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Facile synthesis of bowl-like 3D Mg(BH4)2-NaBH4-fluorographene composite with unexpected superior dehydrogenation performances

Abstract

A remarkable improvement in hydrogen desorption performance of Mg(BH4)2-NaBH4 eutectic composite is achieved by simply ball-milling with fluorographene (FG). It is found that the desorption temperature of Mg(BH4)2-NaBH4 (~200 °C) is still too high and liquid phase appears during dehydrogenation. Particularly, the novel bowl-like 3D Mg(BH4)2-NaBH4-FG composite can be formed after ball-milling. The novel Mg(BH4)2-NaBH4-FG exhibits a low dehydrogenation temperature of 114.9 °C with 6.9 wt.% of pure hydrogen in seconds. In-depth investigations show that such great improved hydrogen desorption properties of Mg(BH4)2-NaBH4-FG composite could be ascribed to both the “novel bowl-like 3D structure” with large specific surface area, and the “reactant destabilized modification” due to the decreases of reaction enthalpy caused by the formation of NaMgF3. This finding provides a facile preparation of complex borohydride composites with low dehydrogenation temperature and fast rate, which accelerates its practical application in fuel cell.

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Publication details

The article was received on 24 Mar 2017, accepted on 20 Apr 2017 and first published on 20 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA02595E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Facile synthesis of bowl-like 3D Mg(BH4)2-NaBH4-fluorographene composite with unexpected superior dehydrogenation performances

    J. Zheng, X. Xiao, L. Zhang, S. Li, H. Ge and L. Chen, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02595E

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