Assessment of NiO-CGO composites as cermet precursors

NiO-Ce0.9Gd0.1O1.95 (NiO-CGO) composite powders produced by a one-step chemical route were assessed as precursors of fuel cell anode cermets. Porous NiO-CGO composites were prepared by uniaxial pressing followed by firing at 1400 °C for 4 h. Ni-CGO cermets were subsequently obtained by reduction in...

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Principais autores: Nascimento, Rubens Maribondo do, Grilo, João Paulo de Freitas, Macedo, Daniel Araújo de, Marques, Fernando Manuel Bico
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
One-step synthesis
Composites
Cermets
Microstructure
Electrical properties
Endereço do item:https://repositorio.ufrn.br/handle/123456789/45510
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spelling ri-123456789-455102021-12-21T12:40:29Z Assessment of NiO-CGO composites as cermet precursors Nascimento, Rubens Maribondo do Grilo, João Paulo de Freitas Macedo, Daniel Araújo de Marques, Fernando Manuel Bico One-step synthesis Composites Cermets Microstructure Electrical properties NiO-Ce0.9Gd0.1O1.95 (NiO-CGO) composite powders produced by a one-step chemical route were assessed as precursors of fuel cell anode cermets. Porous NiO-CGO composites were prepared by uniaxial pressing followed by firing at 1400 °C for 4 h. Ni-CGO cermets were subsequently obtained by reduction in 10 vol% H2 + 90 vol% N2 at 750 °C. Similar materials obtained by conventional mechanical mixing of commercial powders were also prepared and tested. The structure and particle size of the calcined material were investigated by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). The electrical properties of all materials were duly studied by impedance spectroscopy (NiO-CGO) (in air and several N2 + O2 gas mixtures) or dc conductivity (Ni-CGO). The total and relative magnitude of impedance arcs observed in the low temperature impedance spectra can be used to obtain significant insight on microstructural characteristics, due to a variable role of NiO when shifting from a well percolated electronic conducting pathway to a dispersed ion-blocking phase. The confirmed superior conductivity of one-step materials was interpreted as a consequence of the presence of a network of well-connected and homogeneously distributed NiO(/Ni) grains, as shown by SEM 2021-12-21T12:40:28Z 2021-12-21T12:40:28Z 2018-08 article GRILO, João P. F.; MACEDO, Daniel A.; NASCIMENTO, Rubens M.; MARQUES, Fernando M. B. Assessment of NiO-CGO composites as cermet precursors. Solid State Ionics, [S.L.], v. 321, p. 115-121, ago. 2018. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0167273818301486?via%3Dihub. Acesso em: 31 mar. 2021. http://dx.doi.org/10.1016/j.ssi.2018.04.014. 0167-2738 https://repositorio.ufrn.br/handle/123456789/45510 10.1016/j.ssi.2018.04.014 en Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic One-step synthesis
Composites
Cermets
Microstructure
Electrical properties
spellingShingle One-step synthesis
Composites
Cermets
Microstructure
Electrical properties
Nascimento, Rubens Maribondo do
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Marques, Fernando Manuel Bico
Assessment of NiO-CGO composites as cermet precursors
description NiO-Ce0.9Gd0.1O1.95 (NiO-CGO) composite powders produced by a one-step chemical route were assessed as precursors of fuel cell anode cermets. Porous NiO-CGO composites were prepared by uniaxial pressing followed by firing at 1400 °C for 4 h. Ni-CGO cermets were subsequently obtained by reduction in 10 vol% H2 + 90 vol% N2 at 750 °C. Similar materials obtained by conventional mechanical mixing of commercial powders were also prepared and tested. The structure and particle size of the calcined material were investigated by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). The electrical properties of all materials were duly studied by impedance spectroscopy (NiO-CGO) (in air and several N2 + O2 gas mixtures) or dc conductivity (Ni-CGO). The total and relative magnitude of impedance arcs observed in the low temperature impedance spectra can be used to obtain significant insight on microstructural characteristics, due to a variable role of NiO when shifting from a well percolated electronic conducting pathway to a dispersed ion-blocking phase. The confirmed superior conductivity of one-step materials was interpreted as a consequence of the presence of a network of well-connected and homogeneously distributed NiO(/Ni) grains, as shown by SEM
format article
author Nascimento, Rubens Maribondo do
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Marques, Fernando Manuel Bico
author_facet Nascimento, Rubens Maribondo do
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Marques, Fernando Manuel Bico
author_sort Nascimento, Rubens Maribondo do
title Assessment of NiO-CGO composites as cermet precursors
title_short Assessment of NiO-CGO composites as cermet precursors
title_full Assessment of NiO-CGO composites as cermet precursors
title_fullStr Assessment of NiO-CGO composites as cermet precursors
title_full_unstemmed Assessment of NiO-CGO composites as cermet precursors
title_sort assessment of nio-cgo composites as cermet precursors
publisher Elsevier
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/45510
work_keys_str_mv AT nascimentorubensmaribondodo assessmentofniocgocompositesascermetprecursors
AT grilojoaopaulodefreitas assessmentofniocgocompositesascermetprecursors
AT macedodanielaraujode assessmentofniocgocompositesascermetprecursors
AT marquesfernandomanuelbico assessmentofniocgocompositesascermetprecursors
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