The Oxygen Permeation of Solid∕Melt Composite BiVO4 – 10 wt % V2O5 Membrane

Белоусов, В. В.; Fedorov, S. V.; Vorobiev, A.V.

doi:10.1149/1.3561425

Cited by 28 publications

(11 citation statements)

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“…6. Electrons and anions are the most mobile particles [16][17][18][19]. Relative migration rates of the electrons and ions are balanced in such a way that the total current trough the scale (the scale consists of solid oxide and liquid channels) is zero.…”

Section: Resultsmentioning

confidence: 99%

Accelerated Oxidation of V2O5-Deposited Copper

Климашин

Белоусов

2011

Oxid Met

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The accelerated-oxidation kinetics of V 2 O 5 -deposited copper were studied in the temperature range 560-800°C in air. The accelerated oxidation followed the parabolic-rate law, indicating that the process was diffusion-controlled. Oxygen diffusion along liquid channels in the oxide scale was inferred to be the rate-limiting step in the overall mechanism. The parabolic-rate constant increased from 3.4 9 10 -6 to 1.6 9 10 -5 kg 2 m -4 s -1 with increasing the deposit mass from 0.075 to 0.225 kg m -2 at 700°C.

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Section: Resultsmentioning

confidence: 99%

Accelerated Oxidation of V2O5-Deposited Copper

Климашин

Белоусов

2011

Oxid Met

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“…Both surface exchange reactions and chemical diffusion can limit the kinetics of oxygen permeation through the MOM. The oxygen permeation flux ( j O 2 ) limited by chemical diffusion is usually described by Wagner’s equation where σ amb is the ambipolar conductivity of electrons and oxygen ions and h is the thickness of membrane: where σ i and σ e are the ionic and electronic conductivities, respectively. When the permeation of oxygen through the MOM is limited by surface exchange reactions and chemical diffusion (mixed controlled kinetics), the flux can be expressed by eq where h c is the characteristic thickness of membrane at which the overall permeation control by surface exchange reactions is equal to the control by chemical diffusion.…”

Section: Molten Oxide Membranesmentioning

confidence: 99%

“…Apparently, in this case the oxygen transport is limited equally by chemical diffusion and surface exchange reactions (mixed controlled kinetics; red line in Figure ). It was established that the characteristic thickness ( h c in eq ) for the BiVO 4 –V 2 O 5 MOM is approximately equal to 0.7 mm . At a smaller thickness, the kinetics of oxygen permeation is limited by the surface exchange reactions.…”

Section: Molten Oxide Membranesmentioning

confidence: 99%

“…It was established that the characteristic thickness (h c in eq 5) for the BiVO 4 −V 2 O 5 MOM is approximately equal to 0.7 mm. 39 At a smaller thickness, the kinetics of oxygen permeation is limited by the surface exchange reactions.…”

Section: Molten Oxide Membranesmentioning

confidence: 99%

“…permeation through the MOM. The oxygen permeation flux (j O 2 ) limited by chemical diffusion is usually described by Wagner's equation39 …”

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Next-Generation Electrochemical Energy Materials for Intermediate Temperature Molten Oxide Fuel Cells and Ion Transport Molten Oxide Membranes

Белоусов

2017

Acc. Chem. Res.

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High temperature electrochemical devices such as solid oxide fuel cells (SOFCs) and oxygen separators based on ceramic materials are used for efficient energy conversion. These devices generally operate in the temperature range of 800-1000 °C. The high operating temperatures lead to accelerated degradation of the SOFC and oxygen separator materials. To solve this problem, the operating temperatures of these electrochemical devices must be lowered. However, lowering the temperature is accompanied by decreasing the ionic conductivity of fuel cell electrolyte and oxygen separator membrane. Therefore, there is a need to search for alternative electrolyte and membrane materials that have high ionic conductivity at lower temperatures. A great many opportunities exist for molten oxides as electrochemical energy materials. Because of their unique electrochemical properties, the molten oxide innovations can offer significant benefits for improving energy efficiency. In particular, the newly developed electrochemical molten oxide materials show high ionic conductivities at intermediate temperatures (600-800 °C) and could be used in molten oxide fuel cells (MOFCs) and molten oxide membranes (MOMs). The molten oxide materials containing both solid grains and liquid channels at the grain boundaries have advantages compared to the ceramic materials. For example, the molten oxide materials are ductile, which solves a problem of thermal incompatibility (difference in coefficient of thermal expansion, CTE). Besides, the outstanding oxygen selectivity of MOM materials allows us to separate ultrahigh purity oxygen from air. For their part, the MOFC electrolytes show the highest ionic conductivity at intermediate temperatures. To evaluate the potential of molten oxide materials for technological applications, the relationship between the microstructure of these materials and their transport and mechanical properties must be revealed. This Account summarizes the latest results on oxygen ion transport in potential MOM materials and MOFC electrolytes. In addition, we consider the rapid oxygen transport in a molten oxide scale formed on a metal surface during catastrophic oxidation and show that the same transport could be used beneficially in MOMs and MOFCs. A polymer model explaining the oxygen transport in molten oxides is also considered. Understanding the oxygen transport mechanisms in oxide melts is important for the development of new generation energy materials, which will contribute to more efficient operation of electrochemical devices at intermediate temperatures. Here we highlight the progress made in developing this understanding. We also show the latest advances made in search of alternative molten oxide materials having high mixed ion electronic and ionic conductivities for use in MOMs and MOFCs, respectively. Prospects for further research are presented.

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Ceramic Membranes with Mixed Ionic and Electronic Conductivity

Caro

Wei

2016

Membrane Reactor Engineering

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The Oxygen Permeation of Solid∕Melt Composite BiVO4 – 10 wt % V2O5 Membrane

Cited by 28 publications

References 18 publications

Accelerated Oxidation of V2O5-Deposited Copper

Accelerated Oxidation of V2O5-Deposited Copper

Next-Generation Electrochemical Energy Materials for Intermediate Temperature Molten Oxide Fuel Cells and Ion Transport Molten Oxide Membranes

Ceramic Membranes with Mixed Ionic and Electronic Conductivity

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