Examinando por Autor "Ruiz-Morales, Juan Carlos"

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Engineering of materials for solid oxide fuel cells and other energy and environmental applications
(2010) Ruiz-Morales, Juan Carlos; Marrero-López, David; Gálvez-Sánchez, María; Canales-Vázquez, Jesús; Savaniu, Cristian; Savvin, Stanislav N.
The search for cleaner environmentally friendly power sources has been one of the hot topics in research over the past few years. Solid oxide fuel cells can be considered a promising option for the production of clean energy and one of the simplest routes to improve the efficiency of these devices is the microstructural engineering of component materials. In this work, an insight is provided into several cost-effective procedures of microstructural control of SOFC materials, ranging from an “eye-scale” down to the micrometre scale. The proposed procedures may be considered general and as such they can be used to optimise various materials for energy and environmentally related areas.
Engineering of materials for solid oxidefuelcells and other energy and environmental applications
(2010) Ruiz-Morales, Juan Carlos; Marrero-López, David; Gálvez-Sánchez, María; Canales-Vázquez, Jesús; Savaniu, Cristian; Savvin, Stanislav N.
The search for cleaner environmentally friendly power sources has been one of the hot topics in research over the past few years. Solid oxide fuel cells can be considered a promising option for the production of clean energy and one of the simplest routes to improve the efficiency of these devices is the microstructural engineering of component materials. In this work, an insight is provided into several cost-effective procedures of microstructural control of SOFC materials, ranging from an “eye-scale” down to the micrometre scale. The proposed procedures may be considered general and as such they can be used to optimise various materials for energy and environmentally related areas.
Influence of the precursor pyrolysis temperature on the microstructure and conductivity of Gd-doped ceria materials
(Elsevier, 2013-09) Sánchez-Bravo, Gloria B.; García, Olga; Gálvez-Sánchez, María; Violero, José Manuel; Rosa, Alberto; Carpena, Isaac; Ruiz-Morales, Juan Carlos; Canales-Vázquez, Jesús
Gd-doped ceria nanopowders have been synthesized via a modified sol–gel technique using different pyrolysis temperatures to produce a range of particle sizes. Such nanocrystalline oxides have been sintered at 1400 °C for 24 h to produce fully dense disks. The microstructural characterization reveals that the pyrolysis temperature notably affects the grain size distribution in the sintered ceramics, e.g. powders treated at 700 °C render the narrowest grain size distribution. The electrochemical characterisation performed by electrochemical impedance spectroscopy shows that the distribution of grain sizes in the dense electrolytes rules the electrical conductivity of CGOs rather than the average grain size. Narrower grain size distributions render electrolytes exhibiting higher overall conductivity, independent of the average grain size.