Effect of substitutional elements on hydrogen absorption properties in Mm-based AB5 alloys
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.
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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
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
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
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
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
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TL;DR: In this article, the hydrogen absorption isotherms have been obtained for the C14-type hexagonal-structured alloys ZrMnFe1-xCox (x = 0.2, 0.4,0.5 and 0.6) in the temperature and pressure ranges 30-50 °C on the hydrogen concentration.
Abstract: Hydrogen absorption isotherms have been obtained for the C14-type hexagonal-structured alloys ZrMnFe1-xCox (x = 0.2, 0.4, 0.5 and 0.6) in the temperature and pressure ranges 30≤T/ °C≤100 and 0.1≤P/bar≤40 using a high-pressure unit based on the pressure reduction method. The powder x-ray diffractograms show that the lattice constants and the unit-cell volume for ZrMnFe1-xCox (x = 0.2, 0.4, 0.5 and 0.6) alloys decrease with increase of xCo. The hydrogen absorption isotherms show the presence of a single plateau region (α + β) in the temperature and pressure ranges studied and it is found that the plateau pressure and plateau slope at any given temperature increase with increase of the xCo-content, except in the case of ZrMnFe0.5Co0.5 wherein the hydrogen absorption plateau slope is found to be smaller due to the ordering of the alloy. The dependence of the thermodynamics of the dissolved hydrogen in ZrMnFe1-xCox-H (x = 0.2, 0.4, 0.5 and 0.6) systems in the temperature range 30-50 °C on the hydrogen concentration shows the different phase regions (α, α + β, β) seen in the hydrogen absorption isotherms. The powder x-ray diffractograms of the hydrides of ZrMnFe0.8Co0.2 show that the formation of different phases is manifested in the isotherms without there being any structural change and the inclusion of hydrogen in the interstitial sites expands the unit-cell volume by about 21. Comparison of the hydrogen absorption kinetics of ZrMnFe1-xCox with that of the corresponding Ni alloys in similar experimental conditions shows that the kinetics is slow in the ZrMnFe1-xCox alloys.
13 citations
TL;DR: The thermodynamics of hydrogen solubility in MmNi 5 by replacing nickel with aluminium, manganese and tin has been studied using pressure-composition-temperature isotherms at 273, 278, 288, 298, 308, 308 and 318 K.
13 citations
TL;DR: The magnetivation behavior of the MmNi5 − vAlv system (v = 0, 06, 08 and 10; Mm misch metal) has been studied to evplore the possible electronic interactions that occur during the alloying and hydriding processes as mentioned in this paper.
Abstract: The magnetivation behaviour of the MmNi5 − vAlv system (v = 0, 06, 08 and 10; Mm misch metal) has been studied to evplore the possible electronic interactions that occur during the alloying and hydriding processes It is shown that aluminium substitution decreases the magnetivation systematically owing to the 3d band filling of nickel A steep rise in magnetivation has been observed in the intermetallics during hydrogen absorption and/or desorption Nickel precipitation seems to be responsible for this interesting characteristic
13 citations
TL;DR: In this article, the authors studied the hydrogen absorption in PuNi 3 type rhombohedral Tb 1− x Zr x Fe 3 (x =01, 02, 03) system in the temperature range 75≤ T (°C)≤150 at an initial pressure of 20 bar by fitting the experimental kinetic data to a second order rate equation.
12 citations
TL;DR: In this paper, the authors discuss the effects of different types of noise on the performance of the game and propose a new game called MmNiNi4.5H6.5Mn.
Abstract: ミッシュメタル(Mm)-ニヅケルーマンガン系合金MmNi6弼Mn.の水紫吸蔵,放出特性について検討した。MmNi5耀Mn.(劣=0.25～1.0)は室温においてすみやかに水素を吸蔵して水素化物を生成した。これらの水累化物の解離圧はニッケルと慨換するマンガン量娩こよって決まり,解離圧の値はマンガン量に比例して低くなる傾向を認めた。MmNi4.5Mn。.5は室温において水繁を吸蔵してMmMMM。.5H6.6(水素含有量1。5wt%)の水素化物を生成した。解離等温線から求めた水素化物のエンタルピー変化は-4。2kcal/m。1H2であり,解離圧は30℃において3atmであった。MmNi4。5Mn。.5の水棄吸蔵,放出速度はLaNi5およびMmNi6にくらべて大きく,室温付近における水素放出率は約97%で,放出における見かけの活性化エネルギーは5.6～6.9kca1!m。IH2であった。合金の水素吸蔵-放出のくり返しによる性能劣化は30回まで認められなかった。この合金はMm,Ni5の水素貯蔵特性を改善し,水素貯蔵用材料として適した特性を有している。
11 citations