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Titolo:
Study of hydrogen diffusion in alpha- and beta-phase hydrides of Mg2Ni alloy by microelectrode technique
Autore:
Cui, N; Luo, JL; Chuang, KT;
Indirizzi:
Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada Univ Alberta Edmonton AB Canada T6G 2G6 ngn, Edmonton, AB T6G 2G6, Canada
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 503, anno: 2001,
pagine: 92 - 98
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEUTRON-SCATTERING; STORAGE ALLOYS; ELECTRODE; MAGNESIUM; ADDITIONS; BEHAVIOR;
Keywords:
diffusion; hydrogen storage alloy; alpha- and beta- phase hydrides; microelectrode; nickel metal hydride battery;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Luo, JL Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada Univ Alberta Edmonton AB Canada T6G 2G6 onton, AB T6G 2G6, Canada
Citazione:
N. Cui et al., "Study of hydrogen diffusion in alpha- and beta-phase hydrides of Mg2Ni alloy by microelectrode technique", J ELEC CHEM, 503(1-2), 2001, pp. 92-98

Abstract

A new microelectrode technique was developed for studying hydrogen diffusion in Mg2Ni alloy electrodes during charging and discharging in 6 M KOH solution based on a spherical core shrink model. The diffusion coefficients ofhydrogen in alpha- and beta -phase hydrides were measured on a single particle electrode using the potential-step method. It was found that the diffusion of hydrogen in the beta -phase of the hydride occurs more slowly than in the alpha -phase. This effect is attributed to formation of a beta -phase hydride layer beneath the particle surface during charging which retards hydrogen transport and results in incomplete charging. This leads to an extremely low electrochemical capacity. The diffusivity of hydrogen in magnesium alloy powders measured by the microelectrode technique was also comparedwith those evaluated by a porous plate electrode. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 13:37:29