TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst in the first oxidation state is ferromagnetic and electroconductive and the catalyst in the second oxidation state is antiferromagnetic and electro-insulating. The strontium cobaltite is stabilized on a substrate comprising perovskite (A1B1O3), strontium titanium oxide (SrTiO3), and lanthanum aluminum oxide-strontium aluminum tantalum oxide ((LaAlO3)0.3-(Sr2AlTaO6)0.7), where A1 is an alkaline metal and an alkaline earth element, and B1 is a transitional metal. Preferred Method: The transition from the first oxidation state to the second oxidation state occurs in less than 1 minute, and within a temperature range of 210-320 degrees C. The transition from a first oxidation state to a second oxidation state is rapidly reversible at low temperatures. The transition from the first oxidation state to the second oxidation state is: a reduction process, where the first oxidation state is strontium cobaltite in a perovskite phase and the second oxidation state is strontium cobaltite in a brown millerite phase, and the reduction process is completed in less than 1 minute and at 210-320 degrees C; or a reversible process, where the reversible process is an oxidation process and the brownmillerite phase of the strontium cobaltite is oxidized to the perovskite phase of the strontium cobaltite, the oxidation process is completed in less than 1 minute and at 201-320 degrees C, and the perovskite phase of strontium cobaltite comprises strontium cobalt oxide (SrCoO(3-d). The method further comprises: reversing the transitioning of the catalyst from a first oxidation state to the second oxidation state by transitioning the catalyst from the second oxidation state to the first oxidation state by elevating the temperature of catalyst in the second oxidation state, and providing oxygen for a second period of time, where the second period of time is sufficient to effect the transition of the catalyst to the first oxidation state. EXAMPLE - No suitable example given.