Structure and conductivity of Cu and Ni-substituted Bi4V2O11 compounds

Pernot, Etienne; Anne, M.; Bacmann, M.; Strobel, Pierre; Fouletier, J.; Vannier, Rose‐Noëlle; Mairesse, G.; Abraham, Francis; Nowogrocki, G.

doi:10.1016/0167-2738(94)90320-4

Cited by 96 publications

(57 citation statements)

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“…The parent compound, Bi 4 V 2 O 11 , exhibits three structurally distinct phases, α, β and γ; the three phases differ by the manner in which the oxygen vacancies order with decreasing temperature (5). The high-temperature, tetragonal γ polymorph is the best solid electrolyte, and can be stabilised down to room temperature by doping with copper, resulting in unusually high ionic conductivity between 500 and 800 K (1,2,4). Solid solution formation in the Bi 2 V 1-x Cu x O 5.5-δ series has been reported for a composition range of 0.07 ≤ x ≤ 0.12, with little change in transport properties throughout this range (1).…”

Section: Introductionmentioning

confidence: 99%

“…The difference in conductivity between compositions is probably caused both by second-phase formation and a lower oxygen-vacancy concentration when Pr 4+ cations are incorporated into the bismuth sublattice. The activation energy for electrical conductivity (E a ) was calculated using the standard Arrhenius model: [1] where A 0 is the pre-exponential factor. Parameters for the regression model, described by Eq.…”

Section: Bmarquesmentioning

confidence: 99%

“…Oxide compounds derived from Bi 4 V 2 O 11 by partial substitution of vanadium with copper, commonly referred to as BICUVOX, possess high oxygen ionic conductivity at moderate temperatures (1)(2)(3)(4)(5)(6). These materials are, therefore, of interest for numerous electrochemical applications, such as oxygen generators, sensors and oxygen-separation membranes (3,7,8).…”

Section: Introductionmentioning

confidence: 99%

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Propiedades de transporte de cerámicas Bicuvox dopadas

Yaremchenko¹,

Хартон²,

Mather³

et al. 1999

Bol. Soc. Esp. Ceram. Vidr.

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.5-δ a temperaturas superiores a 500K es ligeramente menor que la correspondiente a BICUVOX.10 no dopada, pero las propiedades de transporte en el rango de temperaturas 370-450K son similares. Dopando BICUVOX.10 con praseodimio produce la formaci-n de fases secundarias y la reducci-n de la conductividad y la expansi-n tŽrmica de las muestras cer ‡micas. El noemero de transporte del i-n sin ox'geno de fases con un contenido en tierra rara moderado como dopante (x ≤ 0.10) varia en el rango 0.90-0.99 a 780-910k y disminuye con el aumento de la temperatura. Los coeficientes de expansi-n tŽrmicos calculados a partir de los datos dilatomŽtricos para cer ‡micas

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Section: Introductionmentioning

confidence: 99%

Section: Bmarquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Propiedades de transporte de cerámicas Bicuvox dopadas

Yaremchenko¹,

Хартон²,

Mather³

et al. 1999

Bol. Soc. Esp. Ceram. Vidr.

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“…The two characteristic endothermic peaks clearly seen for the parent compound, Bi 4 V 2 O 11 (x=0) as well as the substituted photocatalyst with composition, x=0.05 are attributed to the consequent α→β and and β→γ transitions [23][24][25]. In addition, the heat flow per unit mass of the α→β transition is found to be nearly three orders of magnitude higher than that of the β→γ transition.…”

Section: Structural and Polymorphic Properties Of Photocatalystmentioning

confidence: 79%

“…The absorption edges of the BIMNVOX.x photocatalysts are found to shift toward longer wavelengths as the concentration of Mn dopant increases. This is without a doubt attributed to the additional contribution of Mn3d orbitals to the conduction band [16] and increasing oxygen vacancy concentration [24,27] in the perovskite vanadate layers. The variation of the optical bandgap energy of the BIMNVOX.x catalyst with Mn dopant concentration is illustrated in Table 2.…”

Section: Structural and Polymorphic Properties Of Photocatalystmentioning

confidence: 99%

A Novel Visible– Light Driven Photocatalyst: Ethylene Glycol–Citrate Sol–Gel Synthesis, Microwave–Assisted Calcination, and Photocatalytic Efficiency

Alarique¹

2014

AJPC

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Abstract:A novel visible-light driven photocatalyst, BIMNVOX.x was synthesized by ethylene glycol-citrate sol-gel route and microwave-assisted calcination. The phocatalyst was characterized structurally by X-ray powder diffraction (XRPD) and simultaneous thermogravimetric-differential thermal analysis (TG-DTA). Its optical and surface properties were determined by means of UV-vis absorption spectrophotometry and BET-nitrogen adsorption isotherm measurements, respectively. The photocatalytic efficiency of BIMNVOX.x system was investigated by applying the pseudo first-order kinetic model to the photocatalytic degradation reaction of crystal violet, CV dye in aqueous solution under visible light irradiation. The β (orthorhombic) -BIMNVOX phase, space group Acam exhibited the highest photocatalytic degradability, indicating that the photocatalytic efficiency of BIMNVOX catalyst is essentially enhanced by the increased number of catalyst active sites, irrespective of the kind of phase stabilized and the increasing photoabsorption ability with Mn dopant content. Moreover, the possible photocatalytic degradation mechanism of aqueous CV dye solution under visible light irradiation was also proposed.

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Advanced Inorganic Materials for Solid Oxide Fuel Cells

Skinner¹,

Laguna‐Bercero²

2011

Energy Materials

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PC-SOFC -Proton conducting solid oxide fuel cell IT-SOFC -Intermediate temperature solid oxide fuel cell IntroductionFuel cells are widely regarded as a next generation technology that will contribute to reductions in emissions of gases responsible for climate change such as CO 2 . There are several modifications to the basic concept of a fuel cell that allow operation over a wide variety of temperatures and with differing fuels. One of the most promising types of fuel cell for large scale power generation and combined heat and power applications is the solid oxide fuel cell (SOFC). The solid oxide fuel cell offers many advantages over conventional combustion-based power generation technologies and has been the subject of intensive investigation for many years. As with all other fuel cells the SOFC is an electrochemical energy conversion device that converts the chemical energy contained within a fuel (for example, H 2 ) to useful electrical energy through an electrochemical oxidation process. Using the simplest fuel as an example the overall chemical reaction occurring is: To achieve this overall reaction it is essential that we consider the basic components of the fuel cell. A SOFC consists of three ceramic functional components (anode "fuel side", cathode "air side" and electrolyte) plus an electrical interconnect that is either ceramic or metallic depending upon the operating environment. These 4 components are referred to as the fuel cell and to achieve suitable power outputs these individual cells are connected to form a fuel cell stack. Schematics of two alternative designs of a single fuel cell are shown in Figure 1.At the anode the fuel is oxidised with the oxidant (oxygen) reduced at the cathode.These two components are separated by a gas tight electrolyte membrane that is a pure ionic conductor, transporting the oxide ion species from the cathode to the fuel side. This process releases electrons to an external circuit, providing the useful electrical power. These reactions are summarised as:cathode reaction Evidently these electrode reactions are significantly more complex than shown in equations 1.1. and 1.2 and fuller discussions of the proposed fuel oxidation and oxygen reduction electrode reactions are given in [1][2][3][4].It is therefore clear that in a solid oxide fuel cell there are many processes that require optimised materials, and consequently the SOFC is a complex solid state device. As a summary, it is essential that the electrolyte is a gas tight, pure ionic conductor stable over a wide pO 2 range (>10 -24 atm). Anodes have to possess stability in reducing conditions with both high ionic and electronic conductivity, and chemical compatibility with the electrolyte material. Similar properties are required for the cathode with the exception that stability is now in oxidising environments.Additionally the cathode has to be catalytically active towards oxygen reduction, which is often a rate limiting process, particularly at lower temperatures of operation (<650 o C). These are demanding pr...

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Structure and conductivity of Cu and Ni-substituted Bi4V2O11 compounds

Cited by 96 publications

References 2 publications

Propiedades de transporte de cerámicas Bicuvox dopadas

Propiedades de transporte de cerámicas Bicuvox dopadas

A Novel Visible– Light Driven Photocatalyst: Ethylene Glycol–Citrate Sol–Gel Synthesis, Microwave–Assisted Calcination, and Photocatalytic Efficiency

Advanced Inorganic Materials for Solid Oxide Fuel Cells

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