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
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J. Mater. Chem., 2012,22, 13782-13787
06 Mar 2012,
01 May 2012
First published online
01 May 2012
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.
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Journal of Materials Chemistry
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