To improve the hydrogenation and dehydrogenation dynamics of NdMg12-type alloy,we replaced part of Mg with Ni in thesamples and used the ball milling method to prepare NdMg11Ni+x wt.%Ni(x=100,200)samples.The infuences...To improve the hydrogenation and dehydrogenation dynamics of NdMg12-type alloy,we replaced part of Mg with Ni in thesamples and used the ball milling method to prepare NdMg11Ni+x wt.%Ni(x=100,200)samples.The infuences of millingduration and Ni content on the electrochemical and gascous dynamics of the samples were studied in detail.Dehydrogena-tion activation cnergies of samples were calculated by using Kissinger and Arrhenius methods.The conclusions show thatthe dynamic properties of samples are significantly enhanced with the increase in Ni content.With the change of the miling duration,the gaseous hydrogenation rate and high rate discharging capability reach the maximal values.However,thedehydrogenation dynamics of sample alloys are always enhanced with the prolonging of milling duration.More concretely,prolonging milling duration from 5 to 60 h improves the dehydrogenation ratio of NdMgNi+100 wt.%Ni alloy from58.03%to 64.81%and that of NdMgNi+200 wt.%Ni alloy from 62.20%to 71.59%.Besides,the enhancement of gaseoushydrogen storage dynamics of the samples is believed to be the result of the declined dehydrogenation activation energyresulted from the increase in milling duration and Ni content.展开更多
基金It is sincere thanks to the National Natural Science Foundation of China(Nos.51871125 and 51761032)the MajorScience and Technology Innovation Projects in Shandong Province(2019JZZYO10320)for the financial support of this work.
文摘To improve the hydrogenation and dehydrogenation dynamics of NdMg12-type alloy,we replaced part of Mg with Ni in thesamples and used the ball milling method to prepare NdMg11Ni+x wt.%Ni(x=100,200)samples.The infuences of millingduration and Ni content on the electrochemical and gascous dynamics of the samples were studied in detail.Dehydrogena-tion activation cnergies of samples were calculated by using Kissinger and Arrhenius methods.The conclusions show thatthe dynamic properties of samples are significantly enhanced with the increase in Ni content.With the change of the miling duration,the gaseous hydrogenation rate and high rate discharging capability reach the maximal values.However,thedehydrogenation dynamics of sample alloys are always enhanced with the prolonging of milling duration.More concretely,prolonging milling duration from 5 to 60 h improves the dehydrogenation ratio of NdMgNi+100 wt.%Ni alloy from58.03%to 64.81%and that of NdMgNi+200 wt.%Ni alloy from 62.20%to 71.59%.Besides,the enhancement of gaseoushydrogen storage dynamics of the samples is believed to be the result of the declined dehydrogenation activation energyresulted from the increase in milling duration and Ni content.
