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为了评估混合稀土金属镍系贮氢材料的实用性和探讨其循环寿命机理,笔者进行了一系列吸放氢循环实验。全部循环实验在笔者研制的一台自动切换循环装置上进行。这台装置可以同时对12种不同的材料进行循环实验,并可连续调节实验温度、压力、循环时间等参数,换用不同的氢气源。经过工业普氢2000多次循环后材料吸氢量下降了30%～5O%,其中MHHC—05性能最佳。对4～5次及2124次循环后的样品分别进行了X衍射、XPS等分析测试。结果表明,吸放氢循环不断地导致稀土元素的连续分凝,气源中的杂质O_2、H_2O等和稀土元素发生作用,生成稀土氧化物和氢氧化物,使材料吸氢量下降。本文还讨论了Al、Cu等合金元素对材料循环性能的影响。
In order to evaluate the practicability of mixed rare earth metal nickel-based hydrogen storage materials and to explore their cycle life mechanism, the author conducted a series of hydrogen absorption and desorption cycle experiments. All loop experiments developed in the author of an automatic switching cycle device. The device can simultaneously test 12 different materials, and can continuously adjust the experimental temperature, pressure, cycle time and other parameters, with a different hydrogen source. After industrial hydrogen over 2000 cycles more than hydrogen cycle material absorption of hydrogen decreased by 30% ~ 5O%, of which MHHC-05 performance best. The samples after 4 ~ 5 times and 2124 cycles were respectively analyzed by X-ray diffraction and XPS. The results show that the cycle of hydrogen absorption and desorption continuously leads to the continuous deaggregation of rare earth elements. O_2, H_2O and other impurities in the gas source interact with the rare earth elements to form rare earth oxides and hydroxides, thus reducing the amount of hydrogen absorbed by the materials. This article also discussed the Al, Cu and other alloying elements on the material cycle performance.