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Characterization and Modeling of Infiltrated Solid Oxide Fuel Cell Cathodeby Dr Xingbo LIU
Date: 31 Oct 2014 (Fri)Time: 11:00a.m. to 12:00noon
Venue: Room Z414, PolyU
With Attendance Certificate
FCE Public
Lecture
AbstractInfiltration has been extensively applied to SOFC cathodes, with the principal assumption that infiltrants having high oxygen absorption capabilities enhance oxygen flux into the cathode backbone and thus improve the cathode performance. However, few systematic investigations exist on oxygen reduction and reaction (ORR) mechanisms in infiltrated SOFC cathodes. In this presentation, we report our studies on several issues related to infiltrated cathode:
(1) Characterizing Surface Exchange Behavior - Oxygen surface exchange coefficient (k) and diffusivity (D) values have been widely reported in the literatures, by either electrical conductivity relaxation (ECR) or isotope exchange (IE) methods. We have developed an improved data collection and processing method for enhancing the accuracy of the ECR technique. Evaluation of the global minimum in the fitted error is made by analyzing multiple samples of varying thickness, which improves parameter evaluation compared to analysis of a single relaxation data set; (2)Oxygen Interfacial Exchange Behavior - By modifying a conventional ECR setup, a technique and related data processing method are developed to characterize the oxygen transport behavior between infiltrants and the cathode backbone. We utilized this technique to characterize the LSC/LSCF and SDC/LSCF systems; (3) ORR Modeling of infiltrated Cathode - we have developed a micro-scale model of LSM-YSZ composite cathodes, which incorporates the effects of cathode microstructural properties on the local transport phenomena and electrochemistry inside the cathode. The reaction mechanism used in the model has two parallel routes for oxygen conversion into oxide ions, namely two-phase boundary and three-phase boundary pathways. The model predicts field distributions of local thermodynamic values, over-potential, Faradaic current and other parameters relevant to cathode performance.
About the Speaker
Dr Xingbo Liu graduated from University of Science and Technology Beijing in 1999, and he subsequently went to West Virginia University as a postdoc. Currently, he is the professor and associate chair for research in Mechanical & Aerospace Engineering Department at WVU. Dr Liu’s main research interests are advanced high temperature materials for next generation energy conversion and storage. Dr Liu has received numerous awards including Innovator of the Year Award (Techconnect WV, 2013), R&D 100 Award (2011), TMS Early Career Faculty Fellow Award (2010), WVU CEMR Researcher of the Year Award (2011), Outstanding Researcher Awards (2011, 2009, 2008), and others.
Professor & Associate Chair of ResearchMechanical & Aerospace Engineering Department
West Virginia University, USA
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