La-Mg-Ni系A2B7型合金相结构与储氢性能研究进展-中国材料进展

文章信息/Info

Title:: Investigation on Phase Structure and Hydrogen Storage Properties of La-Mg-Ni-Based A2B7-Type Alloys

Author(s):: LI Yuan; CHEN Kangli; WANG Wenfeng; ZHANG Lu; HAN Shumin; (School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China)

Keywords:: hydrogen storage alloys; La-Mg-Ni-based alloys; super-lattice alloys; phase structure; hydrogen storage properties

摘要:: 氢的燃烧热值高、储量丰富、燃烧产物零污染，被认为是理想的能源载体。氢能的发展对“双碳”目标的实现具有重要的支撑作用，而氢能的发展又离不开高密度、低成本的储氢材料。La-Mg-Ni系A2B7型储氢合金是在La-Ni二元合金的基础上发展起来的一类新型储氢合金，具有储氢容量高、原料成本低等优势。Mg加入到La-Ni合金后进入到\[A2B4\]亚单元中，抑制了氢致非晶化现象，使结构保持稳定，加速了合金的实用化进程。La-Mg-Ni系A2B7型储氢合金本征储氢容量可达到1.80%以上（质量分数），显著高于已经商品化的AB5型储氢合金。La-Mg-Ni系A2B7型储氢合金的晶体结构可调控性强，并且容易受到组成与制备条件细微变化的影响。基于以上认识，重点关注了关于La-Mg-Ni系A2B7型储氢合金组成与制备技术等相关的研究报道，较为系统地综述了元素取代和制备技术等对La-Mg-Ni系A2B7型储氢合金相结构与储氢性能及电化学性能的影响，总结了合金发展中尚需解决的问题，为制备性能优良的合金提供了思路与依据，并对合金未来的发展趋势进行了展望。

Abstract:: Hydrogen has been considered as an ideal energy carrier owing to its high combustion heat, abundant resource and zero pollutant. Development of hydrogen energy will play a positive effect on carbon peaking and carbon neutrality goals, while it requires high-capacity and low-cost functional hydrogen storage materials. La-Mg-Ni-based A2B7-type hydrogen storage alloys originated from La-Ni binary alloys have the advantages of high capacity, low raw material cost. Mg addition into \[A2B4\] sub-units in La-Ni binary alloys suppresses hydrogen introducing amorphization and strengthens the bulk structure. The capacity of La-Mg-Ni-based A2B7-type hydrogen storage alloys is as high as 1.80wt%, much higher than commercial AB5type alloys. The crystal structure of La-Mg-Ni-based A2B7-type hydrogen storage alloys is adjustable and usually influenced by elemental substitution and preparation techniques. Based on these above, this paper reviews the influence of elemental substitution and preparation techniques on phase structure and hydrogen storage properties of La-Mg-Ni-based A2B7-type hydrogen storage alloys and points out problems in alloy development. It is devoted to providing ideas and theoretical guidance for getting highperformance La-Mg-Ni-based A2B7-type hydrogen storage alloys.