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

dc.creatorNascimento, Rubens Maribondo do
dc.creatorGarcia, Maxwell F. L.
dc.creatorAraújo, Allan Jedson Menezes de
dc.creatorRaimundo, Rafael Alexandre
dc.creatorGrilo, João Paulo de Freitas
dc.creatorMacedo, Daniel Araújo de
dc.date2021-12-17T13:54:19Z
dc.date2021-12-17T13:54:19Z
dc.date2021-05-13
dc.identifierGARCIA, 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.
dc.identifier0360-3199
dc.identifierhttps://repositorio.ufrn.br/handle/123456789/45450
dc.identifier10.1016/j.ijhydene.2021.02.151
dc.descriptionCa-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
dc.languageen
dc.publisherElsevier
dc.subjectCa-doped ceria
dc.subjectSol-gel route
dc.subjectSolid-state synthesis
dc.subjectMollusk shell
dc.subjectElectrical properties
dc.subjectBulk and grain boundary
dc.titleElectrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells
dc.typearticle


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