TiN catalyst for the reversible hydrogen storage performance of sodium alanate system

Li Li; Fangyuan Qiu; Yijing Wang; Guang Liu; Yanan Xu; Cuihua An; Yaping Wang; Lifang Jiao; Huatang Yuan

doi:10.1039/C2JM31388J

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Journal of Materials Chemistry

Issue 27, 2012

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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Paper

TiN catalyst for the reversible hydrogen storage performance of sodium alanate system

Li Li,^a Fangyuan Qiu,^a Yijing Wang,*^a Guang Liu,^a Yanan Xu,^a Cuihua An,^a Yaping Wang,^a Lifang Jiao^a and Huatang Yuan^a

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Corresponding authors

Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin Key Lab of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, P.R. China
E-mail: wangyj@nankai.edu.cn ;
Fax: +86 22 23503639 ;
Tel: +86 22 23503639

J. Mater. Chem., 2012,22, 13782-13787

DOI: 10.1039/C2JM31388J
Received 06 Mar 2012, Accepted 01 May 2012
First published online 01 May 2012

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A TiN catalyst was used to synthesize NaAlH₄via the mechanical milling of a NaH–Al mixture under 2 MPa hydrogen pressure. The dehydrogenation thermodynamics and kinetics of the as-synthesized TiN-doped NaAlH₄ were systematically investigated. Thermodynamic analyses show that the dehydrogenation rate clearly increases with a corresponding increase of dehydrogenation temperature. The apparent activation energy (E_a) for the first step is estimated to be 45.15 kJ mol⁻¹ by using the Arrhenius equation. The dehydrogenation and hydrogenation behaviors of TiN-doped NaAlH₄ are investigated under different hydrogen pressures using high-pressure differential scanning calorimetry (HP-DSC). Interestingly, the onset dehydrogenation temperature of TiN-doped NaAlH₄ is lowered to about 100 °C with a peak of 138.05 °C. X-Ray diffraction and XPS results reveal that the TiN nanopowders possess excellent catalytic stability.