Event Scheduled for Aug 10, 2017
Event: MSE Seminar Speaker - Dr. Jasna Jankovic
Time: 09:45 am
Details of Event:
Guest Speaker: Dr. Jasna Jankovic
Topic: “Advanced characterization and prototyping of the materials for fuel cell applications”
Date: Thursday, August 10th
Abstract: Proton Exchange Membrane Fuel Cells (PEMFC) are being considered as one of the most promising solutions for zero emission transportation. Properties, performance and durability of a PEMFC very much depend on microstructure and spatial distribution of components in the gas diffusion layer, micro-porous layer and especially in the electrode catalyst layers of the fuel cell. Conventional FC electrodes are typically 2-15 micron thin layers that contain a complex composite of Pt catalyst for enhancing the reaction, carbon black as catalyst support and electron transport medium, ionomer covering Pt/C agglomerates as binder and proton-conducting medium, and pores for gas and water transport. Understanding of how microstructure of these layers and spatial distribution of all components affect properties and performance of a fuel cell is crucial for their further development.
Understanding of these effects is challenging due to limited understanding of actual 2D and 3D structure of the components, especially over a wide range of length scales. Recent development in advanced imaging techniques and computation power enables new approaches and discoveries. This seminar will give an overview of a number of advanced microscopy and spectroscopy techniques utilized during my work at AFCC to reveal microstructure and catalyst layer structural parameters and their correlations to FC properties and performance. 3D Electron Tomography reconstruction of a catalyst agglomerate on a nano-scale, revealing the spatial distribution of all components, including Ionomer, will be shown for the first time. To build upon that, the talk will give an example of a multi-scale imaging approach based on Electron Tomography, Focused Ion Beam-Scanning Electron Microscopy and 3D X-Ray Microscopy, and direct transport property simulation for a catalyst layer. In addition, novel approaches in quantifying fuel cell catalyst layer parameters from Transmission ElectronMicroscopy – Energy Dispersive X-ray Spectroscopy will be reviewed, along with the obtained structure-property-performance correlations. All of these techniques are relevant to other materials and applications. Finally, some material prototyping approaches for novel catalyst layer designs based on electrospun carbon nanofibers will be given. The seminar will be followed by a presentation on prospective future research projects.
Bio: Dr. Jasna Jankovic has completed her undergraduate degree in Chemical and Biological Engineering at the University of Belgrade, Serbia. After working for 5 years at a petroleum refinery in Serbia, she moved to Canada with her family in 2002. She completed Master’s program in heavy oil upgrading and PhD program with the focus on development of intermediate temperature fuel cell materials, both at the University of British Columbia (UBC). Her PhD was a close collaboration between National Research Centre for Fuel Cell Innovation and UBC. From that moment Dr. Jankovic’s focus was on development of materials for clean energy applications.
In 2011 Dr. Jankovic started working for the Automotive Fuel Cell Cooperation (AFCC), a joint venture between Daimler, Germany and Ford, US automotive companies. AFCC’s mission is development of Proton Exchange Fuel Cells for automotive application. Dr. Jankovic’s role as a senior research scientist has been in development and application of advanced microscopy and spectroscopy techniques for fuel cell materials characterization, and correlation of materials microstructure to their properties and performance in a fuel cell. Dr. Jankovic has been leading and participating in a number of collaborative projects with universities, national research laboratories and industrial partners. Dr. Jankovic has been involved in teaching, mentoring and research supervision of undergraduate and graduate students throughout her career. She is currently serving as a PhD thesis committee member in the Materials Engineering Department of the University of British Columbia, as well as on the Natural Sciences and Engineering Research Council of Canada (NSERC) Scholarships and Fellowships Selection Committee for Chemical, Biomedical and Materials Science Engineering. At this point, she is looking to expand her research further and devote her time to teaching young generations in a university environment.
Sponsored By: Materials Science and Engineering Program
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