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Issue 3, 2013
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Improved hydrogen storage performance of Ca(BH4)2: a synergetic effect of porous morphology and in situ formed TiO2

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Abstract

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 CaB2H7–0.1TiO2 system, compared with the dense Ca(BH4)2. The desorption peak temperature is reduced by more than 50 °C and sorption capacity of ca. 5 wt% H2 is rapidly achieved below 300 °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 °C for 1 h, to 350 °C at 90 bar H2. 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 CaB2H7–0.1TiO2 system are also proposed.

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

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Publication details

The article was received on 18 Nov 2012, accepted on 16 Dec 2012 and first published on 17 Dec 2012


Article type: Paper
DOI: 10.1039/C2EE24121H
Citation: Energy Environ. Sci., 2013,6, 847-858
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    Improved hydrogen storage performance of Ca(BH4)2: a synergetic effect of porous morphology and in situ formed TiO2

    J. Gu, M. Gao, H. Pan, Y. Liu, B. Li, Y. Yang, C. Liang, H. Fu and Z. Guo, Energy Environ. Sci., 2013, 6, 847
    DOI: 10.1039/C2EE24121H

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