Perovskites manganese-based

Manganese-based perovskites are widely recognized as the materials best suited for the cathode of a high-temperature SOFC that uses a zirconia-based electrolyte and operates at temperatures higher than 800°C. In this section, (La, Sr)Mn03 (LSM) is chosen for further discussion. 

The only ordered perovskite which has been studied for catalytic activity is Ba2C0W06. This has been found to be comparable to the manganese based, rare earth perovskite, but it is easily poisoned in the presence of SO2 (Voorhoeve et al., 1974). 

The relatively high cost and lack of domestic supply of noble metals has spurred considerable efforts toward the development of nonnoble metal catalysts for automobile exhaust control. A very large number of base metal oxides and mixtures of oxides have been considered, especially the transition metals, such as copper, chromium, nickel, manganese, cobalt vanadium, and iron. Particularly prominent are the copper chromites, which are mixtures of the oxides of copper and chromium, with various promoters added. These materials are active in the oxidation of CO and hydrocarbons, as well as in the reduction of NO in the presence of CO (55-59). Rare earth oxides, such as lanthanum cobaltate and lanthanum lead manganite with Perovskite structure, have been investigated for CO oxidation, but have not been tested and shown to be sufficiently active under realistic and demanding conditions (60-63). Hopcalities are out-... 

Several optical investigations of charge ordering transitions in Ca-based manganese perovskites have been performed. Okimoto et al. performed... 

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