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Issue 27, 2012
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TiN catalyst for the reversible hydrogen storage performance of sodium alanate system

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Abstract

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 (Ea) 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.

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

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Publication details

The article was received on 06 Mar 2012, accepted on 01 May 2012 and first published on 01 May 2012


Article type: Paper
DOI: 10.1039/C2JM31388J
Citation: J. Mater. Chem., 2012,22, 13782-13787
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    TiN catalyst for the reversible hydrogen storage performance of sodium alanate system

    L. Li, F. Qiu, Y. Wang, G. Liu, Y. Xu, C. An, Y. Wang, L. Jiao and H. Yuan, J. Mater. Chem., 2012, 22, 13782
    DOI: 10.1039/C2JM31388J

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