scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Effect of substitutional elements on hydrogen absorption properties in Mm-based AB5 alloys

28 Jan 2004-Journal of Alloys and Compounds (Elsevier)-Vol. 363, Iss: 1, pp 275-291
TL;DR: In this paper, the authors studied the hydrogen absorption isotherms for the CaCu5 hexagonal structured alloys MmNi3.4, Mm Ni3.8Al 0.368Mn0.5Fe0.4Co 0.333V0.333Al0.3Fe0,4Fe 0.5Co 0,5Fe 0,6Al 0,7Al 0 0,8Al0 0.4Fe0 0,4Co0.
About: This article is published in Journal of Alloys and Compounds.The article was published on 2004-01-28. It has received 48 citations till now. The article focuses on the topics: Hydrogen & Hydrogen storage.
Citations
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors explored the technical issues surrounding the use of hydrogen storage, in conjunction with a PEM electrolyser and PEM fuel cell, to guarantee electricity supply when the energy source is intermittent, most typically solar photovoltaic.

131 citations

Journal ArticleDOI
TL;DR: In this paper, the role of Mn in C14 Laves phase alloys for battery applications was studied by adjusting the Mn content in exchange with Ni and Cr in three series of C14 AB2 Laves Phase alloys.

64 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of aluminum substitution to the structural, electrochemical, and gas phase hydrogen storage properties of C14-rich alloys were reported, including minor phases including C15 and TiNi, identified by X-ray diffraction analysis.

50 citations

Journal ArticleDOI
TL;DR: In this article, the performance of metal hydride based cooling system (MHCS) is evaluated by characterizing intermetallic hydrides to determine their suitability in MHCS, and the effect of compositional changes on the variation of these parameters due to the variation in pressure concentration isotherm properties (storage capacity, plateau slope, hysteresis effect, etc.) was studied.

48 citations

Journal ArticleDOI
TL;DR: In this article, a novel AB5-type, non-stoichiometric, lanthanum-rich MmNi3.03Si0.85Co0.60Mn0.31Al0.08 (Mm: Misch metal) hydrogen storage metal hydride alloy electrodes are prepared.

46 citations

References
More filters
Journal ArticleDOI
TL;DR: In this article, it was shown that hydrogen absorption does not change the structure of these compounds but merely causes an expansion of the lattice, which is attributed to the change in easy direction of magnetization.

28 citations

Journal ArticleDOI
TL;DR: In this paper, high-resolution quasi-elastic neutron scattering has been used to study the hydrogen diffusion in the multi-component Laves phase hydride Ti0.8Zr0.2CrMnH3, one of the most promising hydrogen storage materials for technical applications.
Abstract: High-resolution quasi-elastic neutron scattering has been used to study the hydrogen diffusion in the multi-component Laves phase hydride Ti0.8Zr0.2CrMnH3, one of the most promising hydrogen storage materials for technical applications. The data analysis is complicated by multiple scattering which, even with only moderately scattering samples, leads to a fictitious line broadening at small momentum transfers and considerably hinders the determination of diffusion coefficients. An evaluation procedure is presented which allows for the necessary multiple scattering corrections independent of details of the single diffusive steps. In the temperature range of the study, 230-360K, the hydrogen self-diffusion coefficient in Ti0.8Zr0.2CrMnH3 obeys the Arrhenius law: D=(3+or-1)*10-4 cm2 s-1 exp(-(220+or-20) meV/kBI). This comparatively fast hydrogen diffusion is not the rate determining step in the absorption and desorption kinetics.

25 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compared the absorption and desorption kinetics of a series of LaNi4.5T0.5 hydrides (T=Fe, Co or Cu) under essentially isothermal and isobaric conditions.
Abstract: A study was done to compare the absorption and desorption kinetics of a series of LaNi4.5T0.5 hydrides (T=Fe, Co or Cu) with those of LaNi5−H. Measurements were done under essentially isothermal and isobaric conditions. Experiments were also designed so that the ratio of the equilibrium plateau pressure to the opposing pressure was the same in all cases. It was found that, under identical reaction conditions, partial substitution of the lanthanum in LaNi5 with copper, cobalt or iron generally decreases desorption rates. Among the LaNi4.5T0.5 hydrides desorption rates decreased in the following order: T=Ni>Cu>Co>Fe. Since this is the same order as the plateau pressures in these materials, it appears that in alloys having similar crystallographic and electronic properties, the reaction rate is inversely proportional to hydride stability. The absorption experiments differed in that LaNi5 absorbed hydrogen slower than any of the ternary alloys. This anomalous behavior indicates that absorption proceeds by a different mechanism than does desorption and that the presence of copper, cobalt or iron may be altering the rate-limiting process.

24 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the hydrogen absorption pressure-composition isotherms for the ZrMnFe1−xNix (x=0.2, 0.4,0.5 and 0.6) alloys having the C14 type hexagonal structure in the temperature and pressure ranges 30≤T≤100°C and using a pressure reduction method.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the free energy loss per hysteresis cycle has been obtained from the pressure-composition (PC) isotherms of MmNi 5 − x Al x (x = 0.4 and 0.8).

20 citations