Durability Model of SOFC Anode Structure under Thermo-Mechanical and Fuel Gas Contaminants Effects

Abstract

Solid Oxide Fuel Cells (SOFCs) operate under harsh environments, which cause the deterioration of anode material properties and reduce their service life. In addition to electrochemical performance, structural integrity of the SOFC anode is essential for successful long-term operation. Anode-supported SOFCs rely on the anode to provide mechanical strength to the positive-electrolyte-negative (PEN) structure. The stress field in the anode may arise from a variety of phenomena including thermal expansion mismatch between layers in the PEN structure, thermal/redox cycles and external mechanical loads. Moreover, some fuel contaminants such as phosphine (PH 3) interact with the anode materials which lead to the formation of secondary phases and grain growth. These mechanisms result in the formation of microcracks, and degrade anode structural and electrochemical properties. Assessments of the evolution of anode mechanical properties during long-term operation are therefore essential to predict SOFC working life. supervision, encouragement, and support throughout my graduate studies at the West Virginia University. His mentorship was absolutely vital in the completion of this dissertation. He encouraged me to develop not only as a researcher but also as an instructor. It's a great experience to complete my doctoral studies under his guidance. Special thanks to Dr. Ismail Celik for providing me with valuable technical suggestions