Improving dehydrogenation properties of Mg/Nb composite films via tuning Nb distributions  

作　　者：Wen-Cheng Huang Jun Yuan Jin-Guo Zhang Jiang-Wen Liu Hui Wang Liu-Zhang Ouyang Mei-Qin Zeng Min Zhu 

机构地区：[1]Key Laboratory of Advanced Energy Storage Materials of Guangdong Province,School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China

出　　处：《Rare Metals》2017年第7期574-580,共7页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51621001,51571091,and 51471070);Guangdong Natural Science Foundation(Nos.2016A030312011 and 2014A030313222)

摘　　要：t To investigate the effect of Nb on the dehydro- genation properties of Mg-Nb composite films, Mg/Nb eight- layer film and Mg- 10 at% Nb alloy film with the similar Mg- to-Nb atomic ratio were prepared by magnetron sputtering. Results show that both Mg/Nb eight-layer film and Mg- 10 at% Nb alloy film exhibit excellent de/hydrogenation properties. Mg- 10 at% Nb alloy film starts to release hydrogen at 108 ℃, and its desorption peak temperature is lower to 146 ℃, which is much better than that of pure MgH2 under the same condi- tion. Scanning electron microscopy （SEM） results demon- strate that the dispersive Nb nanoparticles in Mg/Nb eight- layer film may serve as nucleation sites for Mg ←→ MgH2 reactions, which can provide channels for H diffusion. For Mg- 10 at% Nb alloy film, the uniform distributions of Nb can accelerate the hydrogen diffusion and effectively improve the dehydrogenation kinetics for MgH2. This study provides an enlightening way for designing and preparing Mg-based composite films with excellent dehydrogenation properties.t To investigate the effect of Nb on the dehydro- genation properties of Mg-Nb composite films, Mg/Nb eight- layer film and Mg- 10 at% Nb alloy film with the similar Mg- to-Nb atomic ratio were prepared by magnetron sputtering. Results show that both Mg/Nb eight-layer film and Mg- 10 at% Nb alloy film exhibit excellent de/hydrogenation properties. Mg- 10 at% Nb alloy film starts to release hydrogen at 108 ℃, and its desorption peak temperature is lower to 146 ℃, which is much better than that of pure MgH2 under the same condi- tion. Scanning electron microscopy （SEM） results demon- strate that the dispersive Nb nanoparticles in Mg/Nb eight- layer film may serve as nucleation sites for Mg ←→ MgH2 reactions, which can provide channels for H diffusion. For Mg- 10 at% Nb alloy film, the uniform distributions of Nb can accelerate the hydrogen diffusion and effectively improve the dehydrogenation kinetics for MgH2. This study provides an enlightening way for designing and preparing Mg-based composite films with excellent dehydrogenation properties.

关 键 词：Hydrogen storage Mg-Nb SPUTTERING THINFILM Kinetics 

分 类 号：TB34[一般工业技术—材料科学与工程] TB383.2