Ti基催化剂改性的NaAlH4储氢材料研究进展  

Research Progress in Ti-Based Catalysts-Modified NaAlH Hydrogen Storage Materials

作　　者：任壮禾 张欣[1] 高明霞[1] 潘洪革[1] 刘永锋[1] Ren Zhuanghe;Zhang Xin;Gao Mingxia;Pan Hongge;Liu Yongfeng(State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang Universily,Hangzhou 310027,China)

机构地区：[1]浙江大学材料科学与工程学院,硅材料国家重点实验室,浙江杭州310027

出　　处：《稀有金属》2021年第5期569-582,共14页Chinese Journal of Rare Metals

基　　金：国家重点研发计划项目(2018YFB1502102);浙江省自然科学基金项目(LD21E010002);国家自然科学基金项目(51671172,U1601212);青年拔尖人才支持计划项目资助。

摘　　要：高储氢容量、低工作温度的储氢材料一直是固态储氢技术领域研究的重点。NaAlH4具有适中的热力学稳定性和较高的储氢容量,被认为是最具应用前景的高容量储氢材料之一。但高的动力学壁垒导致其吸放氢温度较高,动力学较慢,可逆性较差。大量的研究表明,Ti基催化剂的引入可以有效降低其动力学能垒,从而降低其吸放氢温度,提高其吸放氢速率,改善其吸放氢可逆性。基于此,重点综述了近期Ti基催化剂改善NaAlH4储氢性能的研究进展,以期为该体系材料的进一步发展提供有价值的参考。首先介绍了Ti基催化剂的不同添加方式,然后归纳总结了各种Ti基催化剂对NaAlH4储氢性能的改善作用以及催化机制,最后讨论了催化改性NaAlH4储氢材料未来的研究发展方向。Hydrogen storage materials with high hydrogen capacity and low operating temperature had attracted intense interests for solid state hydrogen storage application.Sodium alanate(NaAlH4)with suitable thermodynamics and relatively high capacity was one of the most promising hydrogen storage materials for practical applications.However,high kinetic barriers induced high operating temperature,slow hydrogen release/uptake rate and poor reversibility.Considerable studies revealed that the addition of Ti-based catalysts could effectively improve its kinetic performance,consequently reducing the de-/hydrogenation temperature and enhancing the hydrogen storage reversibility.In this work,recent research progress of hydrogen storage properties of NaAlH4 modified by Ti-based catalysts was reviewed to guide the future development of this hydrogen storage system.First,the doping methods of Ti-based catalysts were introduced.After that,the improvement in hydrogen storage performance of NaAlH4 with various Ti-based catalysts was summarized and the corresponding catalytic mechanisms were elucidated.Finally,the future research direction of catalyst-modified NaAlH4 was discussed.It was well known that the addition process of catalysts was closely related to its existing state and distribution in metal hydride matrix,which affected the catalytic functions.High-energy ball milling treatment not only reduced the particle sizes of catalysts and NaAlH4 but also increased the uniform distribution of catalysts and intimate contact with NaAlH4 caused by energetic collision between milling balls.This facilitated the high catalytic activity.As a result,high-energy ball milling was the most frequently used and effective preparation strategy for catalyst-modified NaAlH4-based hydrogen storage materials.For optimizing catalysts,a variety of Ti-based compounds,including Ti-based organic compounds,halides,oxides and intermetallics,were studied and evaluated for their catalytic activity.Their effects on hydrogen storage behaviors of NaAlH4 were com

关 键 词：储氢材料 配位氢化物 NaAlH4 Ti基催化剂 催化机制 

分 类 号：TK91[动力工程及工程热物理]