NiO–CGO in situ nanocomposite attainment: One step synthesis

Cela, Beatriz; Macedo, Daniel A.; Souza, Graziele L.; Martinelli, Antônio Eduardo; Nascimento, Rubens Maribondo do; Paskocimas, C. A.

doi:10.1016/j.jpowsour.2010.11.026

Cited by 43 publications

(37 citation statements)

References 15 publications

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“…In this study, the material obtained from commercial powders is identified as "conventional composite". Details of the one-step powder preparation method can be found elsewhere (16). Briefly, it consists of a novel sol-gel based method, in which resins are obtained from polymeric precursors and then thermally treated to directly produce the NiO-CGO precursor powder (in situ nanocomposite).…”

Section: Methodsmentioning

confidence: 99%

Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis

et al. 2013

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The correlation between the microstructure and electrical properties of NiO-Ce 0.9 Gd 0.1 O 1.95 (NiO-CGO) composites prepared by a one-step synthesis method is reported in the present work, and compared to conventional samples synthesized by mechanically mixing commercial powders. Samples sintered between 1350 and 1450 °C had their microstructures and electrical properties investigated by scanning electron microscopy (SEM) and impedance spectroscopy. The total electrical conductivity in the range of 100 -500 °C of one-step composites is more than one order of magnitude higher than for conventional material. This result is associated to the presence of a network of well-connected and homogeneously distributed NiO grains shown by SEM for the one-step composite, which is responsible for its improved percolative behavior and lower activation energy (0.24 eV at 250 -650 °C).

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Section: Methodsmentioning

confidence: 99%

Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis

et al. 2013

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“…The diffraction pattern was indexed using ICDD file number 75-0158, characterizing a cubic fluorite-type structure (Fm-3m space group) with lattice parameter a = 0.54358+-0.00003 nm. The average crystallite size, calculated using the corrected FWHM (β) in the Scherrer equation, was found to be 12 nm, which is amongst the lowest values reported for doped ceria powders synthesized by other chemical routes [5,14,15].…”

Section: Methodsmentioning

confidence: 75%

“…The quality of the ceramic electrolytes depends on the synthetic route used to prepare the starting powders. Wet chemical routes based in polymeric precursors have been used to prepare homogeneous, highly reactive nanopowders with controlled morphology and good sintering ability . In addition, these methods offer a great potential for using bio‐based, environmentally friendly precursors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ce_0.8Sm_0.2O_1.9 solid electrolyte by a proteic sol‐gel green method

Macedo

Dutra

Nascimento

et al. 2016

Crystal Research and Technology

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The present study reports the synthesis of Ce 0.8 Sm 0.2 O 1.9 solid electrolyte by a novel proteic sol-gel method which uses gelatin as polymerizing agent. The as-synthesized powder material was calcined at 700°C for 2 h, with X-ray diffraction revealing a single cubic phase with lattice parameter a = 0.5435 nm and theoretical density of 7.144 gcm -3 . The average crystallite size is 12 nm, as determined by the Scherrer equation. Impedance spectroscopy revealed a larger resistive contribution of the grain boundaries than that from grain bulk, which, due to its lower activation energy, tends to dominate the total conductivity above 650°C. The total conductivity is in line with literature data for ceramics of the same composition prepared by various methods, thus confirming the potential of the proteic sol-gel method as a green, low cost alternative synthetic route to prepare ceria-based solid electrolytes.

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“…1 [21], ou seja, a incorporação do íon trivalente (com maior raio iônico) causou deformação uniforme na estrutura. Os tamanhos de cristalito (D DRX = 12-15 nm) foram menores que valores típicos reportados na literatura para pós obtidos pelo método da combustão (40-50 nm) [22] e por um método de complexação de citratos (53 nm) [23], ambos preparados sob condições de calcinação similares às usadas neste estudo.…”

Section: Resultsunclassified

Efeitos da dopagem com gadolínia na densificação e nas propriedades elétricas de soluções sólidas Ce0,99-xGdxCu0,01O2-δ

et al. 2017

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INTRODUÇÃOAs células a combustível de óxido sólido (CCOS), dispositivos eletroquímicos que convertem a energia química da reação de combustíveis em eletricidade, vêm se destacando como uma das principais promessas tecnológicas de produção de energia limpa, por apresentar flexibilidade no uso de combustíveis e característica modular [1][2][3][4] Aveiro, Portugal thamyscira@gmail.com, chrystian.m.lima@hotmail.com, ricardopsd@gmail.com, flavia@cear.ufpb.br, grilo. jpf@gmail.com, rajeshayr@gmail.com, damaced@gmail.com Resumo Soluções sólidas à base de céria (CeO 2 ) são materiais promissores para aplicação como eletrólitos de células a combustível de óxido sólido. Apesar das boas propriedades elétricas, um dos principais inconvenientes destes materiais são as altas temperaturas de sinterização (normalmente acima de 1400 °C) necessárias para completa densificação.

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NiO–CGO in situ nanocomposite attainment: One step synthesis

Cited by 43 publications

References 15 publications

Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis

Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis

Synthesis of Ce_0.8Sm_0.2O_1.9 solid electrolyte by a proteic sol‐gel green method

Efeitos da dopagem com gadolínia na densificação e nas propriedades elétricas de soluções sólidas Ce0,99-xGdxCu0,01O2-δ

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NiO–CGO in situ nanocomposite attainment: One step synthesis

Cited by 43 publications

References 15 publications

Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis

Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis

Synthesis of Ce0.8Sm0.2O1.9 solid electrolyte by a proteic sol‐gel green method

Efeitos da dopagem com gadolínia na densificação e nas propriedades elétricas de soluções sólidas Ce0,99-xGdxCu0,01O2-δ

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Synthesis of Ce_0.8Sm_0.2O_1.9 solid electrolyte by a proteic sol‐gel green method