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Materials Day 2006 - Posters

Fuel Cells and Other Energy Technologies

• E04 - Solid-State Thermo Electric (TE) Devices
  A. Venimadhav, A. Soukiassian, Q. Li, X. X. Xi, D. G. Schlom
  Abstract: Solid-state thermo electric (TE) devices require materials that can efficiently convert thermal to electrical power and vise versa. Presently, narrow band gap semiconductors such as Bi2Te3, PbTe and SiGe as being used in the TE devices. Recently, inorder to uncover the origin of high temperature superconductivity, a number of new oxides that exhibit excellent specific physical properties were discovered. NaXCoO2 is one such example that shows record high thermo power of all know oxides. This environmental friendly material can potentially play a competitive role to replace environmental hazardous Bi2Te3 in thermo electric applications. Fabrication of NaXCoO2 in thin film form for specific device application is challenging due to volatility of Na. We show a method to prepare epitaxial NaXCoO2 films by combining Pulsed laser deposition and solid state synthesis route. In the poster we will also present a method to control the Na concentration that can tune the thermo power efficiency.
  
  
• E05 - Nanostructured Inorganic-Organic Proton Conductive Membranes for High Temperature PEM Fuel Cells
  E. Chalkova, M. V. Fedkin, T. C. M. Chung, S. Komarneni, A. Chaudhari, J. O. Sofo, S. N. Lvov
  Abstract: This poster demonstrates a synergistic experimental-theoretical study on novel inorganic-polymer nanocomposite membranes, which are highly promising solid electrolytes for high temperature (120-250 °C) proton exchange membrane (PEM) fuel cells. Our approach is to use a variety of solid inorganic proton conductors and hydrophilic materials combined with thermally and chemically stable polymers to minimize the dependence of the membrane conductivity on the availability of liquid water and to achieve higher phase stability at elevated temperatures. Newly synthesized composite materials are thoroughly tested using advanced analytical instruments and experimental techniques, and these data provide the actual support for the molecular dynamic modeling of membrane processes. Thus, this research will contribute to the fundamental materials science and lead to an array of novel nanostructured inorganic-organic proton conductive membranes for high temperature PEM fuel cells.
  
  URL: http://www.egee.psu.edu/Faculty/lvov.htm