Layered double hydroxide-derived Mg_(2)Ni/TiH_(1.5)composite catalysts for enhancing hydrogen storage performance of MgH_(2)  

作　　者：Gang Huang Yao Lu Xiaofang Liu Wukui Tang Xinyu Li Feng Wang Jianglan Shui Ronghai Yu 

机构地区：[1]School of Materials Science and Engineering,Beihang University,No.37 Xueyuan Road,Beijing 100191,PR China [2]School of Materials Science and Engineering&Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,PR China

出　　处：《Journal of Magnesium and Alloys》2024年第12期4966-4975,共10页镁合金学报(英文)

基　　金：supported by National Key Research and Development Program of China(2021YFB4000601);National Natural Science Foundation of China(51731002,U21A20328)。

摘　　要：Developing efficient catalysts is of great significance in improving the sluggish kinetics and high desorption temperature of Mg H_(2)hydrogen storage material.Here,ultrathin Ni Ti-layered double hydroxide(Ni Ti-LDH)nanosheets are used as precursors to prepare Mg_(2)Ni/TiH_(1.5)composite catalysts to improve the hydrogen storage properties of MgH_(2).The variation of Ni/Ti ratio in LDH plays an important role in regulating the composition,morphology and distribution of Mg_(2)Ni/Ti H_(1.5)catalysts,which significantly affect their synergistic catalytic effect.Mg_(2)Ni/TiH_(1.5)composite catalyst exhibits significantly improved catalytic performance compared with conventional Ni-,Ti-and Ni/Ti-based catalysts.The optimal Mg H_(2)/Mg_(2)Ni/TiH_(1.5)system shows a significantly reduced desorption temperature of 212℃which is 133℃lower than that of pure MgH_(2)(345℃),and can release 5.97 wt%hydrogen within 300s at 300℃.Further mechanism analysis reveals that the unique flaky morphology and suitable composition of Ni/Ti LDH can significantly enhance the synergistic effect of Mg_(2)Ni and TiH_(1.5),which promotes the fracture of the H–H and Mg-H bonds.

关 键 词：Hydrogen storage materials MgH_(2) Layered double hydroxides NANOCATALYSTS 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ426[化学工程]