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Bahout, M., Managutti, P. B., Dorcet, V., La Salle, A. L. G., Paofai, S. & Hansen, T. C. (2020) In situ exsolution of Ni particles on the PrBaMn2O5 SOFC electrode material monitored by high temperature neutron powder diffraction under hydrogen. J. Mater. Chem. A, 8 3590–3597. 
Added by: Richard Baschera (2020-04-10 12:48:50)   Last edited by: Richard Baschera (2020-04-10 12:56:49)
Type de référence: Article
DOI: 10.1039/c9ta10159d
Numéro d'identification (ISBN etc.): 2050-7488
Clé BibTeX: Bahout2020
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Catégories: ST2E
Mots-clés: anode material, catalyst, double perovskite, electricity production, growth, high-performance, lignocellulosic biomass, material design, nanoparticles, oxide fuel-cells
Créateurs: Bahout, Dorcet, Hansen, La Salle, Managutti, Paofai
Collection: J. Mater. Chem. A
Consultations : 6/188
Indice de consultation : 2%
Indice de popularité : 0.5%
Résumé     
NiO has been incorporated into the Pr0.5Ba0.5MnP3-delta perovskite to produce, upon heating under a hydrogen atmosphere, in situ exsoLved Ni-catalysts supported on the PrBaMn2O5 anode materiaL. Transmission electron microscopy (TEM) and neutron powder diffraction (NPD) showed that the initial composition obtained by annealing in air at 950 degrees C consists of two perovskite phases: orthorhombic Pr0.65Ba0.35Mn0.975Ni0.925O3 (S.G. lbmm, similar to 75 wt%) and 2H -hexagonal BaMnO3-delta (S.G. P6(3)/mcm, similar to 25 wt%). On heating the two-phase sample under wet hydrogen, MnO particLes exsolve at T similar to 500 degrees C meanwhile the orthorhombic phase transforms to tetragonal (S.G. 14/mcm) then to cubic (S.G. Pm (3) over barm) at T similar to 665 degrees C. When the temperature approaches 900 degrees C, the emergence of Ni metal particLes was detected in the neutron diffraction patterns meanwhile the two perovskite phases start to transform into a Ni-free Layered double perovskite, PrBaMn2O5. In situ real time observation of the structural changes under hydrogen atmosphere provided evidence of the simultaneity of Ni exsolution and phase transformation within our timescaLe resolution. From quantitative RietveLd analysis, the fraction of exsoLved nickel represents the whole amount introduced in the synthesis. Impedance spectroscopy measurements in a 5% H-2/Ar atmosphere promising electrochemical performance for the Ni-exsoLved Layered perovskite electrode a polarization resistance of 0.4 Omega cm(2) at 800 degrees C (0.135 Omega cm(2) at 850 degrees C) without any optimization.
  
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