Preparation of noble metal oxide nano-composite films by MOCVD and their electrode properties

Abstract

YSZ-MO₂ (M=lr,Ru)nano-composite films were prepared by MOCVD. The films were dense and consisted of spherical grains in diameter of several tens nano-meters. The electrical conductivity of zirconia/electrode interface was increased with increasing Ir or Ru content in the nano-composite films and became the maximum at 15-25vol%MO₂. This trend could be explained by a percolation of MO₂ particles in the composite films. The emf values of the oxygen concentration cell constructed from the composite film electrode and YSZ electrolyte showed the Nernstian theoretical values at 650°C.