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Increased Cathodic Kinetics in IT-SOFCs by Inserting Highly-Conductive Nanocrystalline Materials

[+] Author Affiliations
Hong Huang

Stanford University, Stanford, CA; Wright State University, Dayton, OH

Tim Holme, Fritz B. Prinz

Stanford University, Stanford, CA

Paper No. FuelCell2008-65123, pp. 55-60; 6 pages
doi:10.1115/FuelCell2008-65123
From:
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • Denver, Colorado, USA, June 16–18, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4318-1 | eISBN: 0-7918-3822-6
  • Copyright © 2008 by ASME

abstract

One of the crucial factors for improving intermediate-temperature SOFC performance relies on reduction of the activation loss originating from limited electrode reaction kinetics. We investigated the properties and functions of nanocrystalline interlayer via quantum simulation (QS) and electrochemical impedance analyses. Electrode impedances were found to decrease several-fold as a result of introducing a nanocrystalline interlayer and this positive impact was the most significant when the interlayer was a highly ionic-conductive nanocrystalline material. Both exchange current density and maximum power density were highest in the ultra-thin SOFCs (fabricated with MEMS compatible technologies) consisting of a 50nm thick nano-GDC interlayer. Oxygen vacancy formation energies both at the surface and in the bulk of pure zirconia, ceria, yttria-stabilized zirconia (YSZ), and gadolinia doped ceria (GDC) were computed from density functional theory, which provided insight on surface oxygen vacancy densities.

Copyright © 2008 by ASME

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