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An Investigation on Hydrogen Storage Kinetics of the Nanocrystalline and Amorphous LaMg12-type Alloys Synthesized by Mechanical Milling

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Journal of Wuhan University of tech.ology(materials sci.nce) 2018年第2期33卷 278-287页

作者：张羊换 WANG Jinglong ZHANG Peilong ZHU Yongguo HOU Zhonghui SHANG Hongwei Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China beijing whole win materials sci. & tech. co. ltd. Beijing 100083 China

Nanocrystalline and amorphous LaMg_（12）-type LaMg_（11）Ni ＋ x wt% Ni（x = 100, 200） alloys were synthesized by mechanical milling. Effects of Ni co.tent and milling time on the gaseous and electrochemical hydrogen storage kinetics of as-milled alloys were investigated systematically. The electrochemical hydrogen storage properties of the as-milled alloys were tested by an automatic galvanostatic system. And the gaseous hydrogen storage properties were investigated by Sievert apparatus and a differential scanning calorimeter（DSC） co.nected with a H_2 detector. Hydrogen desorption activation energy of alloy hydrides was estimated by using Arrhenius and Kissinger methods. It is found that the increase of Ni co.tent significantly improves the gaseous and electrochemical hydrogen storage kinetic performances of as-milled alloys. Furthermore, as ball milling time changes, the maximum of both high rate discharge ability（HRD） and the gaseous hydriding rate of as-milled alloys can be obtained. But the hydrogen desorption kinetics of alloys always increases with the extending of milling time. Moreover, the improved gaseous hydrogen storage kinetics of alloys are ascribed to a decrease in the hydrogen desorption activation energy caused by increasing Ni co.tent and milling time.

关键词： LaMg12 alloy mechanical milling activation energy hydrogen storage kinetics

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Effect of rapid quenching on the microstructure and electrochemical characteristics of La_(0.6)Ce_(0.4)Ni_(3.6)co.(0.65)Mn_(0.4)Al_(0.2)Ti_(0.05_(FeB)_(0.1) hydrogen storage alloy

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Rare Metals 2010年第6期29卷 593-596页

作者： ZHANG Peilong SONG Xiping WANG Xiuli PEI Pei LUO Guiping TU Jiangping CHEN Guoliang State Key Laboratory for Advanced Metals and materials University of Science and Technology BeijingBeijing 000China whole win(beijing) materials sci.& tech.co. Ltd.Beijing 100083China Department of materials sci.nce and Engineering Zhejiang UniversityHangzhou 310027China

In order to improve the cycling stability of AB5 type alloy electrodes,rapid quenching tech.ology and new alloy co.position design were employed.A hydrogen storage alloy with nominal co.position La0.6Ce0.4Ni3.6co..65Mn0.4Al0.2Ti0.05（FeB）0.1 was prepared by vacuum magnetic levitation melting under high purity argon atmosphere,followed by rapid quenching at different co.ling *** results show that all alloys exhibit the single-phase CaCu5-type *** tests indicate that rapid quenching can slightly improve the cycling life of the ***,the high-rate dischargeability of the quenched alloys is lower than that of the as-cast alloy.

关键词： hydrogen storage alloys electrochemical properties rapid quenching microstructure

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Structure and electrochemical performances of Mg20-xYxNi10（x=0-4） alloys prepared by mechanical milling

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Rare Metals 2019年第10期38卷 954-964页

作者： Yang-Huan Zhang Xi-Ping Song Pei-Long Zhang Yong-Guo Zhu Hui-Ping Ren Bao-Wei Li Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China State Key Laboratory for Advanced Metals and materials University of Science and Technology BeijingBeijing 100083China beijing whole win materials sci.&tech.co. Ltd.Beijing 100083Chin

Mg2Ni-type Mg20-xYxNi10(x=0,1,2,3 and4) electrode alloys were fabricated by vacuum induction ***,the as-cast alloys were mechanically milled on a planetary-type ball *** effects of milling time and Y co.tent on the microstructures and electrochemical performances of the alloys were investigated in *** results show that nanocrystalline and amorphous structure can be successfully obtained through mechanical *** substitution of Y for Mg facilitates the glass forming of the Mg2Ni-type alloy and significantly enhances the electrochemical characteristics of the alloy ***,the discharge capacity of Y-free alloy monotonously grows with the milling time prolonging,while that of the Y-substituted alloys has the maximum values in the same *** milling time of obtaining the greatest discharge capacity markedly decreases with Y co.tent *** electrochemical kinetics of the alloys,including high rate discharge ability(HRD),diffusion co.fficient(D),limiting current density(IL) and charge transfer rate,monotonously increase with milling time extending.

关键词： Mg2Ni-type alloy Y substitution for Mg Milling duration Electrochemical performances

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