Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers

Y. Oren; A. Tamir; Y. Lederman; Z. Gavra

doi:10.1016/S0022-3697(01)00048-8

Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers

Y. Oren, A. Tamir, Y. Lederman, Z. Gavra

Department of Chemical Engineering

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1 Scopus citations

Abstract

Simultaneous dilatometric and electrochemical measurements are employed for studying the kinetic parameters and mechanism for hydrogen transport through metal oxides. As a model, CeO₂ layer on a palladium wire substrate is investigated. Hydrogen is dissolved in aqueous solutions where their acidity and the oxide layer thickness are the studied parameters. Based on both open circuit potential and length changes, it is deduced that molecular diffusion through pores and imperfections in the ceria lattice is the rate determining step and no chemical reactions are involved in the oxide bulk. The following diffusion coefficients are calculated by using a diffusional transport model: D_{(1 N KOH)} = 1.69 × 10^-11 cm² s^-1D_{(1 N H2SO4)} = 1.72 × 10^-11 cm² s^-1.

Original language	English
Pages (from-to)	57-64
Number of pages	8
Journal	Journal of Physics and Chemistry of Solids
Volume	63
Issue number	1
DOIs	https://doi.org/10.1016/S0022-3697(01)00048-8
State	Published - 1 Jan 2001

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/S0022-3697(01)00048-8

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title = "Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers",

abstract = "Simultaneous dilatometric and electrochemical measurements are employed for studying the kinetic parameters and mechanism for hydrogen transport through metal oxides. As a model, CeO2 layer on a palladium wire substrate is investigated. Hydrogen is dissolved in aqueous solutions where their acidity and the oxide layer thickness are the studied parameters. Based on both open circuit potential and length changes, it is deduced that molecular diffusion through pores and imperfections in the ceria lattice is the rate determining step and no chemical reactions are involved in the oxide bulk. The following diffusion coefficients are calculated by using a diffusional transport model: D(1 N KOH) = 1.69 × 10-11 cm2 s-1D(1 N H2SO4) = 1.72 × 10-11 cm2 s-1.",

author = "Y. Oren and A. Tamir and Y. Lederman and Z. Gavra",

note = "Funding Information: This study was supported by the Israeli Council of High Education and the Israeli Atomic Energy Commission. The authors wish to thank Mrs. H. Sela and Dr. G. Kimel for preparing XRD samples and interprating XRD results.",

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T1 - Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers

AU - Oren, Y.

AU - Tamir, A.

AU - Lederman, Y.

AU - Gavra, Z.

N1 - Funding Information: This study was supported by the Israeli Council of High Education and the Israeli Atomic Energy Commission. The authors wish to thank Mrs. H. Sela and Dr. G. Kimel for preparing XRD samples and interprating XRD results.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Simultaneous dilatometric and electrochemical measurements are employed for studying the kinetic parameters and mechanism for hydrogen transport through metal oxides. As a model, CeO2 layer on a palladium wire substrate is investigated. Hydrogen is dissolved in aqueous solutions where their acidity and the oxide layer thickness are the studied parameters. Based on both open circuit potential and length changes, it is deduced that molecular diffusion through pores and imperfections in the ceria lattice is the rate determining step and no chemical reactions are involved in the oxide bulk. The following diffusion coefficients are calculated by using a diffusional transport model: D(1 N KOH) = 1.69 × 10-11 cm2 s-1D(1 N H2SO4) = 1.72 × 10-11 cm2 s-1.

AB - Simultaneous dilatometric and electrochemical measurements are employed for studying the kinetic parameters and mechanism for hydrogen transport through metal oxides. As a model, CeO2 layer on a palladium wire substrate is investigated. Hydrogen is dissolved in aqueous solutions where their acidity and the oxide layer thickness are the studied parameters. Based on both open circuit potential and length changes, it is deduced that molecular diffusion through pores and imperfections in the ceria lattice is the rate determining step and no chemical reactions are involved in the oxide bulk. The following diffusion coefficients are calculated by using a diffusional transport model: D(1 N KOH) = 1.69 × 10-11 cm2 s-1D(1 N H2SO4) = 1.72 × 10-11 cm2 s-1.

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JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 1

ER -

Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers

Abstract

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