Significant impact of nitric acid treatment on the cathode performance of Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite oxide via combined EDTA–citric complexing process

Zhou, Wei; Ran, Ran; Shao, Zongping; Gu, Hong Xia; Jin, Wan Qin; Xu, Nan

doi:10.1016/j.jpowsour.2007.08.087

Cited by 50 publications

(27 citation statements)

References 45 publications

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“…The Ba1−xSrxCe0.8Y0.2O 3−ı powder was prepared by a modified Pechini method [33,34]. Starting materials Ba(NO3)2 (Alfa Aesar, 99.95%), Sr(NO3)2 (Alfa Aesar, 99%), Ce(NO3)3·6H2O (Alfa Aesar, 99.5%) and Y(NO3)3·6H2O (Alfa Aesar, 99.9%) were dissolved in deionized water and the nitrate concentration of the metal ions was determined through a titration method.…”

Section: Preparationmentioning

confidence: 99%

Stability and electrical property of Ba1−xSrxCe0.8Y0.2O3−δ high temperature proton conductor

Wang

Zhao

Zhang

et al. 2010

Journal of Alloys and Compounds

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Section: Preparationmentioning

confidence: 99%

Stability and electrical property of Ba1−xSrxCe0.8Y0.2O3−δ high temperature proton conductor

Wang

Zhao

Zhang

et al. 2010

Journal of Alloys and Compounds

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“…Such a result might suggest that nitric acid contributes to oxygen retention in the solids, possibly by a mechanism involving impaired migration of oxygen ions through the bulk. A related report has been made recently by Zhou et al, 36 who observed a significant detrimental effect of HNO 3 on oxygen permeation through a dense mixed metal oxide membrane employed as the cathode in solid oxide fuel cells. In this type of system, an oxygen molecule first adsorbs over the membrane surface on the oxygen-rich side, where it dissociates into oxygen ions and generates electron holes, both of which then migrate through the bulk to the other side of the membrane surface.…”

Section: Sem/eds Investigationsmentioning

confidence: 60%

“…According to these authors, the use of nitric acid in the mixed metal oxide synthesis led to the decrease of crystallite size, increase of sintering during fabrication, and reduced surface oxygen exchange kinetics and bulk diffusion rate in the cell cathode. 36 This behaviour has been correlated with the higher sinterability of ceramics produced in the presence of HNO 3 , 36,37 which show lower grain porosity after heat treatment and a decreased effective surface area for reactions carried out after sintering.…”

Section: Sem/eds Investigationsmentioning

confidence: 94%

Synthesis of Fe/Ti oxides from a single source alkoxide precursor under inert atmosphere

Camargo¹,

Nunes²,

Luis³

et al. 2008

J. Braz. Chem. Soc.

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O alcóxido heterometálico [FeCl{Ti 2 (OPr i ) 9 }] (1) foi utilizado como um precursor de fonte única para a preparação de óxidos de Fe/Ti sob atmosfera inerte. Três procedimentos sintéticos distintos foram adotados no processamento de 1, com o emprego de soluções aquosas ácidas (HNO 3 ou HCl), ou na ausência de ácido mineral. Os produtos foram caracterizados por difratometria de raios X (pó), microscopia eletrônica de varredura combinada com espectroscopia de dispersão de raios X (MEV/EDS) e espectroscopias Raman, de ressonância paramagnética eletrônica (RPE) e Mössbauer. Os óxidos produzidos contêm titânio(IV) e ferro(III) (ou ferro(II)), dependendo das condições de reação e das temperaturas de tratamento térmico. Uma interessante redução de ferro(III) a ferro(II), que levou à obtenção de ilmenita (FeTiO 3 ), foi observada a 1000 o C no sistema contendo HNO 3 . Estudos por MEV/EDS revelaram uma distribuição altamente heterogênea dos metais em todos os produtos, possivelmente relacionada com a presença de um conteúdo significativo de carbono e de defeitos estruturais (vacâncias de oxigênio) nos sólidos.The heterometal alkoxide [FeCl{Ti 2 (OPr i ) 9 }] (1) was employed as a single source precursor for the preparation of Fe/Ti oxides under inert atmosphere. Three different synthetic procedures were adopted in the processing of 1, either employing aqueous HNO 3 or HCl solutions, or in the absence of mineral acids. Products were characterised by powder X-ray diffractometry, scanning electron microscopy combined with energy dispersive X-ray spectroscopy (SEM/EDS) and Raman, electron paramagnetic resonance (EPR) and Mössbauer spectroscopies. Oxide products contained titanium(IV) and either iron(III) or iron(II), depending on reaction conditions and thermal treatment temperatures. An interesting iron(III)→iron(II) reduction was observed at 1000 o C in the HNO 3 -containing system, leading to the detection of ilmenite (FeTiO 3 ). SEM/EDS studies revealed a highly heterogeneous metal distribution in all products, possibly related to the presence of a significant content of carbon and of structural defects (oxygen vacancies) in the solids.Keywords: oxides, sol-gel, single source precursor, inert atmosphere, electron microscopy IntroductionMultimetal oxide systems play an important role in materials science. They have been extensively investigated for the development of high performance ceramics and (nano)composites, aiming at applications in optics, electronics, magnetism and catalysis. The development of structural components, energy conversion devices, sensors and MRI contrast agents has also benefited from heterometal oxide research. [1][2][3][4] Nowadays, the preparation of these oxides is often performed by chemical methods. 3,[5][6][7] In particular, the sol-gel process, either hydrolytic or non-hydrolytic, has been widely employed due to its advantages over conventional solid state methods. These advantages include lower processing temperatures and better control over microstructure, uniformity and stoichiometry o...

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“…20 First, EDTA (Riedel-de Haën, 98%) was mixed with 6 M NH 4 OH to form an NH 3 -EDTA solution, in which Sr(NO 3 ) 2 (Alfa Aesar, 99.0%), Ce(NO 3 ) 3 ·6H 2 O, and Zr(NO 3 ) 2 ·2H 2 O (Alfa Aesar, 99.0%), and Y(NO 3 ) 3 ·6H 2 O (J.T. Baker, 99.8%) were dissolved.…”

Section: Methodsmentioning

confidence: 99%

“…Iwahara et al [7,10] first reported proton conductivity in SrCeO 3 perovskite materials doped in a hydrogen-containing electrical properties and hydrogen permeation of SrCeO 3 . [18][19][20] When a portion of Ce 4+ is replaced with Y 3+ , oxygen vacancies are generated to maintain the charge neutrality, as follows:…”

Section: Introductionmentioning

confidence: 99%

The proton conduction and hydrogen permeation characteristic of Sr(Ce0.6Zr0.4)0.85Y0.15O3−δ ceramic separation membrane

Hung

Chiang

Jang

et al. 2015

Journal of the European Ceramic Society

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Significant impact of nitric acid treatment on the cathode performance of Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite oxide via combined EDTA–citric complexing process

Cited by 50 publications

References 45 publications

Stability and electrical property of Ba1−xSrxCe0.8Y0.2O3−δ high temperature proton conductor

Stability and electrical property of Ba1−xSrxCe0.8Y0.2O3−δ high temperature proton conductor

Synthesis of Fe/Ti oxides from a single source alkoxide precursor under inert atmosphere

The proton conduction and hydrogen permeation characteristic of Sr(Ce0.6Zr0.4)0.85Y0.15O3−δ ceramic separation membrane

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