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  English.dicp.cas.cn    Posted:2013-09-27
Stability and Degradation of Oxygen Electrodes for SOFCs

Time 9:00 September 28, 2013 9:00 am 

LocationNo.1 Meeting Room of the DICP Convention Center   

Lecturer Professor Xiao-Dong Zhou 

Department of Chemical Engineering, University of South Carolina, Columbia, SC, USA             

Abstract 

The essence of solid oxide fuel cells (SOFCs) lies in their high operating temperature (T> 500ºC), which enables the cermet anode (typically a mixture of yttria-stabilized zirconia (YSZ) and Ni) to be catalytically active for oxidation of a variety of fuels, from H2 to CO to hydrocarbons, without the poisoning effects (particularly from CO) observed in polymer electrolyte membrane fuel cells.  In addition, operation at elevated temperatures produces high quality heat, which makes combined heat and power systems possible.  On the other hand, the high operation temperature may result in degradation of cell performance due to instability of the constituent materials at high temperatures. This instability can manifest itself through oxidation, diffusion, phase transformation, and chemical reaction processes.  As a result, research on SOFCs has been driven by the recognition of the need to achieve high and stable (e.g., power degradation rate < 0.1% per 1000 hours) electrochemical performance.  In this lecture, I will discuss the basic issues that govern the performance stability of SOFC cathode, including densification of LSM electrode by chemical cycling, diffusion of Ni through the thin YSZ electrolyte, effects of volatile sealing components on cathode performance, Cr poisoning and thermodynamic origin of cation migration in the electrodes.  

Introduction 

Experience: 

Dr. Zhou is an Associate Professor in Chemical Engineering Department at the University of South Carolina.  Prior to that, he was a Senior Research Scientist at Pacific Northwest National Laboratory (PNNL), a US-DOE Lab in Washington, which he joined in August 2005 after two-year experience as an Assistant Research Professor at Missouri University of Science and Technology (MS&T).  At MS&T, as an associate faculty member, he led research programs and supervised graduate students. At PNNL, Dr. Zhou was leading research on oxygen electrodes for solid oxide fuel cells and thermoelectric oxides.  His academic career has been highlighted by 80 research articles that span the areas of structural, transport, and magnetic properties of condensed matters, nonstoichiometric chemistry, advanced synthesis, and device physics.  In addition, he has published 8 invited book chapters, contributed to over 100 presentations; and received 6 US patents/disclosures.   

Professional Service/Recognition: 

Dr. Zhou received J. B. Wagner Jr. Young Investigator Award in 2007 from the Electrochemistry Society (ECS) - High Temperature Materials (HTM) and the 2011 US Department of Defense – DARPA Young Faculty Award.  He is Vice Chair and an Executive Committee member of HTM Division of ECS; and organized several symposia for the ECS. He has served on several program review panels and reviewed proposals for National Science Foundation, Petroleum Research Foundation, Basic Energy Science-DOE, US DoD, and SECA-DOE.  Dr. Zhou is an Associate Editor for the Journal of the American Ceramic Society.  Dr. Zhou was selected by the National Academy of Engineering to participate in the Indo-American Frontiers of Engineering held in Agra, India (2010).  He was an invited presenter for a number of scientific conferences and research institutes.   

Contact DNL0302 Baofeng Tu 9028 

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