ChemInform Abstract: Preparation and Characterization of Platinum-Ceramic Composite Powders and Thin Films.
Abstract
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ChemInform Abstract
Title composite powders containing TiO2, ZrO2 or Y2O3-partially- stabilized (5 mol%) ZrO2 (PSZ) are prepared by the sol-gel-like liquid- phase reaction method starting from H2PtCl6, Ti(O-iPr)4 or Zr(O-iPr)4 and Y(NO3)3 in the case of Pt-PSZ. A sintered film of Pt-PSZ composite is a good conductor (1.5 × 10-5 ω×cm) exhibiting excellent low cathodic overpotential for oxygen reduction which is less than 20 mV even at high current density of 0.1 A/cm2 at 750 . degree.C. Both Pt-TiO2 and Pt-PSZ powders have good catalytic activity in NO reduction. The Pt composite powders are useful as electrode materials in high-temp. solid oxide fuel cells and gas sensors.
