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对18种铸造态合金,包括二元合金Mg-Ni、Mg-Mm和三元合金Mg-Ni-Mm、Mg-Ni-TM(TM=过渡金属(Cu,Zn,Mn和Co);Mn=含Ce,La,Nd和Pr的混合稀土),采用电化学方法进行氢化,选取最具有潜力的电化学贮氢材料。将这些合金在80°C的6mol/LKOH溶液中以电流密度100A/m2氢化480min。为了评价合金的电化学氢化性能,采用辉光放电光谱法测定氢化后合金的最大氢气浓度、氢渗透深度、总的吸氢质量。采用光学和扫描电子显微镜、能谱和X射线衍射测试分析合金的结构与相组成。结果表明,Mg-25Ni-12Mm和Mg-26Ni合金具有最大的吸氢质量,其吸附的最大的氢浓度分别为1.0%和1.6%;主要的氢化产品为二元氢化物MgH2,在Mg-25Ni-12Mm合金中也检测到有三元氢化物Mg2NiH4。讨论了电化学氢化参数对合金的结构、合金化元素和氢化机理的影响。
Eighteen cast alloys including binary alloys Mg-Ni, Mg-Mm and ternary alloys Mg-Ni-Mm, Mg-Ni-TM TM = transition metals Cu, Zn, Mn and Co; Containing rare earth elements such as Ce, La, Nd and Pr), electrochemical hydrogenation was used to select the most promising electrochemical hydrogen storage materials. These alloys were hydrogenated in a 6 mol / L KOH solution at 80 ° C for 480 min at a current density of 100 A / m2. In order to evaluate the electrochemical hydrogenation performance of the alloy, the maximum hydrogen concentration, the hydrogen penetration depth and the total hydrogen absorption mass of the hydrogenated alloy were measured by glow discharge spectroscopy. The structure and phase composition of the alloy were analyzed by optical and scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that Mg-25Ni-12Mm and Mg-26Ni alloys have the largest hydrogen absorption mass, and the maximum hydrogen concentration is 1.0% and 1.6% respectively. The main hydrogenation product is binary hydride MgH2, Ternary hydride Mg2NiH4 was also detected in -12Mm alloy. The effects of electrochemical hydrogenation parameters on the structure, alloying elements and hydrogenation mechanism were discussed.