Effects of mechanical grinding on the hydrogen storage and electrochemical properties of LaNi5

Corre, Stéphanie; Bououdina, M.; Kuriyama, Nobuhiro; Fruchart, D.; Adachi, Gin‐ya

doi:10.1016/s0925-8388(99)00084-5

Cited by 34 publications

(27 citation statements)

References 24 publications

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“…When milling is performed under an inert atmosphere, hydrogen can be readily absorbed if the milled powder is not exposed to the air [151]. Compared to the unmilled alloy, ball-milled LaNi 5 is easier to activate and has faster first hydrogenation kinetics [152]. Moreover, because of the large difference in melting point between La and Ni, mechanical alloying could be a good method for the synthesis of LaNi 5 compounds [153].…”

Section: Abmentioning

confidence: 99%

“…The plateau pressure increases for nanocrystalline materials with a reduction in hydrogen capacity and a sloping plateau [152,154,155]. In reference [154] a high energy shaker mill (SPEX 8000) was used, while for references [152,155] milling was performed on a Fritsch P7 planetary mill.…”

Section: Abmentioning

confidence: 99%

“…In reference [154] a high energy shaker mill (SPEX 8000) was used, while for references [152,155] milling was performed on a Fritsch P7 planetary mill. However, because of batch sizes, grinding balls and milling speed, the milling in [155] was more energetic than in [152]. This explains why in [155] the loss of capacity is more important and the plateau slope is greater than in [152].…”

Section: Abmentioning

confidence: 99%

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Metal Hydrides

Huot

2010

Handbook of Hydrogen Storage

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Metal hydrides are promising candidates for many stationary and mobile hydrogen storage applications. Presently, the most common use of metal hydrides is as anode material in commercial nickel-metal hydrides (Ni-MH) rechargeable batteries which have replaced conventional nickel-cadmium batteries in many applications. A wide variety of Ni-MH batteries are now on the market with cell sizes ranging from 30 mAh to 250 Ah [1,2]. Some other applications are: hydrogen compression [3], aircraft fire-detectors [4], isotope separation [5], and hydrogen getters for microelectronic packages. Hydride formation is also used in the HDDR process (hydrogenation-disproportionation-desorption-recombination) for the synthesis of magnetic materials such as Nd 2 Fe 14 B [6]. A striking application is as a component of cryocoolers for the ESA Planck mission [7]. Another exciting new application is the use of metal hydrides for switchable mirrors [8]. As we can see, metal hydrides have a wide range of applications. However, most research and development is targeted towards two applications: batteries and hydrogen storage. The former is now widely exploited but the latter is still facing many technical problems. The main advantages of storing hydrogen in a metal hydride are the high hydrogen volumetric densities (sometimes higher than in liquid hydrogen) and the possibility to absorb and desorb hydrogen with a small change in hydrogen pressure [9].The physics of hydrogen in elemental metals was reviewed at the end of the 1970s in thebooksHydrogeninMetals,volumesIandII [10,11].The1970s alsosawtheemergence of the important field of intermetallic compounds as hydride materials. An in-depth review of this field can be found in Hydrogen in Intermetallic Compounds volumes I, and II [12,13]. A review of the propertiesand applications of hydrogen in metals can befound in the third volume of Hydrogen in Metals [14]. The basic properties of the metal-hydrogen system are discussed from a fundamental point of view by Fukai [15]. Although initial studies on nanocrystalline and amorphous metal hydrides were initiated around the 1980s [16], the real emergence of nanocrystalline metal hydrides as a new class of Handbook of Hydrogen Storage. Edited by Michael Hirscher

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Section: Abmentioning

confidence: 99%

Section: Abmentioning

confidence: 99%

Section: Abmentioning

confidence: 99%

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Metal Hydrides

Huot

2010

Handbook of Hydrogen Storage

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“…At the same time, the product can be produced easily by ball milling. [51,52] A material synthesized in such a manner exhibits improved hydrogenation and dehydrogenation kinetics, [53] see Figure 8. It was also shown that a nanocomposite produced by ball milling of the immiscible metals Fe and Mg exhibits better hydrogenation kinetics and reversible capacities for hydrogen than the same material produced by sintering.…”

Section: Nanocompositesmentioning

confidence: 99%

Nanotechnological Aspects in Materials for Hydrogen Storage

Fichtner¹

2005

Adv Eng Mater

231

162

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A nanotechnological app#roach aims at making tailor‐made developments for storage materials by combining different scientific disciplines and focussing on processes on the microscale. The approach has already been successful in achieving major advances in the field of novel solid materials for hydrogen storage. However, further breakthroughs are necessary to reach the goal of storage systems for fuel cell‐driven, mobile applications.

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“…[1] Assuming half of this mass is to be stored daily before use, with the currently achievable 5 wt % capacity, the total hydrogen storage materials (HSMs) will amount tõ 8 10 10 kg, which can be compared with the worlds annual production of~8 10 11 kg steel, which is the most produced material. Such a huge demand would make many currently favoured high performance HSMs, such as LaNi 5 H x , [7] ZrV 2 H x [8] and their derivatives, impractical for large-scale applications in terms of resource and commercial realities, and hence encourages an urgent reconsideration of the cheap and abundant alternatives.…”

Section: Introductionmentioning

confidence: 99%

A Direct Electrochemical Route from Ilmenite to Hydrogen‐Storage Ferrotitanium Alloys

Wang

et al. 2006

Chemistry A European J

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An unrecognised but predictable need for a hydrogen-supported society is tens or even hundreds of million tonnes of hydrogen-storage materials, and thus challenges existing technologies in terms of resource and economical realities. Ilmenite is an abundant mineral, and ferrotitanium alloys are among the earliest known hydrogen-storage materials. At present, industrial production of ferrotitanium alloys goes through separate extraction of individual metals, followed by a multistep arc-melting process. In particular, the extraction of titanium from ilmenite is highly energy intensive and tedious, accounting for titanium's high market price and restricted uses. This article reports the electrochemical synthesis of various ferrotitanium alloy powders directly from solid ilmenite in molten calcium chloride. More importantly, it demonstrates, for the first time, that such produced alloy powders can be used without further treatment for hydrogen storage and perform comparably with or better than similar products by means of other methods, but cost just a fraction.

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Effects of mechanical grinding on the hydrogen storage and electrochemical properties of LaNi5

Cited by 34 publications

References 24 publications

Metal Hydrides

Metal Hydrides

Nanotechnological Aspects in Materials for Hydrogen Storage

A Direct Electrochemical Route from Ilmenite to Hydrogen‐Storage Ferrotitanium Alloys

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