Polymer electrolyte membrane (PEM) fuel cell has been regarded as a potential power source for portable and mobile applications due to its noteworthy features of high efficiency and zero emission. In operation, hydrogen and air are fed into anode and cathode gas channels, respectively, and react with water as the only byproduct. Water product may flood electrodes and fuel cell, reducing voltage output. In this talk, I will present three major areas of work that UCI has original contributions in recent years, including:
1.Spatial variation of the reaction rate in cathodes. Though the cathode catalyst layer is thin less than 10 micro meter, reaction may differ significantly from site to site. UCI introduced a new parameter to quantify the spatial variation of reaction, and proposed a novel multilayer configuration for the cathode catalyst layer.
2.Microchannel two-phase flows. We will introduce our recent work on two-phase flow in thin gas flow channels (0.3 mm thick) and general porous media flow fields. It is found that the flow in thin microchannels is subject to the stratified regime for hydrophilic channels, but falls in the rivulet regime when one side wall changes to hydrophobic. Two-phase flow stability at the channel-manifold interface was studied. Theories regarding flow in porous media flow field will also be covered.
3.Microscale two-phase flow through GDL. In recent, we successfully implemented the VOF study of two-phase flow through GDLs by capturing local porosity and PTFE loading variations. New theory regarding the heterogeneous GDLs will be presented and discussed.
Some recent progress in catalyst development and Toyota Mirai in the literature will be presented as background introduction.
WANG Yun received his B.S. and M.S. degrees in Mechanics and Engineering Science from Peking University in 1998 and 2001, respectively. He went to the Pennsylvania State University where he received his Ph.D degree in Mechanical Engineering in 2006. Wang joined the MAE (Mechanical and Aerospace Engineering) faculty at the University of California, Irvine in 2006. Wang has published over 70 publications in PEM fuel cell, including a book on PEM Fuel Cell Water and Thermal Management Principles in 2013 and a PEM fuel cell review paper in 2011 (which has been cited over 1,640 googlescholar times). He received a few awards, including the prestigious Distinguished President's Award from Orange County Engineering Council, to recognize his scholarly contribution to engineering, and the Seasky Scholarship from Dalian University of Technology. Wang served as Track chair/co-chair, session chair/co-chair, conference chair and committee member for a few international conferences of fuel cells, thermal energy, and mechanical engineering. WANG is currently Associate Professor at the UC Irvine.