COLL 127 |
| Jen-Hau Wan, Department of Chemistry ( /Department of MS&E), University of Texas, Austin, UT Austin, ME/MS&E, ETC 9.126, 1 University Station C2201, Austin, TX 78712 and John B. Goodenough, Texas Materials Institute, University of Texas at Austin, ETC 9.102, Austin, TX 78712. |
| According to our previous study, the mixed oxide ion/electronic conductor SrCo0.8Fe0.2O3-d (SCF) has the highest oxide-ion conductivity of all perovskite oxide in an oxidizing atmosphere. Results also show application of a thin layer of SCF on the surface of La0.5Sr0.5CoO3-d not only increases the overall oxygen flux, but also changes a mixed bulk and surface-reaction control to a bulk diffusion control of the oxide-ion conductivity. We have investigated the additional enhancement of the surface reaction kinetics by sputtering Ag, Pd and Pt catalysts on the surface of SCF for the dissociative chemisorption of O2. Also Pt catalytic function for H2 and CH4 chemisorption on Cu and Ni anodes is discussed; a Cu anode is preferred over a Ni anode for hydrocarbon fuels. The electrode overpotentials are monitored to test the efficiency of the catalysts. The work was done on the doped LaGaO3 electrolyte SOFC system. However, this catalytic function is not restricted to this electrolyte; it also applies to both doped zirconia and doped ceria. |
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Electrochemistry and Surface Science Symposium in Memory of Mike Weaver
Division of Colloid and Surface Chemistry |