首页|超晶格La-Mg/Y-Ni复合储氢合金晶体结构及性能研究进展

超晶格La-Mg/Y-Ni复合储氢合金晶体结构及性能研究进展

Research progress on crystal structures and properties of superlattice La-Mg/Y-Ni composite hydrogen storage alloys

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超晶格La-Mg/Y-Ni复合储氢合金具有放电容量大、能量密度高和成本低等优点,是一种重要的氢能存储和转换材料,目前主要用做镍氢电池负极材料和直接硼氢化物燃料电池阳极催化剂.La-Mg-Ni复合合金最初是在La-Ni基储氢合金的基础上,通过用部分Mg替代La而发展起来的.由于La-Mg-Ni复合合金中金属Mg熔点、沸点低,易挥发,导致采用常规熔炼法很难制备;同时合金中的Mg在碱性电解液中容易腐蚀、氧化,导致合金的循环稳定性差.为克服La-Mg-Ni复合合金制备困难和循环稳定性差等问题,研究者又在La-Ni基储氢合金的基础上,通过用部分Y替代La开发出了La-Y-Ni合金.La-Mg-Ni和La-Y-Ni复合合金具有非常相似的超晶格结构,均能表现出很好的储氢性能,均属于同一类新型超晶格结构储氢合金.本文对La-Mg/Y-Ni储氢合金近 20多年的研究成果进行了梳理.本文首先介绍超晶格La-Mg-Ni和La-Y-Ni复合合金的相结构组成及相结构的演变规律,同时分析了Mg元素和Y元素部分替代La元素分别对La-Mg/Y-Ni合金结构和性能的影响,然后讨论了La-Mg/Y-Ni复合合金中的相结构对合金性能的影响.最后,指出了超晶格La-Mg/Y-Ni复合储氢合金未来所面临的挑战和发展方向.
The La-Mg/Y-Ni composite hydrogen storage alloys with superlattice structure have the advantages of large discharge capacity,high energy density and low cost,and are important hydrogen energy storage and conver-sion material.At present,they are mainly used as the negative material of nickel-metal hydride batteries and anode catalyst of direct borohydride fuel cell.Superlattice La-Mg-Ni composite alloy was originally developed on the basis of La-Ni based hydrogen storage alloy by replacing La with partial Mg.Due to the low melting point and boiling point of Mg and its volatility,La-Mg-Ni alloy is difficult to be prepared by conventional melting method.At the same time,Mg in the alloy is easy to corrode and oxidize in the alkaline electrolyte,resulting in poor cycling stability of the La-Mg-Ni alloy.In order to overcome the difficulties in the preparation and the poor cycle stability of La-Mg-Ni composite alloy,the researchers also developed La-Y-Ni alloy on the basis of La-Ni based hydrogen storage alloy by replacing La with partial Y.La-Mg-Ni and La-Y-Ni alloys have very similar superlattice structures,and both can show good hydrogen storage properties.It can be seen that they belong to the same class of new superlattice struc-ture hydrogen storage alloys.The research achievements of La-Mg/Y-Ni composite hydrogen storage alloys in the past 20 years are reviewed in this paper.The crystal structure and structure evolution of superlattice La-Mg/Y-Ni hydrogen storage alloys are introduced in this paper.Then,the effects of Mg element and Y element partial substitu-tion of La element on the structure and properties of La-Mg/Y-Ni composite alloy are analyzed.At the same time,the effect of phase structures on the properties of La-Mg/Y-Ni composite alloys are discussed.Finally,the future challenges and development directions of superlattice La-Mg/Y-Ni composite hydrogen storage alloys are pointed out.

hydrogen storage materialsLa-Mg-Ni composite hydrogen storage alloyLa-Y-Ni composite hydro-gen storage alloyphase structureelectrochemical properties

张晓杰、田晓、张颖、韩家乐、杨艳春、塔娜

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内蒙古师范大学 物理与电子信息学院,呼和浩特 010022

内蒙古师范大学 稀土功能新能源储能材料内蒙古自治区工程研究中心,呼和浩特 010022

内蒙古师范大学 功能材料物理与化学自治区重点实验室,呼和浩特 010022

储氢材料 La-Mg-Ni复合储氢合金 La-Y-Ni复合储氢合金 相结构 电化学性能

内蒙古自治区高等学校碳达峰碳中和研究专项内蒙古自治区科技计划项目内蒙古自治区科技计划项目国家自然科学基金项目内蒙古自然科学基金项目

STZX2022072019GG2642023YFHH0059218650212021MS05047

2024

10.13801/j.cnki.fhclxb.20231017.001

复合材料学报
北京航空航天大学 中国复合材料学会

复合材料学报

CSTPCD北大核心
影响因子：0.933
ISSN：1000-3851
年,卷(期)：2024.41(3)
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