ELECTROSUBSTITUTION AT THE METAL, METAL COMPOUNDS/Na-beta double prime-Al2O3 INTERFACE IN THE SOED METHOD

摘要

The electrochemical reaction and electrosubstitution of a metal from the pure metal, its oxide, or its carbonate at the Na-beta''-Al2O3 interface, which are very important as a cationic source in the solid oxide electrochemical doping (SOED) method, have been studied. Ag+ was easily electrosubstituted for Na+ in Na-beta''-Al2O3 at a low applied voltage, but not the metal ions from metal oxides because of their strong binding energy. Some cations from their carbonates were substituted for Na+ at a relatively low applied voltage. Consequently, some metal salts as well as pure metals can be useful as the electrode for a cationic source in the SOED method. The mechanism of the electrosubstitution is discussed. 6 refs.