Hydrogen Storage Performances of Nanocrystalline and Amorphous NdMg11Ni+x wt% Ni （x=100, 200） Alloys Synthesized by Mechanical Milling
来源期刊：Acta Metallurgica Sinica2019年第9期
论文作者：Yang-Huan Zhang Kai-Feng Zhang Ze-Ming Yuan Peng-Peng Wang Ying Cai Wen-Gang Bu Yan Qi
文章页码：1089 - 1098
摘 要：Nanocrystalline and amorphous NdMg12-type NdMg11Ni+x wt% Ni（ x = 100, 200） alloys were successfully prepared through ball milling（BM）. The microstructures and electrochemical properties were systematically studied to get a more comprehensive understanding of the sample alloys. The maximum discharging capacity could be obtained at only two cycles, indicating that as-milled alloys have superior activation capability. The more the Ni content, the better the electrochemical properties of the as-milled samples. To be specific, the discharge capacities of x = 100 and x = 200（BM 20 h） samples are 128.2 and 1030.6 mAh/g at 60 mAh/g current density, respectively, revealing that enhancement of Ni content could significantly improve the discharging capacities of the samples. Additionally, milling duration obviously influences the electrochemical properties of the samples. The discharging capacity always rises with milling duration prolonging for the x = 100 sample,but that of the（ x = 200） sample shows a trend of first augment and then decrease. The cycling stability of the（ x = 100） alloy clearly decreases with extending milling duration, whereas that of the（ x = 200） alloy first declines and then augments under the same conditions. In addition, the high rate discharge（HRD） abilities of the sample display the maximal values as milling duration changes. The HRD(HRD = C300/C60× 100%) values of the as-milled alloys（ x = 100, 200） are 80.24% and 85.17%,respectively.
Yang-Huan Zhang1,2，Kai-Feng Zhang1,2，Ze-Ming Yuan1,2，Peng-Peng Wang1,2，Ying Cai1，Wen-Gang Bu2，Yan Qi2
1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology2. Department of Functional Material Research, Central Iron and Steel Research Institute
摘 要：Nanocrystalline and amorphous NdMg12-type NdMg11Ni+x wt% Ni（ x = 100, 200） alloys were successfully prepared through ball milling（BM）. The microstructures and electrochemical properties were systematically studied to get a more comprehensive understanding of the sample alloys. The maximum discharging capacity could be obtained at only two cycles, indicating that as-milled alloys have superior activation capability. The more the Ni content, the better the electrochemical properties of the as-milled samples. To be specific, the discharge capacities of x = 100 and x = 200（BM 20 h） samples are 128.2 and 1030.6 mAh/g at 60 mAh/g current density, respectively, revealing that enhancement of Ni content could significantly improve the discharging capacities of the samples. Additionally, milling duration obviously influences the electrochemical properties of the samples. The discharging capacity always rises with milling duration prolonging for the x = 100 sample,but that of the（ x = 200） sample shows a trend of first augment and then decrease. The cycling stability of the（ x = 100） alloy clearly decreases with extending milling duration, whereas that of the（ x = 200） alloy first declines and then augments under the same conditions. In addition, the high rate discharge（HRD） abilities of the sample display the maximal values as milling duration changes. The HRD(HRD = C300/C60× 100%) values of the as-milled alloys（ x = 100, 200） are 80.24% and 85.17%,respectively.
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