuel Cell. The material which has the above desired properties was proposed and component modifications for tailoring such properties were shown for SOFCs and other similar applications.

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