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Hydrogen sorption properties of V85Ni15
International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2018-01-06 , DOI: 10.1016/j.ijhydene.2017.12.123
S. Tosti , A. Santucci , A. Pietropaolo , S. Brutti , O. Palumbo , F. Trequattrini , A. Paolone

An alloy with nominal composition V85Ni15 was prepared in a vacuum induction melting apparatus. The chemical analysis of the sample showed a V (Ni) content of 82.63 (15.68) at% and small contaminations by carbon and aluminum. XRD measurements confirmed that the bcc Ni-V solid solution phase is the main constituent of the sample. However, a minor impurity (approximately 6.5 wt%) due to the precipitation of the sigma NiV3-x phase is present in the sample.

Hydrogen sorption measurements extending from 150 °C up to 400 °C in a wide pressure range (up to 90 bar) were performed. Upon hydrogenation below 250 °C, one observes the subsequent presence of an α phase and of two hydride phases with different values of dehydrogenation enthalpy: ΔHdehydr = 21 ± 1 kJ/mol for 0.15 ≤ H/M ≤ 0.30 and ΔHdehydr = 26 ± 2 kJ/mol for 0.53 ≤ H/M ≤ 0.59. Above 300 °C, there is no evidence of the formation of hydrides and only an α phase is present up to the maximum measured composition, with a hydrogenation enthalpy ΔHhydr = 10.0 ± 0.5 kJ/mol.



中文翻译:

V 85 Ni 15的氢吸附性能

在真空感应熔化设备中制备具有标称组成V 85 Ni 15的合金。样品的化学分析显示,V(Ni)含量为82.63(15.68)at%,并且碳和铝的污染较小。XRD测量证实bcc Ni-V固溶相是样品的主要成分。但是,样品中由于σNiV 3-x相的析出而存在少量杂质(约6.5 wt%)。

在宽压力范围(最高90 bar)内进行了从150°C到400°C的氢吸附测量。在低于250°C的温度下氢化时,人们观察到随后出现的α相和两个氢化物相具有不同的脱氢焓:ΔH脱水 = 21±1 kJ / mol(0.15≤H / M≤0.30和ΔH脱水 = 26)对于0.53≤H / M≤0.59,±2 kJ / mol。高于300°C,没有证据表明存在氢化物形成,直到最大测得的组成,只有一个α相存在,氢化焓ΔHhydr  = 10.0±0.5 kJ / mol。

更新日期:2018-01-06
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