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Titolo:
Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers
Autore:
Oren, Y; Tamir, A; Lederman, Y; Gavra, Z;
Indirizzi:
Nucl Res Ctr Negev, Dept Chem, IL-84190 Beer Sheva, Israel Nucl Res Ctr Negev Beer Sheva Israel IL-84190 L-84190 Beer Sheva, Israel Ben Gurion Univ Negev, Dept Chem Engn, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel
Titolo Testata:
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
fascicolo: 1, volume: 63, anno: 2002,
pagine: 57 - 64
SICI:
0022-3697(200201)63:1<57:DAEMFS>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
AC-IMPEDANCE; TIO2 FILM; PERMEATION; ABSORPTION; ALLOYS; DESORPTION; BILAYER; CERIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Oren, Y Nucl Res Ctr Negev, Dept Chem, POB 9001, IL-84190 Beer Sheva, Israel Nucl Res Ctr Negev POB 9001 Beer Sheva Israel IL-84190 va, Israel
Citazione:
Y. Oren et al., "Dilatometric and electrochemical measurements for studying hydrogen transport through oxide layers", J PHYS CH S, 63(1), 2002, pp. 57-64

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 acidityand 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 X 10(-11) cm(2) s(-1)D((1 N H2SO4)) = 1.72 X10(-11) cm(2) s(-1). (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 03:43:48