Name: Wilson K.S. Chiu
Affiliation: Institute of Materials Science
Department: Mechanical Engineering
Personal/Lab Website: http://www.engr.uconn.edu/me/cms/people/39-wilsonchiu
Program/Department Website: http://www.engr.uconn.edu/me/cms/
Office Telephone: (860) 486-3284
Materials used in energy storage and conversion (e.g. fuel cells, batteries, electrolyzers, CO2 separation membranes) all consist of heterogeneous functional materials that exhibit functional behavior in a manner that controls their collective performance as an energy system. There is a critical need to understand the role of a material’s structure, morphology, and composition on system performance. This seminar presents a non-destructive approach to image and characterize energy materials using synchrotron-based transmission x-ray microscopy. Three-dimensional structures within the sample volume are imaged and tomographically reconstructed at up to 17 nm spatial resolution. Several theoretical approaches including numerical methods (lattice Boltzmann, finite element) and analytical methods (electrochemical fin theory) are used to analyze mass transfer, heat transfer, ionic/electronic charge transfer, and chemical / electrochemical reaction rates. To demonstrate this approach, solid oxide fuel cell and in Li-ion battery electrodes are examined to provide fundamental insight into the origins of microstructured-induced transport losses during operation.