Wachowski, SL.; Szpunar, I.; Sørby, MH.; Mielewczyk-Gryn, A.; Balaguer Ramirez, M.; Ghica, C.; Cosmin Istrate, M.... (2020). Structure and water uptake in BaLnCo(2)O(6-delta) (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy). Acta Materialia. 199:297-310. https://doi.org/10.1016/j.actamat.2020.08.018
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/190350
Título:
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Structure and water uptake in BaLnCo(2)O(6-delta) (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
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Autor:
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Wachowski, Sebastian Lech
Szpunar, Iga
Sørby, Magnus Helgerud
Mielewczyk-Gryn, Aleksandra
Balaguer Ramirez, Maria
Ghica, Corneliu
Cosmin Istrate, Marian
Gazda, Maria
Gunnæs, Anette E.
Serra Alfaro, José Manuel
Norby,Truls
Strandbakke, Ragnar
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Entidad UPV:
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Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química
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Fecha difusión:
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Resumen:
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[EN] The structure of BaLnCo(2)O(6-delta) (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy) was studied by the means of synchrotron radiation powder X-ray diffraction, neutron powder diffraction and Transmission Electron Microscopy ...[+]
[EN] The structure of BaLnCo(2)O(6-delta) (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy) was studied by the means of synchrotron radiation powder X-ray diffraction, neutron powder diffraction and Transmission Electron Microscopy (TEM), while water uptake properties were analysed with the use of thermogravimetry (TG) and water adsorption isotherms. The structure refinement revealed that the dominant phase in all compositions was orthorhombic with an ordering of the A-site cations along the c-axis and ordering of oxygen vacancies along the b-axis, which was also directly evidenced by TEM. It was shown that both unit cell volume and average Co-oxidation state at room temperature decrease linearly with decreasing Ln radius. TG water uptake experiments in humidified N-2-O-2 gas mixture at 300 degrees C revealed that among all compositions, only BaLaCo2O6-delta and BaGdCo2O6-delta exhibit significant water uptake. Surface water adsorption studies showed that the alpha, a normalised parameter reflecting the surface hydrophilicity, mostly independently of Ln radius was close to 0.5, which means that the surface is neither hydrophobic nor hydrophilic. The results indicated that water uptake observed at 300 degrees C is a bulk process, which cannot be described by standard hydration/hydrogenation reaction and it is related to the layered structure of the perovskite lattice and characteristic to La or Gd being present in the lattice.
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Palabras clave:
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Fuel cell materials
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Neutron diffraction
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X-ray synchrotron radiation
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TEM,Positrode
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Derechos de uso:
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Reserva de todos los derechos
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Fuente:
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Acta Materialia. (issn:
1359-6454
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DOI:
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10.1016/j.actamat.2020.08.018
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Editorial:
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Elsevier
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Versión del editor:
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https://doi.org/10.1016/j.actamat.2020.08.018
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Código del Proyecto:
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación (PEICTI) 2013-2016/PCIN-2017-125/ES/PRINCIPIO EN HIDRATACION DE OXIDOS CONDUCTORES MIXTOS/
...[+]
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación (PEICTI) 2013-2016/PCIN-2017-125/ES/PRINCIPIO EN HIDRATACION DE OXIDOS CONDUCTORES MIXTOS/
info:eu-repo/grantAgreement/RCN//272797//GoPHy MiCO/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-102161-B-I00/ES/CONVERSION DIRECTA DE CO2 EN PORTADORES DE ENERGIA QUIMICA UTILIZANDO REACTORES ELECTROCATALITICOS DE MEMBRANA/
info:eu-repo/grantAgreement/MCIU//IJCI-2017-34110/
info:eu-repo/grantAgreement/NCN//2016%2F22%2FZ%2FST5%2F00691/
info:eu-repo/grantAgreement/AEI//PCIN2017-125/
info:eu-repo/grantAgreement/MCI//PN19-03/
info:eu-repo/grantAgreement/CERIC-ERIC//20187079/
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Agradecimientos:
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The research has been supported by the National Science Centre Poland (2016/22/Z/ST5/00691), the Spanish Government (PCIN2017-125), and the Research Council of Norway (Grant n. 272797 "GoPHy MiCO") through the M-ERA.NET ...[+]
The research has been supported by the National Science Centre Poland (2016/22/Z/ST5/00691), the Spanish Government (PCIN2017-125), and the Research Council of Norway (Grant n. 272797 "GoPHy MiCO") through the M-ERA.NET Joint Call 2016.
Funding from the Spanish Government (RTI2018-102161 and IJCI-2017-34110 grant) is kindly acknowledged.
The authors acknowledge the skilful assistance from the staffof the Swiss-Norwegian Beamline (SNBL), at the European Synchrotron Radiation Facility (ESRF), Grenoble, France. Dr Cheng Li is at POWGEN, SNS, Oak Ridge, US and Dr Chiu C. Tang at beamline I11 at Diamond, Didcot, UK are gratefully acknowledged for PND and SR-PXD measurements, respectively, of BaGdCo 2 O 6-d.
SLW and AMG acknowledge the CERIC-ERIC Consortium for the access to experimental facilities and the financial support (No 20187079).
CG and MCI acknowledge the financial support from Romanian Ministry of Research and Innovation in the frame of the Core Program PN19-03.
SLW would like to express gratitude to Malgorzata Nadolska from Gdansk University of Technology for support in surface measurements and analysis.
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Tipo:
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Artículo
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