Mass transport in supported zinc halide solutions—I. Effective diffusivities of zinc

Hsie, W.C.; Gopikanth, M. L.; Selman, J. R.

doi:10.1016/0013-4686(85)85017-9

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…It should be noted that the diffusion coefficients reported in this study are effective or integral values that represent averages for the composition and physical properties across the diffusion layer (27,28). The effect of migration atso is included in the effective diffusion coefficients, but is significant only at relatively high CuSO4 concentrations (greater than -0.25M).…”

Section: Effective Diffusion Coefficientsmentioning

confidence: 99%

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Diffusion Coefficients for Copper (II) in Aqueous Cupric Sulfate‐Sulfuric Acid Solutions

Hinatsu

Foulkes

1989

J. Electrochem. Soc.

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Diffusion coefficients for Cu(II), Dcu , were determined at 25~ in 0.51M H2SO4 over the concentration range 0.4 mM 1.0M CuSO4. The reported values of Dcu represent average values for the physical properties over the diffusion layer, and for the diffusing Cu(II) species, which consist of Cu ++ ions and Cu++SO4 = ion pairs. Thus, Dcu represents an effective value that is suitable for substitution into the various mass-transfer equations derived by assuming constant properties. At low CuSO4 concentrations (0.4-6 raM) static mercury drop electrode (SMDE) polarography using a modified version of the ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.83.63.20 Downloaded on 2014-06-24 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.83.63.20 Downloaded on 2014-06-24 to IP ABSTRACTAt current densities large in magnitude and also large compared to the exchange current density, a conducting disk in an insulating plane has a very nonuniform current distribution across the surface. The current distribution near the center is governed predominantly by ohmic effects, but near the edge, electrode kinetics become important. This paper describes the treatment of the current and potential distributions on the electrode, especially near the edge of the electrode where

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Section: Effective Diffusion Coefficientsmentioning

confidence: 99%

“…However, the Sand equation can be used to calculate effective diffusion coefficients, which include the effect of migration at higher CuSO, concentrations (27). However, the Sand equation can be used to calculate effective diffusion coefficients, which include the effect of migration at higher CuSO, concentrations (27).…”

Section: Hzs04 At 25~mentioning

confidence: 99%

Diffusion Coefficients for Copper (II) in Aqueous Cupric Sulfate‐Sulfuric Acid Solutions

Hinatsu

Foulkes

1989

J. Electrochem. Soc.

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“…(19,20). The extent to which these zinc species are present and influence cell performance is assumed negligible in all of the models (4, 9-14) pesented so far.…”

Section: Figurementioning

confidence: 99%

“…Lee and Selman used these analytical solutions, which are integral equations involving the current density, in their model to calculate the two-dimensional (x, y) electrolyte potential profile, the one-dimensional (x) reactant concentration profile, and the one-dimensional (x) electrode potential profile. Ohm's law for the separator is used to relate the solution potential on either border of the separator to the current density in the separator Ss . apsep,c(X) -r zsep(x) [19] Ksep Equation [11] is used to calculate electrochemical reaction rates at the electrode surfaces. A concentration overpotential term is included in Eq.…”

Section: Otmentioning

confidence: 99%

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A Review of Mathematical Modeling of the Zinc/Bromine Flow Cell and Battery

Evans

White

1987

J. Electrochem. Soc.

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Mathematical models which have been developed to study various aspects of the zinc/bromine cell and stack of cells are reviewed. Development of these macroscopic models begins with a material balance, a transport equation which includes a migration term for charged species in an electric field, and an electrode kinetic expression. Various types of models are discussed: partial differential equation models that can be used to predict current and potential distributions, an algebraic model that includes shunt currents and associated energy losses and can be used to determine the optimum resistivity of an electrolyte, and ordinary differential equation models that can be used to predict the energy efficiency of the cell as a function of the state of charge. These models have allowed researchers to better understand the physical phenomena occurring within parallel plate electrochemical flow reactors and have been instrumental in the improvement of the zinc/bromine cell design. Suggestions are made for future modeling work.

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Mass Transport in Aqueous Zinc Chloride‐Potassium Chloride Electrolytes

Leaist¹

1986

Ber Bunsenges Phys Chem

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Conductimetric and diaphragm cell techniques have been used to measure ternary diffusion coefficients for aqueous zinc chloride-potassium chloride solutions at 25°C. At low concentrations where ZnZ+ is the major zinc-transporting species, the diffusion-induced electric field along zinc chloride concentration gradients drives large co-current flows of potassium chloride. In concentrated solutions where a large proportion of zinc diffuses as anionic ZnClc and ZnC1:-complexes, flow of zinc chloride generates countefflow of potassium chloride.Ber. Bunsenges. Phys. Chem. 90, 797-802 (1986) -0 VCH Verlagsgesellschaft mbH, D-6940 Weinheim, 1986.

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Mass transport in supported zinc halide solutions—I. Effective diffusivities of zinc

Cited by 12 publications

References 9 publications

Diffusion Coefficients for Copper (II) in Aqueous Cupric Sulfate‐Sulfuric Acid Solutions

Diffusion Coefficients for Copper (II) in Aqueous Cupric Sulfate‐Sulfuric Acid Solutions

A Review of Mathematical Modeling of the Zinc/Bromine Flow Cell and Battery

Mass Transport in Aqueous Zinc Chloride‐Potassium Chloride Electrolytes

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