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83 results on '"Gauthier, Gilles H."'

20. Study of La1.5Sr1.5Mn1.5Ni0.5O7±δ as Solid Oxide Fuel Cell anode material

Author

Sandoval, Mónica V., Palencia, S., Flórez, S., Cárdenas, Carolina, Vecino-Mantilla, J.S., Pirovano, Caroline, Gauthier-Maradei, Paola, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

21. Excellent catalytic performance of a novel exsolved Ni-doped manganite for the steam reforming of methane in SOFC operating conditions

Author

Vecino-Mantilla, J.S., Fabuel, M., Huvé, Marielle, Gardoll, Olivier, Roussel, Pascal, Serra, J.M, Gauthier, Gilles H., Gauthier-Maradei, Paola, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

22. From perovskite to lamellar structures for Symmetrical Solid Oxide Fuel Cell Electrode

Author

Moreno, Zulma L., Sandoval, Mónica V., Mogni, Liliana, Pirovano, Caroline, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

23. From perovskite to lamellar structures for Symmetrical-Solid Oxide Fuel Cell Electrode

Author

Moreno, Zulma L., Sandoval, Mónica V., Mogni, Liliana, Pirovano, Caroline, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

24. Redutibilidade e comportamento catalítico da fase Ruddlesden-Popper La 0,25 Sr 1,75 MnO 4 preparada pelo método de Pechini modificado

Author

Calderón, Reinaldo, Larrondo, Susana, and Gauthier, Gilles H.

Subjects
ánodo, manganita, oxidação Catalítica, anode, manganite, XRD, TPR, SOFC, oxidación Catalítica, anodo, catalytic oxidation
Abstract

Few studies have been reported concerning the use of manganite compounds (La,Sr)2MnO4 of Ruddlesden-Popper structure type as Solid Oxide Fuel Cells (SOFCs) electrode materials; in particular, on the anode side. In the present work La0.25 Sr 1.75 MnO 4 compound was synthesized by a modified Pechini method. This prepared manganite was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and its structure was analyzed into detail by refinement of recorded XRD profiles. La0.25Sr1.75MnO4 was also subjected to a reducibility study through Temperature Programmed Reduction (TPR) and the catalytic properties for total and/or partial oxidation of methane were evaluated. Estimated values of lattice parameters in the refinement are in good agreement with those reported in the literature for various neighbored compositions of the series. The reduction of the material in diluted H2 occurs in several stages and the decomposition starts above 800°C. In the catalytic studies, the material acts as a catalyst for total oxidation of methane even in oxygen deficient atmospheres. Resumen Se han reportado pocos estudios sobre el uso de compuestos de manganeso (La,Sr)2MnO4 de estructura tipo Ruddlesden-Popper, como electrolitos de Celdas de Combustible de Óxido Sólido (SOFC), en particular como ánodos. En este trabajo el compuesto La0,25Sr1,75MnO4 fue sintetizado por el método de Pechini modificado. Este material fue estudiado por la técnica de Difracción de Rayos X (XRD), Microscopía Electrónica de Barrido (SEM) y su estructura analizada en detalle mediante refinamiento de los patrones de difracción de rayos X. La0,25Sr1,75MnO4 fue sometido a un estudio de Reducción a Temperatura Programada (TPR) y se evaluaron sus propiedades catalíticas para la oxidación total y/o parcial de metano. Los parámetros de celda estimados en el refinamiento son bastante próximos con los reportados en la literatura para series con composiciones cercanas. La reducción del material en H2 diluido ocurre en múltiples etapas y la descomposición comienza por encima de 800°C. En los estudios catalíticos el material actúa como catalizador para la oxidación total de metano incluso en atmósferas deficientes de oxígeno. Resumo Poucos estudos têm sido reportados sobre o uso de compostos de manganésio (La,Sr)2MnO4 de estrutura tipo Ruddlesden-Popper, como eletrólitos de Células de Combustível de Oxido Solido (SOFC), em particular como ânodos. No presente trabalho o composto La0,25 Sr 1,75 MnO 4 foi sintetizado pelo método de Pechini modificado. O material foi estudado pela técnica de Difração de Raios-X (XRD), Microscopia Eletrônica de Varredura (SEM) e sua estrutura analisada em detalhe mediante refinamento. La0,25 Sr 1,75 MnO 4 foi sometido a um estudo de Redução a Temperatura Programada (TPR) e foram avaliadas as propriedades catalítica para a oxidação total e/ou parcial de metano. Os parâmetros de rede estimados no refinamento são muito parecidos com os reportados na literatura para series com composições próximas. A redução do material em H2 diluído ocorre em múltiplos estágios e a decomposição começa por cima de 800°C. Nos estudos catalíticos o material atua como catalisador para a oxidação total de metano mesmo em atmosferas deficientes de oxigeno.

Published
2017

25. Study of pure and Zr-substituted YMnO3 materials as Solid Oxide Fuel Cell Cathode

Author

Moreno, Zulma L., Grimaldos, N., Montenegro, A., Pirovano, Caroline, Świerczek, Konrad, Mogni, Liliana, Caneiro, Alberto, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

26. Synthesis and study of NdxM2-xMnO4±δ (M: Ca, Sr) as Symmetric SOFC electrode materials

Author

Durán, Silvia, Prada, Andrea, Sandoval, Mónica V., Pirovano, Caroline, Świerczek, Konrad, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

27. La0.5Sr1.5MnO4±δ as promising electrode material for Symmetrical Solid Oxide Fuel Cell

Author

Cárdenas, Carolina, Sandoval, Mónica V., Pirovano, Caroline, Capoen, Edouard, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

28. Study of La4BaCu5-xCoxO13±δ material as potential cathode for IT-SOFC

Author

Durán, Silvia, Tellez, Jhoan, Macias, M., Roussel, Pascal, Świerczek, Konrad, Suescun, Leopoldo, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

29. Stabilization of YMnO3 in Reducing Atmosphere for Use as SOFC Anode Material

Author

Moreno, Zulma L., Orozco, C., Grimaldos, N., Domínguez, N., Pirovano, Caroline, Świerczek, Konrad, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

30. Performance of La0.5Sr1.5MnO4±δ as electrode material for symmetrical Solid Oxide Fuel Cell

Author

Sandoval, Mónica V., Cárdenas, Carolina, Pirovano, Caroline, Capoen, Edouard, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

31. Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions.

Author

Vecino‐Mantilla, Sebastián, Quintero, Erika, Fonseca, Camilo, Gauthier, Gilles H., and Gauthier‐Maradei, Paola

Subjects
STEAM reforming, NATURAL gas, CATALYTIC reforming, ANODES, MANGANITE, GAS mixtures
Abstract

The catalytic behavior of the new Ni exsolved Ruddlesden‐Popper (RP) manganite (La1.5Sr1.5Mn1.5Ni0.5O7) for the reforming reaction was studied. The material was synthesized by the Pechini method and reduced to induce the formation of two phases: n=1 RP structure LaSrMnO4 decorated with Ni nanoparticles. Ni impregnation on (La,Sr)2MnO4 ceramic support of similar composition was also prepared for comparison. The catalytic measurements were carried out in a reduction‐reaction process with low steam to carbon content (S/C=0.15) at 700, 800 and 850 °C. The exsolved material exhibits a better performance than the impregnated for the methane steam reforming reaction, especially at 850 °C with higher conversion and H2 production rate. However, in light alkane gas mixtures (CH4−C2H6 and CH4−C3H8), the behavior is affected due to the competition between reactions and low available metallic active sites, without affecting the H2 production. The exceptional overall results considering this new material as a promising anode material in a SOFC fed with Colombian natural gas. [ABSTRACT FROM AUTHOR]

Published
2020
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32. Grinding and Milling: Two Efficient Methodologies in the Solvent-Free Phosphomolybdic Acid-Catalyzed and Mechanochemical Synthesis of cis-4-Amido-N-yl-2-methyl-tetrahydroquinolines

Author

Kouznetsov,Vladimir V., Merchán-Arenas,Diego R., Martínez-Bonilla,Carlos A., Macías,Mario A., Roussel,Pascal, and Gauthier,Gilles H.

Subjects
phosphomolybdic acid catalyst, solvent-free Povarov reaction, mechano-chemical milling, ABB' Povarov type reaction
Abstract

The ball-milling process of ABB' Povarov reaction through mechano-chemical activation with phosphomolybdic acid (PMA) as heteropolyacid (HPA) catalyst, was first time explored. The developed high speed vibratory ball milling (HSVBM) green method offers simple and efficient diastereoselective synthesis of cis-2,4-disubstituted tetrahydroquinolines in good to excellent yields (56-76%).

Published
2016

33. Synthesis and characterization of pure and Zr-substituted YMnO3 compounds as SOFC electrode

Author

Moreno Botello, Zulma Liliana, Caneiro, Alberto, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

34. La substituted Sr2MnO4 as candidate for symmetrical electrode for SOFC

Author

Sandoval, Mónica V., Pirovano, Caroline, Capoen, Edouard, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

35. Anion-Driven Structure and Properties Modification in Some Layered Inorganic Compounds

Author

Kabbour, Houria, Tessier, Franck, Pussacq, Tanguy, Huvé, Marielle, Gauthier, Gilles H., Roussel, Pascal, Mentre, Olivier, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Université de Lille, LillOA

Subjects
[CHIM.INOR] Chemical Sciences/Inorganic chemistry, [CHIM.INOR]Chemical Sciences/Inorganic chemistry
Abstract

International audience

Published
2016

36. Synthesis, characterization and electrical properties of Sr2-xLaxMnO4±δ (0.25≤x≤0.6) series for SOFC electrode

Author

Sandoval, Mónica V., Pirovano, Caroline, Capoen, Edouard, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

37. Anion-Driven Structure and Properties Modification in Some Layered Oxides: From Magnetism to Catalysis

Author

Kabbour, Houria, Pussacq, Tanguy, Tessier, Franck, Huvé, Marielle, Guerrero-Caballero, Jesús, Löfberg, Axel, Roussel, Pascal, Gauthier, Gilles H., Mentre, Olivier, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
Abstract

International audience

Published
2015

38. In situ high temperature neutron diffraction study of A-site ordered double perovskite manganites for use as fuel electrode in solid oxide fuel cells

Author

Bahout, M., Tonus, F., Gauthier, Gilles H., Macías, Mario A., Roussel, Pascal, Smith, R.I., Skinner, S.J., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

39. Synthesis and preliminary characterization of Sr2-xLaxMnO4±δ (0.25≤x≤0.6) series as symmetric SOFC electrode

Author

Sandoval, Mónica V., Pirovano, Caroline, Capoen, Edouard, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

40. Synthesis and preliminary study of pure and Zr-substituted YMnO3 compounds as Solid Oxide Fuel Cells electrode

Author

Moreno, Zulma L., Caneiro, Alberto, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

41. Stabilization of YMnO3 in reducing atmosphere as Solid Oxide Fuel Cells anode material

Author

Moreno, Zulma L., Koop, C.I., Vela, F., Domínguez, O.J., Melo, X.P., Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

42. Synthesis and study of the ordered double perovskite NdBaMn2O5+d to be used as symmetric SOFC electrode material

Author

Pineda, Oscar L., Moreno Botello, Zulma Liliana, Roussel, Pascal, Świerczek, Konrad, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

43. Topotactic anion sub-lattice modifications of 2D inorganic compounds

Author

Kabbour, Houria, Mentre, Olivier, Roussel, Pascal, Pussacq, Tanguy, Huvé, Marielle, Tessier, Franck, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Université de Lille, LillOA

Subjects
[CHIM.INOR] Chemical Sciences/Inorganic chemistry, [CHIM.INOR]Chemical Sciences/Inorganic chemistry
Abstract

International audience

Published
2015

44. Thermal stability and compatibility with SOFC/PCFC electrolyte of La4BaCu5O13+δ and La6.4Sr1.6Cu8O20±δ perovskites

Author

Sandoval, Mónica V., Martinez, Nelson G., Vázquez-Cuadriello, Santiago, Macías, Mario A., Suescun, Leopoldo, Roussel, Pascal, Gauthier, Gilles H., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

45. Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions.

Author

Vecino‐Mantilla, Sebastián, Gauthier‐Maradei, Paola, Huvé, Marielle, Serra, José Manuel, Roussel, Pascal, and Gauthier, Gilles H.

Subjects
STEAM reforming, INTERSTITIAL hydrogen generation, MANGANITE, NICKEL, WATER gas shift reactions
Abstract

An original way to perform the exsolution of Ni nanoparticles on a ceramic support was explored for the development of methane steam reforming catalyst in SOFC anode conditions. The n=2 Ruddlesden‐Popper (RP) phase La1.5Sr1.5Mn1.5Ni0.5O7±δ has been synthesized by the Pechini method and subsequently reduced with an H2‐N2 mixture at different temperatures and reducing times to induce the formation of two phases: LaSrMnO4 (n=1 RP) decorated with metallic Ni nanoparticles. Preliminary measurements of catalytic behavior for the steam reforming have been carried out in a reduction‐reaction process with a mixture of 82 mol %CH4, 18 mol %N2 and low steam to carbon ratio (S/C=0.15). The catalyst exhibits a selectivity for CO production (0.97), 14.60 mol % CH4 conversion and around 24.19 mol % H2 production. Such catalytic behavior was maintained for more than 4 h, with a constant rate of hydrogen production and CH4 conversion rate. [ABSTRACT FROM AUTHOR]

Published
2019
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46. Pure and Zr-doped YMnO3+δ as a YSZ-compatible SOFC cathode: a combined computational and experimental approach.

Author

Moreno Botello, Zulma L., Montenegro, Alejandra, Grimaldos Osorio, Nicolas, Huvé, Marielle, Pirovano, Caroline, Småbråten, Didrik R., Selbach, Sverre M., Caneiro, Alberto, Roussel, Pascal, and Gauthier, Gilles H.

Abstract

A thorough study of the Y1−xZrxMnO3+δ series is presented with the objective to use these materials as SOFC cathodes. These pure and Zr-doped yttrium manganites exhibit a layered hexagonal structure similar to a peculiar 5-fold bipyramidal coordination of manganese that makes them intrinsically different from the traditional cube-like perovskite with [MnO6] octahedra, creating the conditions conducive for oxygen uptake at a low temperature in the case of the layered manganite. Zr for Y doping enables the maintenance of oxygen excess such as interstitial oxygen atoms (Oi) located in the equatorial plane of the bi-pyramids. These over-stoichiometric interstitial oxygen sites are clearly evidenced by the maximum entropy method (MEM) applied to neutron diffraction data, and density functional theory (DFT) calculations are used to model the structural accommodation of Zr and excess oxygen. Mn reduction to Mn2+ is found to be energetically unfavourable, as proved both experimentally and by DFT calculations. Hence, zirconium is found to both stabilize the excess oxygen compared to pure YMnO3 and possibly provide an oxygen ion migration path with a lower energy barrier. The main consequence is a possible MIEC behaviour in Zr-doped YMnO3, as suggested by both the conductivity measurements and theoretical calculations. The initial EIS measurements are very promising and raise the series and its original structure to the rank of materials of interest for application as SOFC electrodes. [ABSTRACT FROM AUTHOR]

Published
2019
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47. Synthesis and characterization of gold-containing oxides of K2NiF4 or Nd2CuO4 structure type.

Author

Rodríguez Delgado, Jerffersson, García Rojas, Verónica, and Gauthier, Gilles H.

Subjects
CHEMICAL synthesis, LITHIUM, CATALYTIC activity, ACID catalyst activity, CATION analysis, ION analysis
Abstract

In this work, different materials of Nd2CuO4 and K2NiF4 Ruddlesden-Popper structure have been prepared by solid-state reaction in air and high temperatures. The powders of mixed oxides, of general formula La2Li0.5M0.5 − xAuxO4 (M = Cu, Ni), were prepared from [Au(NH3)4](NO3)3 as gold source. The stoichiometric proportions of the all reagents (including La2O3, NiCO3, CuO) were grounded with a LiOH excess as mineralizer, pressed to form into pellets and heated in static air at temperatures between 750 and 850 °C for several hours. Structural characterization of the synthesized oxides using X-ray diffraction (XRD) are presented. La2Li0.5Au0.5O4, La2Li0.5Cu0.5O4, and La2Li0.5Ni0.5O4, three previously known oxides, were obtained. As expected, La2Li0.5Ni0.5O4 and La2Li0.5Cu0.5O4 consist of an ordered K2NiF4 Ruddlesden-Popper structure, while the La2Li0.5Au0.5O4 compound exhibits a Nd2CuO4 type structure. On the other hand, the preparation of the new proposed group La2Li0.5M0.5 − xAuxO4 (x = 0.0125-0.5) containing gold and nickel/copper simultaneously, under the studied conditions, was not possible. The experimental results revealed that the host structures are intolerant with respect to M (Cu or Ni) and Au cation double substitution. The difficulty to obtain the new phases is discussed regarding the exceptional instability displayed by the trivalent state of gold ion (Au3+) and the soft interactions of this specie with the lithium cation. Finally, the monophasic oxides, more interesting in terms of catalytic activity, were analyzed by temperature-programmed reduction (TPR-H2). [ABSTRACT FROM AUTHOR]

Published
2018
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49. Reducibility and catalytic behavior of La0.25Sr1.75MnO4 Ruddlesden-Popper phase prepared by a modified Pechini method.

Author

Calderón, Reinaldo, Larrondo, Susana, and Gauthier, Gilles H.

Subjects
MANGANITE, CATALYSIS, SOLID oxide fuel cells
Abstract

Copyright of Revista ION is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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50. Redox behavior of the SOFC electrode candidate NdBaMn2O5+δ investigated by high-temperature in situ neutron diffraction: first characterisation in real time of an LnBaMn2O5.5 intermediate phase.

Author

Tonus, Florent, Bahout, Mona, Dorcet, Vincent, Gauthier, Gilles H., Paofai, Serge, Smith, Ronald I., and Skinner, Stephen J.

Abstract

The structural behavior of the tetragonal NdBaMn2O5 phase, a member of the family of A-site ordered layered manganites that have been recently suggested as possible mixed ionic and electronic conductors, has been investigated by means of in situ neutron powder diffraction. Considering applications in energy production and storage devices and use of NdBaMn2O5+δ as an electrode in symmetrical cells, the study was carried out in relevant atmosphere conditions, i.e. dilute hydrogen (wet and dry) and dry air in the temperature range 25–800 °C. Neutron data under flowing hydrogen allowed monitoring of the structural phase transition from the charge-ordered to the charge-disordered state as a function of temperature. Slow reduction of the fully oxidised phase, NdBaMn2O6, previously formed from quick oxidation of the pristine material, enabled real-time observation of the intermediate NdBaMn2O5.5 phase and its crystal characterization up to 700 °C in the course of its conversion to NdBaMn2O5. Oxygen vacancy ordering within the Nd layers of NdBaMn2O5.5 correlated with antiferrodistortive orbital ordering of the Jahn–Teller Mn3+ ion in the square pyramids and octahedra results in large thermal expansion and relatively slow anisotropic oxygen diffusion occurring in the NdO layer. The four heating/cooling cycles evidenced no oxygen miscibility between the three distinct phases detected in the NdBaMn2O5+δ system with δ∼ 0, 0.5 and 1 and clearly demonstrated that reversible oxygen intercalation/deintercalation underpins the phase stability of the LnBaMn2O5+δ materials to redox cycling and to wet atmosphere in high temperature electrochemical devices. [ABSTRACT FROM AUTHOR]

Published
2016
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