New Ru-SrMo0.9O3-d perovskite with exsolved Ru nanoparticles as high-performance composite anodes for solid-oxide fuel cells
A new perovskite with metallic Ru in exsolution Ru-SrMo0.9O3-¿, has been prepared and tested as anode material in intermediate-temperature solid-oxide fuel cells (IT-SOFCs) generating a power of 600 mW/cm2 at 850 °C using pure H2 as fuel. It was obtained by reduction of a Ru-containing scheelite oxide, from which Ru is segregated to the surface as metal nanoparticles. The electrical conductivity gave a maximum value of 390 S cm-1 at 850 °C. A suitable thermal expansion coefficient, with values close to that of the electrolyte, showed no abrupt changes in its slope. All these features make this novel perovskite a perfect candidate as anode material in IT-SOFCs. In this experiment we aim at correlating the good performance of this material as anode with the structural features determined from NPD, as neutrons are very sensitive to the presence of oxygen vacancies, which are required for the MIEC properties of these materials. For this purpose we plan to study the crystallographic structures at RT for Ru-SrMo0.9O3-¿. We aim at gaining information about the actual crystal symmetry, the order-disorder of the oxygen vacancies and the thermal vibrations and oxygen contents.
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CASCOS JIMENEZ Vanessa Amelia and FERNANDEZ DIAZ Maria Teresa. (2023). New Ru-SrMo0.9O3-d perovskite with exsolved Ru nanoparticles as high-performance composite anodes for solid-oxide fuel cells. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-1130
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