报告时间：2012年12月18日（星期二）上午9:00

报告地点：能源楼会议中心二号会议室

报告人： Dr. Xiao-Dong Zhou

　　　  Department of Chemical Engineering, University of South Carolina

报告摘要：

The essence of solid oxide fuel cells (SOFCs) lies in their high operating temperature (T> 500oC), which enables their cermet anode (typically a mixture of yttria-stabilized zirconia (YSZ) and Ni) to be catalytically active for oxidation of a variety of fuels. The SOFC cathode, the reduction electrode which dissociates oxygen molecules to oxygen ions, is generally considered to be the cell component that limits the electrochemical performance of anode-supported planar SOFCs. In this lecture, I will discuss several key issues related to cathode in particular and fuel cell measurements in general. The topics include (1) cross-validation of the polarization of a single cell measured using both ac impedance spectroscopy and dc I-V sweep, (2) the precise determination of the total area specific resistance, and its role in understanding cathodic polarization of LSCF cathodes, (3) approaches to achieve high performance and highly stable LSCF cathode, and (4) degradation mechanism for LSM/YSZ- and LSCF-based cells. The emphasis will placed on experimental and theoretical approaches to investigate a conjugated phenomenon for the cathode: the dichotomy between performance and performance stability. I will illustrate these approaches by using the concept of disorder in materials (e.g. lattice defects) to study charge exchange and transport in the components and across the interfaces in an SOFC. Moreover, the role of defects on enhanced transport properties of oxide conductors at nanoscale will be discussed, which offers opportunities for technological innovations.

报告人简介：

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.

报告联系人：DNL0302组 赵哲（9146）