NDLI: Theoretical model for AB5 alloy hydride formation: the electrochemical activation of the hydrogen diffusion process

Content Provider	Springer Nature Link
Author	Teliz, E. Díaz, V. Zila, C. F.
Copyright Year	2015
Abstract	This paper examines the hydrogen diffusion process during activation cycles in LaNi3.6Co0.7Mn0.4 − x Mo x Al0.3 alloys with x = 0; 0.1 and 0.25 in strong alkaline solutions. The effect of molybdenum substitution was analyzed by potential, composition, and temperature (E-c-T) and charge/discharge curves. Hysteresis values and the potential between charge/discharge curves have been used as parameters for efficiency loss. Further, electrochemical impedance spectroscopy was carried out in order to visualize the charge transfer and diffusion component during activation process. A mathematical approach is presented here based on the mechanism involved in the course of the hydriding reaction solving a spherical second Fick’s law. Thus, adsorbed hydrogen is considered to be transferred from the surface to inner sites, and the diffusion into the bulk of the alloy is demonstrated to be the slow route. Diffusion overpotentials and time constants for AB5 alloys were calculated as a function of the number of hydrogenation cycles. These results show that the molybdenum content has positive effects in kinetic behavior.
Starting Page	115
Ending Page	122
Page Count	8
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	20
Issue Number	1
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Molybdenum AB5 alloys Hydrogen Diffusion Hysteresis Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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