Listar por autor "Porras-Vázquez, José Manuel"
Mostrando ítems 21-40 de 58
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Influence of lanthanum doping on the structure and transport properties of CeO2
Zamudio-García, Javier; 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.; Ramírez-Losilla, Enrique; Marrero-López, David[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 ... -
Investigation of PO4 3- oxyanion-doping on the properties of CaFe0.4Ti0.6O3 d for potential application as symmetrical electrodes for SOFCs
Dos-Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David; Slater, Peter (Elsevier, 2020)
CaTi0.6-xFe0.4PxO3-d (0 x 0.075) perovskite series are investigated as potential symmetrical electrodes for SOFCs. Pure phase compounds with a cubic perovskite structure (s.g. Pm3m) are obtained for x 0.025, while ... -
La0.8Sr0.2MnO3-d-based nanocomposite functional layers for improved cathode efficiency in SOFCs
Caizán-Juanarena, Leire; Zamudio-García, Javier; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David (2022)
Solid Oxide Fuel Cells (SOFC) are efficient electrochemical devices that are able to convert chemical energy in the form of fuels into electricity, but at low operating temperatures they are mainly limited by the high ... -
LaCr0.75Mn0.25O3+δ –CGO nanocomposite electrodes for highly efficient Solid Oxide Fuel Cells
Zamudio-García, Javier; Porras-Vázquez, José 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, ... -
LaCrO3–CeO2-Based Nanocomposite Electrodes for Efficient Symmetrical Solid Oxide Fuel Cells
Zamudio-García, Javier; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David (2022-04-05)
La0.98Cr0.75Mn0.25O3−δ–Ce0.9Gd0.1O1.95 (LCM-CGO) nanocomposite layers with different LCM contents, between 40 and 60 wt %, are prepared in a single step by a spray-pyrolysis deposition method and evaluated as both air and ... -
Lanthanide molybdates, Ln5.4MoO11.1 (Ln = Nd, Sm and Gd), for hydrogen separation membranes
Porras-Vázquez, José Manuel; Zamudio-García, Javier; Marrero-López, David; Losilla, Enrique R. (Advanced Nano Materials, ANM2022, 2022-07-27)
Nowadays, lanthanide molybdates (Ln6-xMoO12-, Ln = La-Lu) are attracting attention as candidates for hydrogen separation membranes due to its high ambipolar proton-electron conductivity. In these compounds, a very high ... -
Lanthanum Molybdates: a comprehensive study for hydrogen separation membranes
(UMA Editorial, 2023)En esta Tesis doctoral, los materiales La6−xMoO12−δ (0 ≤ x ≤ 0.8) se investigan como una nueva familia de conductores cerámicos de protones. Se obtienen diferentes fases polimórficas con estructura romboédrica y cúbica, ... -
LSCF-CGO nanocomposite cathodes deposited in a single step by spraypyrolysis.
Dos-Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Martín-Jiménez, Francisco de Paula; Ramos-Barrado, José Ramón; Marrero-López, David[et al.] (Elsevier, 2018-01-01)
La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O1.95 (LSCF-CGO) nanostructured cathodes with different LSCF-content are prepared in a single step by spray-pyrolysis deposition, simplifying notably the fabrication process compared ... -
Metal carboxyphosphonates-based electrocatalysts
López Vergara, Adrián; El-Refaei, S.M.; Russo, Patricia A.; Vilchez, A; Losilla, Enrique R.; Porras-Vázquez, José Manuel; Olivera-Pastor, Pascual; Pinna, N; Cabeza-Díaz, Aurelio[et al.] (2019-10-01)
Co1-xFex-HPAA metal phosphonates were prepared and pyrolyzed under N2 and H2/Ar flows. The resulting powders were structural and electrochemically characterized by XRD and CV, respectively. The obtained materials possess ... -
Metal-Doping of La5.4MoO11.1 Proton Conductors: Impact on the Structure and Electrical Properties.
López Vergara, Adrián; Porras-Vázquez, José Manuel; Vøllestad, Einar; Canales-Vázquez, J.; Ramírez-Losilla, Enrique; Marrero-López, David[et al.] (American Chemical Society, 2018-10-03)
La5.4MoO11.1 proton conductors with different metal doping (Ca2+, Sr2+, Ba2+, Ti4+, Zr4+, and Nb5+) have been prepared and structurally and electrically characterized. Different polymorphs are stabilized depending on ... -
Modification of the Microstructure and Transport Properties of La2CuO4−δ Electrodes via Halogenation Routes
Dos-Santos-Gómez, Lucía; Zamudio-García, Javier; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David (IOAP-MPDI, 2022-06-16)
dos Santos-Gómez L, Zamudio-García J, Porras-Vázquez JM, R. Losilla E, Marrero-López D. Modification of the Microstructure and Transport Properties of La2CuO4−δ Electrodes via Halogenation Routes. Processes. 2022; 10(6):1206. ... -
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, Enrique (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 ... -
Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3- Cathodes with Di erent Microstructural Architectures
Dos-Santos-Gómez, Lucía; Zamudio-García, Javier; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David (MDPI, 2020-05-30)
Lowering the operating temperature of solid oxide fuel cells (SOFCs) is crucial to make this technology commercially viable. In this context, the electrode e ciency at low temperatures could be greatly enhanced by ... -
Nanostructured composites as active layer to boost cathode performance in Solid Oxide Fuel Cells
Caizán-Juanarena, Leire; Zamudio-García, Javier; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David (2022-04)
Since the efficiency of Solid Oxide Fuel Cells (SOFCs) is largely limited by the high polarization resistance of the cathode, several strategies have been proposed to enhance the electrochemical activity of such electrodes. ... -
Ni-Doped PrBaFe2O5+δ As Symmetrical Electrode for Solid Oxide Cells.
Caizán-Juanarena, Leire; Zamudio-García, Javier; Dos-Santos-Gómez, Lucía; López Vergara, Adrián; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David[et al.] (2023)
The development of new redox stable electrode materials for Solid Oxide Cells (SOFs) have attracted great attention in recent years, since finding suitable compositions to operate efficiently in both fuel cell and electrolyzer ... -
Novel microstructural strategies to enhance the electrochemical performance of La0.8Sr0.2MnO3-δ cathodes
Dos-Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Ramírez-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 ... -
One step synthesis of nanocomposite electrodes for reversible electrochemical cells.
Dos-Santos-Gómez, Lucía; Zamudio-García, Javier; Caizán-Juanarena, Leire; Porras-Vázquez, José Manuel; Ramírez-Losilla, Enrique; Marrero-López, David[et al.] (2023)
The irregular and seasonal disposition of renewable energy requires advanced devices for energy storage and conversion. Reversible electrochemical cells can address this approach by operating as both electrolyzer and fuel ... -
Perspectives on Cathodes for Protonic Ceramic Fuel Cells.
Mather, Glenn; Muñoz-Gil, Daniel; Zamudio-García, Javier; Porras-Vázquez, José Manuel; Marrero-López, David; Pérez-Coll, Domingo[et al.] (MDPI, 2021-06-09)
Protonic ceramic fuel cells (PCFCs) are promising electrochemical devices for the efficient and clean conversion of hydrogen and low hydrocarbons into electrical energy. Their intermediate operation temperature (500–800 ... -
Phase Composition and Transport Properties of oxide ion conductors based on Sr1-xKxGeO3-x/2
Dos-Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Fernández-Palacios, Sara; Compaña Prieto, José Manuel; Cabeza-Díaz, Aurelio (2015-07-13)
Oxide ion conductors have been increasingly studied because of their potential applications in different electrochemical devices, such as, oxygen sensors, membranes for oxygen separation and components of fuel cells. Solid ...