Assessment of NiO-CGO composites as cermet precursors
| dc.contributor.author | Nascimento, Rubens Maribondo do | |
| dc.contributor.author | Grilo, João Paulo de Freitas | |
| dc.contributor.author | Macedo, Daniel Araújo de | |
| dc.contributor.author | Marques, Fernando Manuel Bico | |
| dc.date.accessioned | 2021-12-21T12:40:28Z | |
| dc.date.available | 2021-12-21T12:40:28Z | |
| dc.date.issued | 2018-08 | |
| dc.description.resumo | 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 | pt_BR |
| dc.identifier.citation | 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. | pt_BR |
| dc.identifier.doi | 10.1016/j.ssi.2018.04.014 | |
| dc.identifier.issn | 0167-2738 | |
| dc.identifier.uri | https://repositorio.ufrn.br/handle/123456789/45510 | |
| dc.language | en | pt_BR |
| dc.publisher | Elsevier | pt_BR |
| dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Brazil | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/br/ | * |
| dc.subject | One-step synthesis | pt_BR |
| dc.subject | Composites | pt_BR |
| dc.subject | Cermets | pt_BR |
| dc.subject | Microstructure | pt_BR |
| dc.subject | Electrical properties | pt_BR |
| dc.title | Assessment of NiO-CGO composites as cermet precursors | pt_BR |
| dc.type | article | pt_BR |
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