Chemical Structures and Performance of Perovskite Oxides

Peña, M.A.; Fierro, J.L.G.

doi:10.1021/cr980129f

Cited by 2,538 publications

(1,427 citation statements)

References 336 publications

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“…This particular response pattern to NO at high temperatures (increase in with [NO]) has been observed before for NO x monitoring studies using n-type semiconducting metal-oxides [12,[35][36][37][38]. It is noteworthy that the presence of low concentrations of nitric oxide resulted in an increase in electronic conductance (Figure 7), which is the response pattern commonly found for perovskite oxides (p-type materials) when an interaction with oxidizing gases, including molecular O 2 , takes place [39]. For instance, the sensing response to NO and NO 2 for both WO 3 and a series of tungstates (MeWO 4, were Me = Mg, Ca, Sr, Ba, Mn, Co, Zn) were investigated in the 450 -500 °C temperature range [38].…”

Section: °Csupporting

confidence: 68%

Copper tungstate thin-films for nitric oxide sensing

Gonzalez

Dunford

et al. 2012

Sensors and Actuators B: Chemical

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.snb.2012.06.067 Sensors and Actuators B: Chemical, 173, pp. 169-176, 2012-07-08 Copper tungstate thin-films for nitric oxide sensing Gonzalez, C. M.; Du, X.; Dunford, J. L.; Post, M. L.

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Section: °Csupporting

confidence: 68%

Copper tungstate thin-films for nitric oxide sensing

Gonzalez

Dunford

et al. 2012

Sensors and Actuators B: Chemical

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“…KNbO 3 is a ferroelectric material that is commonly used as a photocatalyst because it is nontoxic, cost‐effective, and highly stable under light illumination 161. Zhang et al162 performed an in‐depth study on the relationships between the structure and photoreactivity of ferroelectric KNbO 3 NWs and their respective orthorhombic and monoclinic polymorphs.…”

Section: Properties and Applicationsmentioning

confidence: 99%

One‐Dimensional Ferroelectric Nanostructures: Synthesis, Properties, and Applications

et al. 2016

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One‐dimensional (1D) ferroelectric nanostructures, such as nanowires, nanorods, nanotubes, nanobelts, and nanofibers, have been studied with increasing intensity in recent years. Because of their excellent ferroelectric, ferroelastic, pyroelectric, piezoelectric, inverse piezoelectric, ferroelectric‐photovoltaic (FE‐PV), and other unique physical properties, 1D ferroelectric nanostructures have been widely used in energy‐harvesting devices, nonvolatile random access memory applications, nanoelectromechanical systems, advanced sensors, FE‐PV devices, and photocatalysis mechanisms. This review summarizes the current state of 1D ferroelectric nanostructures and provides an overview of the synthesis methods, properties, and practical applications of 1D nanostructures. Finally, the prospects for future investigations are outlined.

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“…Estes sólidos possuem a fórmula ABO 3 , em que A é o cátion de tamanho maior, responsável pela resistência térmica do catalisador, enquanto B é o cátion associado com a atividade catalítica. Por apresentarem, ainda, a possibilidade da substituição parcial dos cátions A e/ou B por outro cátion metálico (permitindo o controle da atividade e da estabilidade térmica), eles são capazes de dar origem a uma vasta família de compostos com fórmula geral A 1-x A' x B 1-x B' x O 3 (em que x é o grau de substituição parcial) [13][14][15][16]. O uso desses materiais, como catalisadores, deve-se principalmente ao fato deles possuírem oxigênio com alta mobilidade e apresentarem elevada estabilidade estrutural.…”

Section: Introductionunclassified

Síntese e caracterização de perovskitas do tipo LaNi1-xCu xO3 para a purificação de hidrogênio para PaCOS

Moura¹,

Silva²,

Rangel³

et al. 2010

Matéria (Rio J.)

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RESUMONeste trabalho, foram estudados sólidos do tipo LaNi1-xCuxO3 (x = 0,0; 0,3 e 0,5), com estrutura perovskita, visando a desenvolver catalisadores destinados à produção de hidrogênio de alta pureza na reforma interna de células a combustível de óxido sólido (SOFC). Observou-se que as condições experimentais usadas na preparação favoreceram a incorporação quantitativa dos cátions ao precursor e a formação dos sólidos com estrutura perovskita. Esses materiais mostraram diferentes propriedades redutoras e a presença do cobre favoreceu a estabilidade da estrutura perovskita. As propriedades catalíticas das amostras obtidas foram avaliadas na reação de deslocamento de monóxido de carbono com vapor d`água (WGSR, water gas shift reaction), uma etapa importante de purificação do hidrogênio, no processo de reforma de hidrocarbonetos. Os resultados mostraram que os catalisadores são promissores para esta reação, apresentando atividade muito superior à de um catalisador comercial de óxido de ferro contendo cromo e cobre; isto foi atribuído à tendência das amostras em favorecer o mecanismo adsortivo, provavelmente decorrente de uma alta mobilidade dos oxigênios da rede cristalina. O valor mais elevado de atividade catalítica foi apresentado pela Amostra LaNi0,5Cu0,5O3, considerada o catalisador de melhor desempenho.Palavras-chave: Perovskita, produção de hidrogênio, conversão de CO, níquel e cobre. ABSTRACTLaNi 1-x Cu x O 3 (x = 0.0, 0.3 and 0.5) type solids with perovskite structure were studied in this work aiming to develop catalysts for the production of high pure hydrogen in the internal reforming of solid oxide fuel cells (SOFC). It was observed that the experimental conditions used for preparing the samples favored the quantitative incorporation of cations in the precursor and the formation of solids with perovskite structure. These materials showed different reducing properties and the copper presence favored the stability of the perovskite structure. The catalytic properties of the samples were evaluated in water gas shift reaction (WGSR), an important step for purifying hydrogen in the process of hydrocarbons reforming. The results showed that the catalysts are promising for the reaction, showing much higher activities than a iron oxidebased commercial catalyst containing chromium and copper; This was assigned to the tendency of the samples in favoring the adsorptive mechanism, probably due to a high mobility of oxygen in the crystalline lattice. The highest value of catalytic activity was shown by the LaNi 0.5 Cu 0.5 O 3 sample, the catalyst with the best performance.

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Chemical Structures and Performance of Perovskite Oxides

Cited by 2,538 publications

References 336 publications

Copper tungstate thin-films for nitric oxide sensing

Copper tungstate thin-films for nitric oxide sensing

One‐Dimensional Ferroelectric Nanostructures: Synthesis, Properties, and Applications

Síntese e caracterização de perovskitas do tipo LaNi1-xCu xO3 para a purificação de hidrogênio para PaCOS

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