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

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 a...

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Principais autores:	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
Formato:	article
Idioma:	English
Publicado em:	Springer
Assuntos:	Proteic sol–gel Synthesis of Gd-doped ceria Comprehensive structural Chemical Microstructural Electrical analysis
Endereço do item:	https://repositorio.ufrn.br/handle/123456789/32006
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spelling	ri-123456789-320062021-03-28T08:53:25Z 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 Comprehensive structural Chemical Microstructural Electrical analysis 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 2021-03-26T19:48:20Z 2021-03-26T19:48:20Z 2020-09-21 article 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. 0022-2461 1573-4803 https://repositorio.ufrn.br/handle/123456789/32006 10.1007/s10853-020-05173-6 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Springer
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	Proteic sol–gel Synthesis of Gd-doped ceria Comprehensive structural Chemical Microstructural Electrical analysis
spellingShingle	Proteic sol–gel Synthesis of Gd-doped ceria Comprehensive structural Chemical Microstructural 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
description	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
format	article
author	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
author_facet	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
author_sort	Paskocimas, Carlos Alberto
title	Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis
title_short	Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis
title_full	Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis
title_fullStr	Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis
title_full_unstemmed	Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis
title_sort	proteic sol–gel synthesis of gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis
publisher	Springer
publishDate	2021
url	https://repositorio.ufrn.br/handle/123456789/32006
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Proteic sol–gel synthesis of Gd-doped ceria: a comprehensive structural, chemical, microstructural and electrical analysis

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