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Determination of the diffusion coefficient and phase-transfer rate parameter in LaNi5 and MmNi3.6Co0.8Mn0.4Al0.3 using microelectrodes
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Tillämpad elektrokemi)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Tillämpad elektrokemi)ORCID iD: 0000-0001-9203-9313
1998 (English)In: Journal of the Electrochemical Society, Vol. 145, no 11, 3740-3746 p.Article in journal (Refereed) Published
Abstract [en]

A potential-step method for determining the diffusion coefficient and phase-transfer parameter in metal hydrides by using microelectrodes was investigated. It was shown that a large potential step is not enough to ensure a completely diffusion-limited mass transfer if a surface-phase transfer reaction takes place at a finite rate. It was shown, using a kinetic expression for the surface phase-transfer reaction, that the slope of the logarithm of the current vs. time curve will be constant both in the case of the mass-transfer limited by diffusion or by diffusion and a surface-phase transfer The diffusion coefficient and phase-transfer rate parameter were accurately determined for MmNi2.4Co0.8Mn0.4Al0.3 using a fit to the whole transient. The diffusion coefficient was found to be (1.3 ± 0.3) × 10-13 m2/s. The fit was good and showed that a pure diffusion model was not enough to explain the observed transient. The diffusion coefficient and phase-transfer rate parameter were also estimated for pure LaNi5. A fit of the whole curve showed that neither a pure diffusion model nor a model including phase transfer could explain the whole transient.

Place, publisher, year, edition, pages
1998. Vol. 145, no 11, 3740-3746 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-80620OAI: oai:DiVA.org:kth-80620DiVA: diva2:496820
Note
Source: Scopus NR 20140805Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2012-02-10Bibliographically approved

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Lindbergh, Göran

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