Hamamelis-like K2Ti6O13 Synthesized by Alkali Treatment of Ti3C2 MXene: Catalysis for Hydrogen Storage in MgH2

被引：111
作者：
Kong, Qianqian [2 ]
Zhang, Huanhuan [1 ]
Yuan, Zhenluo [1 ]
Liu, Jiameng [1 ]
Li, Lixin [2 ]
Fan, Yanping [1 ,2 ]
Fan, Guangxin [2 ]
Liu, Baozhong [1 ,2 ]
机构：
[1] Henan Polytech Univ, Coll Chem & Chem Engn, Jiaozuo 454000, Henan, Peoples R China
[2] Henan Polytech Univ, Coll Mat Sci & Engn, Jiaozuo 454000, Henan, Peoples R China
来源：
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2020年 / 8卷 / 12期
基金：
中国国家自然科学基金;
关键词：
MgH2; K2Ti6O13; Hydrogen storage; Catalytic mechanism; Synergistic effect; PRECURSOR; ENHANCEMENT; PERFORMANCE; DESORPTION; COMPOSITE; CAPACITY;
D O I：
10.1021/acssuschemeng.9b06936
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
An intriguing Hamamelis-like structure of K2Ti6O13 with branches of 10-20 nm in length is synthesized by alkali treatment of Ti3C2 MXene. It exhibits strong catalytic activity for hydrogen desorption from MgH2. The initial dehydrogenation temperature (175 degrees C) of a composite of MgH2 with 5 wt % K2Ti6O13 is 112 degrees C below that of pristine MgH2 . Isothermal dehydrogenation analysis indicates that the composite releases 6.7 wt % hydrogen at 280 degrees C within 3 min, and with 2.7 wt % hydrogen being released at 200 degrees C. The activation energy of this material (105.67 kJ mol(-1)) is 69.67 kJ mol(-1) lower than that of pristine MgH2. Its strong hydrogen adsorption/desorption capacity is attributed to the synergies of catalytic effects of KMgH3 , TiO, and Ti, which originated from K2Ti6O13. These findings make a contribution to study the H2 storage properties of metal hydrides doped with Ti3C2 MXene derivatives.
引用
收藏
页码：4755 / 4763
页数：9
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