Fabrication of Direct Oxidation Solid Oxide Fuel Cell Anodes Using a Novel Atmospheric Plasma Spraying Technique

摘要

Composite coatings of CuO and samaria-doped ceria (SDC) have been fabricated by atmospheric plasma spraying using a combination of suspension and dry-powder plasma spray techniques. The coatings prepared using this novel hybrid technique demonstrate a finer microstructure than similar coatings prepared using conventional dry-powder methods. The coatings consist of fully-melted and partially-melted phases of both CuO and SDC. During deposition, a large portion of the CuO was reduced to Cu_2O. The influence of processing conditions on deposition efficiency and porosity were investigated, with a plasma power of 77 kW leading to a maximum in coating porosity. Improvement of the dispersion of the CuO suspension by adjusting the pH led to a finer network of CuO particles in the fabricated coating.