Ti-Mn基高容量固态低压储氢合金研究  

Properties and Structure of Ti-Mn Based High-Capacity Solid Low Pressure Hydrogen Storage Alloys

作　　者：吴岱丰 李睿 陈鹏允 周庆 唐仁衡 肖方明 Wu Daifeng;Li Rui;Chen Pengyun;Zhou Qing;Tang Renheng;Xiao Fangming(Institute of Rare Metals Development,Guangdong Academy of Sciences,Guangzhou 510651,China)

机构地区：[1]广东省科学院稀有金属研究所,广东广州510651

出　　处：《稀有金属》2023年第3期357-364,共8页Chinese Journal of Rare Metals

基　　金：国家科技部重点研发项目(国际合作专项,2018YFE0100700);广东省科学院关于2020年度建设国内一流研究机构专项资金项目(2020GDASYL-20200103105);广东省基础与应用基础研究基金区域联合基金项目(2020B1515120006);包头创建国家资助示范区——铁路客车智能化镍氢电池系统成果转化项目(XM2020BT04)资助。

摘　　要：为了推动氢储能系统的实用化,需要开展用于规模储氢用途的储氢合金的配方研究。以Ti_(0.9)5Zr_(0.05)Mn_(2)合金作为研究对象,开发储氢量高、平台压力合适且容易活化AB_(2)型储氢合金,系统研究加入V-Fe,调整Mn含量,以及用纯金属V与Fe替代V-Fe等方法对调整储氢合金性能的作用。研究发现加入V-Fe会使得储氢合金晶格参数增大,提高储氢合金的活化性能,但过多V-Fe会大幅度降低合金吸/放氢平台压与储氢量;提高Mn含量会导致吸/放氢平台与上升,储氢量先增后减,在A侧元素稍微过量时(B/A=1.96(摩尔比))有利于获得综合性能较好的合金;用纯金属V与Fe替代V-Fe能进一步提高储氢合金性能,随着Fe/V比例增加,合金储氢量下降,吸/放氢平台压上升,平台斜率下降。最终优化出综合性能良好的Ti_(0.9)5Zr_(0.05)Mn_(1.46)V_(0.39)Fe_(0.13),该合金能在80℃下活化,在20℃吸放氢平台分别为1.812和0.751 MPa,储氢量为1.83%。In order to promote the practical application of hydrogen storage system,it is necessary to carry on research on large-scale application hydrogen storage alloys.Among the hydrogen storage alloy,Ti-Mn based AB_(2) type hydrogen storage alloy,with high hydro⁃gen storage capacity,adjustable platform pressure,and low raw materials price,is a suitable candidate for large-scale application of hydrogen storage materials.However,Ti-Mn based hydrogen storage alloy suffers from some questions:(1)harsh alloy activation con⁃ditions;(2)high platform pressure of hydrogen absorption/desorption;(3)high slope and hysteresis factor of hydrogen absorption/de⁃sorption platform.Element substitution is an effective method to improve the properties of Ti-Mn based hydrogen storage alloy.To de⁃velop Ti-Mn based hydrogen storage alloy for solid state hydrogen storage system,the effects of adding V-Fe,tuning Mn content and replacing V-Fe with pure metal V and Fe on the properties of hydrogen storage alloys Ti_(0.9)5Zr_(0.05)Mn_(2) were investigated systematically.The activation properties of Ti-Mn based hydrogen storage alloy could be tuned by adding V-Fe,while the platform pressure and plat⁃form features(slope and hysteresis)could be moderated by tuning Mn content,and replacing V-Fe with pure metal V and Fe.Ti-Mn based hydrogen storage alloys were synthesized by vacuum arc melting.Additionally,there was 4%more Mn in the raw materials to make up the loss during the melting.Before testing,the alloys were crushed by hammer to particles less than 150μm.The phases of the alloys were characterized by X-ray diffraction(XRD),while the lattice parameters were computed by Fundamental Parameters Ap⁃proach(TOPAS-5 Academic software).The hydrogen storage properties of alloy were characterized by the pressure-component-temper⁃ature(P-C-T)curves,which were tested by Sieverts type hydrogen storage material performance test system.Before P-C-T testing,al⁃loys were activated twice at the activation condition:vacuum at 80℃for 30 min,and t

关 键 词：Ti-Mn基储氢合金 元素替代 活化性能 储氢量 平台压力 

分 类 号：TL259[核科学技术—核燃料循环与材料]