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1.
《International Journal of Hydrogen Energy》2020,45(8):5367-5374
High-entropy alloys (HEAs), as a new class of metallic materials, have received more and more attention due to its excellent mechanical properties. In this study, the hydrogen absorption properties, such as hydrogen absorption capacity, thermodynamics, kinetics and cyclic properties, as well as the hydride structure of a newly designed TiZrNbTa HEA were investigated. The results showed that multiple hydrides including ε-ZrH2, ε-TiH2 and β-(Nb,Ta)H were found in the TiZrNbTa HEA after hydrogenation. With the increase of temperature from 293 K to 493 K, the maximum hydrogen absorption capacity decreased from 1.67 wt% to 1.25 wt% and the plateau pressure related with β-(Nb,Ta)H hydrides increased from 1.6 kPa to 14.8 kPa. The formation enthalpy of β-(Nb,Ta)H hydride was determined to be −6.4 kJ/mol, which was less stable than that of NbH and TaH hydrides. The results also showed that the TiZrNbTa HEA exhibited a rapid hydrogen absorption kinetic even at the room temperature with a short incubation time, and the hydrogen absorption mechanism was determined to be the nucleation and growth mechanism. Moreover, the hydrogen absorption capacity at 293 K decreased slowly with the cycle numbers, and remained 86% capacity after 10 cycles. Cracking occurred after hydrogen absorption and became worse with cycles. 相似文献
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非化学计量LaNi5型储氢合金的性能 总被引:3,自引:0,他引:3
采用富La混合稀土与Ni、Co、Mg等元素组合,获得了一种非化学计量LaNi5型储氢合金、用金相、XRD和SEM-EDX等方法分析了该合金的组织结构,研究了合金的气相储氢特性以及电化学性能,结果表明:在1.6MPa氢压和温度29℃下,该合金的储氢量达到1.58%(质量分数),该合金的放电容量为380mAh/g。经300次循环后容量保持率为55%,该合金的基体是CaCu5型结构的LaNi5相,但有第二相(LaMg)Ni3析出,这种第二相的形成是导致该合金大容量的关键。 相似文献
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We investigate the thermodynamics, kinetics, and capacity of the hydrogen storage reaction: Li2Mg(NH)2 + 2H2 Mg(NH2)2 + 2LiH. Starting with LiNH2 and MgH2, two distinct procedures have been previously proposed for activating samples to induce the reversible storage reaction. We clarify here the impact of these two activation procedures on the resulting capacity for the Li–Mg–N–H reaction. Additionally, we measure the temperature-dependent kinetic absorption data for this hydrogen storage system. Finally, our experiments confirm the previously reported formation enthalpy (ΔH), hydrogen capacity, and pressure–composition–isotherm (PCI) data, and suggest that this system represents a kinetically (but not thermodynamically) limited system for vehicular on-board storage applications. 相似文献
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Modern information technologies and in particular the internet have revolutionized the patent information professionals' work in terms of speed of access and information comprehensiveness from both company internal and external digital sources. Here, I describe how the digital mindmapping technique can be used to complement existing intellectual property management software solutions to meet the challenge of optimizing and managing patent search workflows as well as to rapidly organise and access highly dynamic, heterogeneous and scattered patent information sources. Both eye catching and highly memorable and at the same time self-explanatory mindmapping examples are presented. These were designed to include basic and advanced level digital mindmapping features tailored to significantly speed up and maintain a high work quality level of patent search professionals. A special emphasis is put on the great benefit of organising and accessing the plethora of internet-based worldwide online patent registers through mindmapping, both in terms of managing the constantly changing deep links to the actual search options for e.g., legal status information, and keeping track of the offered level of content. 相似文献
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采用扩散烧结的工艺制备出Mg-Cu多相储氢材料;XRD分析表明烧结产物为Mg2Cu、MgCu2和Cu三相,经20次的吸放氢循环后,该多相材料的储氢量质量分数为2.55%;根据PCT测试结果,得到放氢平衡压和温度的关系式为InP(atm)=-9 006.8/T+17.817,从而得到1.0 atm下的放氢温度为233℃. 相似文献
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热处理对La_(0.9)Nd_(0.1)(NiCoMnAl)_5电极性能的影响 总被引:3,自引:0,他引:3
研究了热处理对La0.9Nd0.1(NiCoMnAl)5电极材料结构、成分、脱氢压力-组成等温曲线(PCT)、循环寿命的影响。X射线衍射结果表明热处理降低了评价主相峰的半高宽(FWHM)平均值,即降低了晶格应力。采用JSM-840能谱分析仪对热处理前后合金成分进行分析,发现热处理使得合金中的La、Mn向晶内扩散,而Ni、Co、Al却向晶界偏聚。测定了室温下热处理前后的合金脱氢PCT曲线及其电极循环寿命曲线,结果表明热处理使电极放电容量有所降低,同时却又使电极循环寿命有所提高,并且还降低了合金平衡压。 相似文献
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