Article
Alloy exsolution in co-doped PrBaMn₂₋ₓTMₓO₅+δ (TM = Co and/or Ni) obtained by mechanochemistry
Author/s | Gotor Martínez, Francisco José
Sayagués de Vega, María Jesús Zamudio-García, Javier Marrero López, David García-García, Francisco J. |
Department | Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte |
Publication Date | 2024-12 |
Deposit Date | 2024-09-24 |
Abstract | Doped- PrBaMn₂₋ₓTMₓO₅+δ samples with TM = Co and/or Ni were synthesized by a mechanochemical route from stoichiometric oxide precursor mixtures (Pr₆O₁₁,
BaO₂, MnO, NiO and CoO) using a planetary mill at 600 rpm for 150 ... Doped- PrBaMn₂₋ₓTMₓO₅+δ samples with TM = Co and/or Ni were synthesized by a mechanochemical route from stoichiometric oxide precursor mixtures (Pr₆O₁₁, BaO₂, MnO, NiO and CoO) using a planetary mill at 600 rpm for 150 min. A disordered ABO₃ pseudocubic perovskite phase was obtained after the milling process that was transformed, as established by XRD, into the double layered AA’B₂O₅+δ perovskite phase after annealing at 900 ◦C in a reducing atmosphere (10%H₂/Ar). The microstructural characterization by SEM, TEM, and HRTEM ascertained that this reducing treatment induced the exsolution of Ni and Co metallic nanoparticles from the doped samples. Ni-Co alloys were even exsolved when the layered manganite phase was co-doped with both transition metals. It was confirmed that the exsolution process was reversible by switching the working atmosphere from reducing to oxidizing. Polarization resistance values of the doped samples determined in symmetrical cells in air and H₂, as well as the electrochemical performance of electrolyte LSGM-supported planar cells suggested that these samples can be used as symmetrical electrodes in SOFCs. |
Funding agencies | Ministerio de Ciencia e Innovación (MICIN). España European Commission. Fondo Social Europeo (FSO) |
Project ID. | TED2021-132057B-I00 |
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JPS_garcia-garcia_2024_alloy.pdf | 11.51Mb | [PDF] | View/ | |