Titanium Hydride Nanoplates Enable 5wt% of Reversible Hydrogen Storage by Sodium Alanate below 80°C

被引：13

作者：

Ren, Zhuanghe ^{[1
,2
]}

Zhang, Xin ^{[1
,2
]}

Li, Hai-Wen ^{[3
]}

Huang, Zhenguo ^{[4
]}

Hu, Jianjiang ^{[5
]}

Gao, Mingxia ^{[1
,2
]}

Pan, Hongge ^{[1
,2
,6
]}

Liu, Yongfeng ^{[1
,2
,6
]}

机构：

[1] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China

[3] Hefei Gen Machinery Res Inst, Hefei 230031, Peoples R China

[4] Univ Technol Sydney, Sch Civil & Environm Engn, 81 Broadway, Ultimo, NSW 2007, Australia

[5] Yantai Univ, Sch Chem & Chem Engn, Yantai 264005, Peoples R China

[6] Xian Technol Univ, Inst Sci & Technol New Energy, Xian 710021, Peoples R China

来源：

RESEARCH | 2021年 / 2021卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

CATALYTIC-ACTIVITY; COMPLEX HYDRIDES; METALLIC TI; NAALH4; DEHYDROGENATION; KINETICS; PERFORMANCES; MECHANISM; NAH/AL; MXENE;

D O I：

10.34133/2021/9819176

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Sodium alanate (NaAlH4) with 5.6 wt% of hydrogen capacity suffers seriously from the sluggish kinetics for reversible hydrogen storage. Ti-based dopants such as TiCl4, TiCl3, TiF3, and TiO2 are prominent in enhancing the dehydrogenation kinetics and hence reducing the operation temperature. The tradeoff, however, is a considerable decrease of the reversible hydrogen capacity, which largely lowers the practical value of NaAlH4. Here, we successfully synthesized a new Ti-dopant, i.e., TiH2 as nanoplates with similar to 50nm in lateral size and similar to 15 nm in thickness by an ultrasound-driven metathesis reaction between TiCl4 and LiH in THF with graphene as supports (denoted as NP-TiH2@G). Doping of 7 wt% NP-TiH2@G enables a full dehydrogenation of NaAlH4 at 80 degrees C and rehydrogenation at 30 degrees C under 100 atm H-2 with a reversible hydrogen capacity of 5 wt%, superior to all literature results reported so far. This indicates that nanostructured TiH2 is much more effective than Tidopants in improving the hydrogen storage performance of NaAlH4. Our finding not only pushes the practical application of NaAlH4 forward greatly but also opens up new opportunities to tailor the kinetics with the minimal capacity loss.

引用

页数：13