Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis

Paskocimas, Carlos Alberto; Araújo, Allan Jedson Menezes de; Grilo, João Paulo de Freitas; Loureiro, Francisco J. A.; Holz, Laura I. V.; Macedo, Daniel Araújo de; Fagg, Duncan Paul

Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis

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dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Araújo, Allan Jedson Menezes de
dc.contributor.author	Grilo, João Paulo de Freitas
dc.contributor.author	Loureiro, Francisco J. A.
dc.contributor.author	Holz, Laura I. V.
dc.contributor.author	Macedo, Daniel Araújo de
dc.contributor.author	Fagg, Duncan Paul
dc.date.accessioned	2021-03-26T19:48:20Z
dc.date.available	2021-03-26T19:48:20Z
dc.date.issued	2020-09-21
dc.description.resumo	Gd-doped ceria (Ce1-xGdxO2-d; x = 0, 0.1 and 0.2) is one of the best ceramic electrolytes for application in solid oxide electrochemical devices. This work reports an innovative and environmentally friendly route known as ‘‘proteic sol–gel synthesis’’ using gelatin for their preparation. Materials are characterized via hermogravimetric analysis, X-ray diffractometry, scanning electron microscopy, Raman and X-ray photoelectron spectroscopies, and electrochemical impedance spectroscopy. The proposed method allows to produce pure phase nanosized powders at 400 C that exhibit excellent sinterability at 1350 C. Significant differences are found in the bulk at lower temperatures, with estimated defect association enthalpies of 0.45 and 0.56 eV for the compositions containing 10 and 20 mol% Gd, respectively, leading to an increased bulk conductivity in the first case. In contrast, identical grain boundary Schottky barrier height values of around 0.2 V are a possible result of the relatively low sintering temperature, decreasing the extent of the acceptor dopant segregation to the grain boundaries due to insufficient cation mobility. This leads to similar specific grain boundary characteristics in both doped compositions. Overall, this work provides a rational understanding of a novel route for the synthesis of CGO ceramics with competitive performance and decreased sintering temperature	pt_BR
dc.identifier.citation	ARAÚJO, Allan J. M.; GRILO, João P. F.; LOUREIRO, Francisco J. A.; HOLZ, Laura I. V.; MACEDO, Daniel A.; FAGG, Duncan P.; PASKOCIMAS, Carlos A.. Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis. Journal of Materials Science, [S.L.], v. 55, n. 36, p. 16864-16878, 21 set. 2020. Disponível em: https://link.springer.com/article/10.1007%2Fs10853-020-05173-6. Acesso em: 02 dez. 2020. http://dx.doi.org/10.1007/s10853-020-05173-6.	pt_BR
dc.identifier.doi	10.1007/s10853-020-05173-6
dc.identifier.issn	0022-2461
dc.identifier.issn	1573-4803
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32006
dc.language	en	pt_BR
dc.publisher	Springer	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Proteic sol–gel	pt_BR
dc.subject	Synthesis of Gd-doped ceria	pt_BR
dc.subject	Comprehensive structural	pt_BR
dc.subject	Chemical	pt_BR
dc.subject	Microstructural	pt_BR
dc.subject	Electrical analysis	pt_BR
dc.title	Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis	pt_BR
dc.type	article	pt_BR