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Listar por autor "Marrero-López, David"
Mostrando ítems 1-20 de 22
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Ajuste de las propiedades estructurales de molibdatos de lantano a través de la modificación de los entramados catiónicos y aniónicos
Porras-Vázquez, José Manuel; Bergillos-Ruíz, Marta; López-Vergara, Adrián; Marrero-López, David; Losilla, Enrique R. (2018-06-28)Los materiales basados en molibdatos de lantano, con fórmula general La6-xMoO12-, son candidatos a membranas de separación de hidrógeno debido su conductividad electrónica y protónica. Estos cristalizan en diferentes ... -
Ce0.8Gd0.2O2‐δ / La0.6Sr0.4CoO3 Heterostructures prepared by pulsed laser deposition
Dos Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Ramirez-Losilla, Enrique; Marrero-López, David (2018-09-14)Oxide interfaces have received greater attention due to the possibility to obtain properties that are very different from bulk materials. Due to the wide variety of electronic and ionic phenomena than can be detected at ... -
Compatibility and performance of SOFCs based on lanthanum tungstates
Dos Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Zayas-Rey, María José; Ramirez-Losilla, Enrique; Marrero-López, David (2015-07-10)Rare-earth tungstates with general composition “Ln6WO12” have attracted great attention in last few years due to their relatively high mixed proton-electron conductivity [1, 2]. One of the main ad-vantages of these ... -
Desarrollo y control microestructural en materiales para pilas de combustible de óxidos sólidos
Dos Santos Gomez, Lucia (UMA Editorial, 2018-10-17)Las pilas de combustible de óxidos sólidos (SOFCs) son una de las alternativas más prometedoras para producir energía eléctrica de manera eficiente y respetuosa con el medio ambiente. Durante la fabricación de una SOFC es ... -
Durability and performance of CGO barriers and LSCF cathode deposited by spray-pyrolysis
Dos Santos-Gómez, Lucía; Hurtado, Javier; Porras-Vázquez, José Manuel; Losilla, E.R.; Marrero-López, David (Elsevier, 2018-03-19)Ce0.9Gd0.1O1.95 (CGO) protective layers are prepared by two different methods to prevent the reaction between the Zr0.84Y0.16O1.92 (YSZ) electrolyte and the La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. In the first method, ... -
Effect of preparation conditions on the polymorphism and transport properties of lanthanum molybdates
Porras-Vázquez, José Manuel; López-Vergara, Adrián; Infantes-Molina, A.; Canales-Vázquez, J.; Cabeza-Diaz, Aurelio; [et al.] (2017-10-24)In this work, La6MoO12-based compounds were investigated as part of a new family of materials very competitive as hydrogen separation membranes [1,2]. La5.4MoO11.1 was synthesized by the freeze-drying precursor method and ... -
Effect of the modification of the cationic and anionic framework on the structural and electrical properties of lanthanum molybdates
López-Vergara, Adrián; Bergillos-Ruíz, Marta; Porras-Vázquez, José Manuel; Marrero-López, David; Losilla, Enrique R. (2019-07-19)Fluorinated lanthanum molybdates have been prepared at 1500 and 1200 ºC for 1 h and cooled down at 5 ºC min-1. The combination of anionic (F-) and cationic (Nb5+) doping stabilizes the cubic polymorph without needing a ... -
Effect of Zn addition on the structure and electrochemical properties of codoped BaCe0.6Zr0.2Ln0.2O3-δ (Ln=Y, Gd, Yb) proton conductors
Zamudio-García, J; Porras-Vázquez, José Manuel; Dos Santos-Gómez, Lucía; Losilla, E.R.; Marrero-López, David (Elsevier, 2018-05-02)In this work, BaCe0.6Zr0.2Y0.2-xYbxO3-δ and BaCe0.6Zr0.2Gd0.2-xYbxO3-δ (x=0–0.20), proton conducting materials are prepared by the freeze-drying precursor method. The sintering conditions were optimized by adding ... -
High efficiency cathodes for SOFCs prepared by spray-pyrolysis
Dos Santos-Gómez, Lucía; Ramirez-Losilla, Enrique; Marrero-López, David (2015-07-10)In recent years, lowering the operating temper-ature of the Solid Oxide Fuel Cells (SOFCs) to the intermediate temperature range (500-700 ºC) has become the main challenge for this technology. The electrolyte resistance ... -
Highly efficient La0.8Sr0.2MnO3-δ - Ce0.9Gd0.1O1.95 nanocomposite cathodes for solid oxide fuel cells
Dos Santos-Gómez, Lucía; Zamudio-García, J; Porras-Vázquez, José Manuel; Losilla, E.R.; Marrero-López, David (Elsevier, 2017-12-15)La0.8Sr0.2MnO3-δ-Ce0.9Gd0.1O1.95 (LSM-CGO) nanostructured cathodes are successfully prepared in a single process by a chemical spray-pyrolysis deposition method. The cathode is composed of nanometric particles of approximately ... -
Highly efficient LaCr0.75M0.25O3+δ (M= Ti, Mn, Fe, Co and Cu) nanostructured electrodes for Solid Oxide Fuel Cells
Zamudio-García, J; Porras Vázquez, José Manuel; Losilla, Enrique R.; Marrero-López, David (2019-09-30)Nanostructured composites electrodes based on lanthanum chromites has been prepared using Spray-pyrolysis precursor method achieving better Rp as SOFC electrodes. The performance in real SOFC is still in progress. -
Influence of lanthanum doping on the structure and transport properties of CeO2
Zamudio-García, J; Porras-Vázquez, José Manuel; Dos Santos-Gómez, Lucía; Losilla, Enrique R.; Marrero-López, David (2019-06-10)LaxCe1-xO2-x/2 materials are oxide and/or proton conductors depending on the La-content and they are of interest for numerous electrochemical applications at high temperatures, including membranes for hydrogen separation ... -
Influence of Nb-doping on the structural and electrical properties of lanthanum molybdates, La5.4MoO11.1
López-Vergara, Adrián; Porras-Vázquez, José Manuel; Vollestad, Einar; Canales-Vázquez, J.; Ramirez-Losilla, Enrique; [et al.] (2018-06-28)Nowadays, hydrogen is receiving a great deal of attention as an energy carrier. Commonly, it is obtained by hydrocarbons reforming, such as natural gas, coal and biomass. However, the resulting hydrogen needs to be purified ... -
LaCr0.75Mn0.25O3+δ –CGO nanocomposite electrodes for highly efficient Solid Oxide Fuel Cells
Zamudio-García, J; Porras Vázquez, Jose Manuel; Losilla, Enrique R.; Marrero-López, David (2021-07-24)One of the most recent strategies to enhance the electrode performance is the preparation of nanocomposite materials, leading to an increase of the triple-phase-boundary (TPB) length. In this way, ... -
Nanocrystalline cathodes for PC-SOFCs based on BCZY
Dos-Santos-Gómez, Lucía; Zea-Garcia, Jesus D.; Porras-Vázquez, José Manuel; Marrero-López, David; Ramírez-Losilla, E. (2016-09-27)Perovskites based on BaCeO3-δ exhibit the highest proton conductivity among this class of materials, however, they are susceptible to hydration and carbonation in presence of water vapor and CO2 [1]. In contrast, the ... -
Novel microstructural strategies to enhance the electrochemical performance of La0.8Sr0.2MnO3-δ cathodes
Dos Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Ramirez-Losilla, Enrique; Marrero-López, David (2015-07-13)Solid oxide fuel cells (SOFCs) are one of the most efficient technologies for direct conversion of fuels to electricity. La0.8Sr0.2MnO3-δ (LSM) is the cathode material most widely used in SOFCs [1], however, LSM exhibits ... -
Relationship between the Structure and Transport Properties in the Ce1−xLaxO2−x/2 System
Zamudio-García, J; Porras-Vázquez, José Manuel; Canales-Vázquez, J.; Cabeza-Diaz, Aurelio; Losilla, E.R.; [et al.] (American Chemical Society, 2019-06-25)La-doped CeO2 materials have been widely investigated for potential applications in different high-temperature electrochemical devices, such as fuel cells and ceramic membranes for hydrogen production. However, the crystal ... -
Solid Oxide Fuel Cells based on Lanthanum Tungstates Electrolytes
Porras-Vázquez, José Manuel; Zayas-Rey, María José; Ramirez-Losilla, Enrique; Marrero-López, David; Dos Santos-Gómez, Lucía (2015-07-13)Lanthanum tungstate with composition La27W4NbO55- (LWNO) has been tested as proton conductor electrolyte for Solid Oxide Fuel Cells (SOFCs). For this purpose, different electrodes and composite electrodes are considered, ... -
Stability and electrochemical performance of nanostructured La2CuO4þd cathodes
Dos Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Hurtado, Javier; Losilla, E.R.; Marrero-López, David (Elsevier, 2019-02-21)La2CuO4þd cathode layers are prepared by spray-pyrolysis deposition and their structural, microstructural and electrical properties are compared with those of submicrometric powders obtained from freeze-dried precursors. ... -
Stability of epitaxial heterostructured materials
Dos Santos-Gómez, Lucía; Sanna, Simone; Esposito, Vincenzo; Pryds, Nini; Marrero-López, David; [et al.] (2019)Heterostructured materials are a new family of artificial compounds where the electronic and ionic properties can be modulated by varying the characteristics of the different material layers. These properties arise from ...