Title: Electrosubstitution at the Metal, Metal Compounds/Na–β″-Al2O3Interface in the SOED Method
Abstract: The electrochemical reaction and electrosubstitution of a metal from the pure metal, its oxide, or its carbonate at the Na–β″-Al2O3interface, 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–β″-Al2O3at 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.