RT Conference Proceedings
T1 Study of mixed molybdates of lanthanum and praseodymium, La5.4-xPrxMo1-yNbyO12-δ, for H2 separation membranes
A1 Sánchez Caballero, Abraham
A1 Porras-Vázquez, José Manuel
A1 Dos-Santos-Gómez, Lucía
A1 Zamudio-García, Javier
A1 Infantes-Molina, Antonia
A1 Marrero-López, David
A1 Ramírez-Losilla, Enrique
K1 Química inorgánica
AB This research explores the impact of praseodymium and niobium doping on the La5.4-xPrxMo1-yNbyO12-􀀀 _series (x= 1.35, 2.7, 4.05, 5.4; y= 0, 0.1) as materials with mixed proton-ionic conductivity suitable for hydrogen separation membranes with two main objectives: i) enhancing the electronic conductivity through praseodymium doping, and ii) increasing oxide ion vacancies to improve the ionic conductivity via niobium doping. Material synthesis involves the freeze-drying method, and characterizationincludes X-ray diffraction (Rietveld method), X-ray photoelectron spectroscopy, scanning and transmission electron microscopy and complex impedance spectroscopy. The symmetry of the materials (cubic or rhombohedral) is influenced by synthetic conditions and composition, compositions with higher praseodymium content exhibit a consistent cubic fluorite-type structure. Optimal conductivity is observed in a nitrogen atmosphere for compositions with high praseodymium content due to thepresence of the Pr4+/Pr3+ pair. In a reducing atmosphere (wet 5%H2-Ar), conductivity significantly decreases due to the reduction of Pr4+ to Pr3+.
YR 2024
FD 2024-01
LK https://hdl.handle.net/10630/29500
UL https://hdl.handle.net/10630/29500
LA eng
NO PID2019-110249RB-I00, Ministerio de Ciencia e Innovación.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026