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Here, we report the valence of transition metals at surface, magnetic ordering and oxide-ion transport pathway of the double perovskite-type Ba2Ca0.67M0.33NbO6−δ (MMn, Fe, Co). In-situ X-ray photoelectron spectroscopy (XPS) reveals that the surface valences for Mn and Co-doped Ba2Ca0.67M0.33NbO6−δ are 2.5+ and 2+, respectively at 700°C. All the Ba2Ca0.67M0.33NbO6−δ samples are paramagnetic with no...
A solid oxide fuel cell (SOFC) is an energy conversion device, which directly converts chemical fuels (e.g., H2, CO, and CxHy) into electricity and heat with high efficiency up to about 90 %. The main by-product CO2 when hydrocarbons used as fuels can be sequestrated or subsequently chemically transformed into chemical fuels (e.g., CO) by electrolysis using renewable energy sources, such as solar...
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