Special MSE Seminar: Hee Sung Yoon
Friday, May 4, 2012
UMERC Conference Room, 1202 Engineering Lab Bldg.
Process Integration for Scale-up of Low Temperature Solid Oxide Fuel Cells at UMERC
Hee Sung Yoon
Associate Research Scientist
University of Maryland Energy Research Center
Fuel cells convert the chemical energy of a fuel into electrical energy by the electrochemical reaction with oxygen. Among these, solid oxide fuel cells (SOFCs) can operate directly on hydrocarbon fuels (such as natural gas, biomass, propane, and gasoline) as well as pure hydrogen. However, the SOFC operating temperature, from 600 to 1000°C, is significantly higher than that of other fuel cell systems. High temperature operation, over 700°C, limits commercial deployment due to high cost of fabrication and operation coupled with the degradation of SOFC stack performance at these temperatures. Our ongoing research focuses on reducing the operating temperature to overcome those problems.
Recently, we developed a high-power SOFC that operates at significantly lower temperature, 400 to 650°C, by controlling the microstructure of the interface between the electrolyte and electrode using a simple infiltration technique to increase the number of catalytic sites for the half-cell reactions. In addition, an integrated process for large-scale cell fabrication has been developed using tape casting and the infiltration technique as a low cost fabrication method. These advances have tremendous potential for mobile and stationary power generation.