Ti_(3)AICN MAX for tailoring MgH_(2) hydrogen storage material:from performance to mechanism  

作　　者：Xing-Qing Duan Guang-Xu Li Wen-Hui Zhang Hui Luo Hai-Mei Tang Li Xu Peng Sheng Xin-Hua Wang Xian-Tun Huang Cun-Ke Huang Zhi-Qiang Lan Wen-Zheng Zhou Jin Guo Mohammd Bin Ismail Hai-Zhen Liu 

机构地区：[1]Guangxi Novel Battery Materials Research Center of Engineering Technology,Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology,School of Physical Science and Technology,Guangxi University,Nanning,530004,China [2]State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing,102209,China [3]Department of Materials Science and Engineering,Zhejiang University,Hangzhou,310027,China [4]Department of Materials Science and Engineering,Baise College,Baise,533000,China [5]Energy Storage Research Group,Faculty of Ocean Engineering Technology and Informatics,Universiti Malaysia Terengganu,Kuala Nerus,21030,Malaysia

出　　处：《Rare Metals》2023年第6期1923-1934,共12页稀有金属（英文版）

基　　金：financially supported by the Science and Technology Department of Guangxi Zhuang Autonomous (No.GuiKeAD21238022);the Natural Science Foundation of Guangxi Province (No.2019GXNSFBA185004);National Natural Science Foundation of China (Nos.52001079,51961005 and 52261038)。

摘　　要：Many MXenes are efficient catalysts for MgH_(2)hydrogen storage material.Nevertheless,the synthesis of MXenes should consume a large amount of corrosive HF to etch out the Al layers from the transition metal aluminum carbides or nitrides(MAX) phases,which is environmentally unfriendly.In this work,Ti_(3)AlCN MAX without HFetching was employed directly to observably enhance the kinetics and the cycling stability of MgH_(2).With addition of10 wt% Ti_(3)AlCN,the onset dehydrogenation temperature of MgH2 was dropped from 320 to 205℃,and the rehydrogenation of MgH2 under 6 MPa H2 began at as low as50℃.Furthermore,at 300℃,it could provide 6.2 wt% of hydrogen in 10 min.Upon cycling,the composite underwent an activation process during the initial 40 cycles,with the reversible capacity increased from 4.7 wt% to 6.5 wt%.After that,the capacity showed almost no attenuation for up to 100 cycles.The enhancing effect of Ti_(3)AICN on MgH_(2) was comparable to many MXenes.It was demonstrated that Ti_(3)AICN did not destabilize MgH_(2) but acted as an efficient catalyst for MgH_(2).Ti_(3)AICN was observed to be the active sites for the nucleation and growth of MgH_(2)and might also help in dissociation and recombination of hydrogen molecules.Such two factors are believed to contribute to the improvement of MgH_(2).This study not only provides a promising strategy for improving the hydrogen storage performances of MgH_(2) by using noncorrosive MAX materials,but also adds evidence of nucleation and growth of MgH_(2) on a catalyst.

关 键 词：Hydrogen storage Magnesium hydride MAX MXene Titanium aluminum carbonitride 

分 类 号：TB34[一般工业技术—材料科学与工程]