Improved hydrogen storage performance of Ca(BH4)2: a synergetic effect of porous morphology and in situ formed TiO2

被引：40

作者：

Gu, Jian ^{[1
,2
]}

Gao, Mingxia ^{[1
,2
]}

Pan, Hongge ^{[1
,2
]}

Liu, Yongfeng ^{[1
,2
]}

Li, Bo ^{[1
,2
]}

Yang, Yanjing ^{[1
,2
]}

Liang, Chu ^{[1
,2
]}

Fu, Hongliang ^{[1
,2
]}

Guo, Zhengxiao ^{[3
]}

机构：

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

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

[3] UCL, Dept Chem, London WC1H 0AJ, England

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2013年 / 6卷 / 03期

基金：

中国国家自然科学基金;

关键词：

CALCIUM BOROHYDRIDE; REVERSIBILITY; HYDRIDES; ABSORPTION; CATALYSIS; ADDITIVES; RELEASE; SIZE;

D O I：

10.1039/c2ee24121h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A porous Ca(BH4)(2)-based hydride, CaB2H7, with nano-TiO2 introduced in situ, was successfully synthesized via mixing Ca(BH4)(2) with Ti(OEt)(4) followed by heat treatment. The effects of the porous structure and introduction of TiO2 on both the non-isothermal and isothermal hydrogen desorption-absorption properties of the porous system were systematically investigated. The results show significant improvements on both the kinetics and thermodynamics of hydrogen desorption-absorption of the porous CaB2H7-0.1TiO(2) system, compared with the dense Ca(BH4)(2). The desorption peak temperature is reduced by more than 50 degrees C and sorption capacity of ca. 5 wt% H-2 is rapidly achieved below 300 degrees C. The porous structure was retained in the dehydrogenated products, and rapid hydrogen absorption, approximately 80% of the desorption capacity, is obtained upon heating the product, post-dehydrogenated at 300 degrees C for 1 h, to 350 degrees C at 90 bar H-2. External addition of nano-TiO2 also enhances the hydrogen storage properties of Ca(BH4)(2), but to a lesser extent, compared with the synergetic effect of the porous structure and the in situ formed nano-TiO2. In addition, desorption-absorption mechanisms of the porous CaB2H7-0.1TiO(2) system are also proposed.

引用

页码：847 / 858

页数：12

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