Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells

Ca-doped ceria (CCO) electrolytes were prepared using two processing approaches, proteic sol-gel synthesis using gelatin (SG) and solid-state reaction (SSR). Mollusk shell powder was used in the SSR method as the main source of Ca. Materials sintered at 1350–1450 °C exhibited relative density above...

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Principais autores: Nascimento, Rubens Maribondo do, Garcia, Maxwell F. L., Araújo, Allan Jedson Menezes de, Raimundo, Rafael Alexandre, Grilo, João Paulo de Freitas, Macedo, Daniel Araújo de
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Ca-doped ceria
Sol-gel route
Solid-state synthesis
Mollusk shell
Electrical properties
Bulk and grain boundary
Endereço do item:https://repositorio.ufrn.br/handle/123456789/45450
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spelling ri-123456789-454502023-02-07T20:51:12Z Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells Nascimento, Rubens Maribondo do Garcia, Maxwell F. L. Araújo, Allan Jedson Menezes de Raimundo, Rafael Alexandre Grilo, João Paulo de Freitas Macedo, Daniel Araújo de Ca-doped ceria Sol-gel route Solid-state synthesis Mollusk shell Electrical properties Bulk and grain boundary Ca-doped ceria (CCO) electrolytes were prepared using two processing approaches, proteic sol-gel synthesis using gelatin (SG) and solid-state reaction (SSR). Mollusk shell powder was used in the SSR method as the main source of Ca. Materials sintered at 1350–1450 °C exhibited relative density above 95% and different microstructural features regarding grain size and morphology. Impedance spectroscopy in air revealed a comparatively better total electrical response of materials prepared by the proteic sol-gel route. CCO ceramics prepared by the SG route have bulk conductivity four times higher than the highest conductivity of samples processed by the SSR route. Electrical properties of the grain boundaries of both series of materials reveal distinct oxygen vacancy concentration profiles and space charge potentials. The role of processing route and sintering schedules was discussed taking into consideration the distinct impact of Ca interaction in the grain boundaries 2021-12-17T13:54:19Z 2021-12-17T13:54:19Z 2021-05-13 article GARCIA, Maxwell F. L.; ARAÚJO, Allan J. M.; RAIMUNDO, Rafael A.; NASCIMENTO, Rubens M.; GRILO, João P. F.; MACEDO, Daniel A. Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells. International Journal of Hydrogen Energy, [S.L.], v. 46, n. 33, p. 17374-17387, maio 2021. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0360319921007072?via%3Dihub. Acesso em: 24 mar. 2021. http://dx.doi.org/10.1016/j.ijhydene.2021.02.151. 0360-3199 https://repositorio.ufrn.br/handle/123456789/45450 10.1016/j.ijhydene.2021.02.151 en Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Ca-doped ceria
Sol-gel route
Solid-state synthesis
Mollusk shell
Electrical properties
Bulk and grain boundary
spellingShingle Ca-doped ceria
Sol-gel route
Solid-state synthesis
Mollusk shell
Electrical properties
Bulk and grain boundary
Nascimento, Rubens Maribondo do
Garcia, Maxwell F. L.
Araújo, Allan Jedson Menezes de
Raimundo, Rafael Alexandre
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
description Ca-doped ceria (CCO) electrolytes were prepared using two processing approaches, proteic sol-gel synthesis using gelatin (SG) and solid-state reaction (SSR). Mollusk shell powder was used in the SSR method as the main source of Ca. Materials sintered at 1350–1450 °C exhibited relative density above 95% and different microstructural features regarding grain size and morphology. Impedance spectroscopy in air revealed a comparatively better total electrical response of materials prepared by the proteic sol-gel route. CCO ceramics prepared by the SG route have bulk conductivity four times higher than the highest conductivity of samples processed by the SSR route. Electrical properties of the grain boundaries of both series of materials reveal distinct oxygen vacancy concentration profiles and space charge potentials. The role of processing route and sintering schedules was discussed taking into consideration the distinct impact of Ca interaction in the grain boundaries
format article
author Nascimento, Rubens Maribondo do
Garcia, Maxwell F. L.
Araújo, Allan Jedson Menezes de
Raimundo, Rafael Alexandre
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
author_facet Nascimento, Rubens Maribondo do
Garcia, Maxwell F. L.
Araújo, Allan Jedson Menezes de
Raimundo, Rafael Alexandre
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
author_sort Nascimento, Rubens Maribondo do
title Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
title_short Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
title_full Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
title_fullStr Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
title_full_unstemmed Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
title_sort electrical properties of ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
publisher Elsevier
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/45450
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