Abstract
Ball-milled Ti–B-doped sodium aluminum hydride was directly synthesized via mechanical ball-milling of a NaH/Al mixture. The mixture was completely hydrogenated to NaAlH4 after 70 h under hydrogen pressure of 1 MPa. And higher hydrogen pressure is beneficial for the conversion from NaH/Al mixture to NaAlH4. The dehydrogenation properties of the as-synthesized Ti–B-doped sodium aluminum were systematically investigated. The result shows that ball-milled Ti–B has a remarkable catalytic effect on the enhanced dehydrogenation properties of NaAlH4. As-synthesized Ti–B-doped NaAlH4 sample releases hydrogen at the temperature of about 100 °C. Approximately 4.15 wt% H2 is released from ball-milled Ti–B-doped NaAlH4 at 233.7 °C. Even at 110 °C, it also releases about 2.83 wt% hydrogen. The apparent activation energy (E a) for the first step is estimated to be 83.97 kJ·mol−1 using Arrhenius equation. Thus, utilization of ball-milled Ti–B as catalyst would substantially enhance the practical applications of NaAlH4 for hydrogen storage.
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