The as-prepared Ti-Zr hydride powder is used as dopant to improve hydrogen storage properties of NaAlH4 upon mechanical milling under argon atmosphere. The as-milled sample is investigated by X-ray diffraction(XRD),sc...The as-prepared Ti-Zr hydride powder is used as dopant to improve hydrogen storage properties of NaAlH4 upon mechanical milling under argon atmosphere. The as-milled sample is investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM) and Sievert's technology test. It is observed that Ti-Zr hydride doped NaAlH4 discharges 2.7% and 4.0%(mass fraction) of hydrogen in 40 min and 11 h at 160 ℃,respectively,and keeps its reversible dehydrogenation capacity at 4.0%(mass fraction) after 10 hydrogenation/dehydrogenation cycles. These results show the Ti-Zr hydride doped NaAlH4 has good reversible hydrogen storage capacity and kinetics. XRD and SEM investigations also show that the doped Ti-Zr hydride uniformly distributes in NaAlH4 substrate and keeps stable during the hydrogenation/dehydrogenation cycle,indicating that Ti-Zr hydride plays the main surface-catalytic role on improving reversible hydrogen storage properties of NaAlH4.展开更多
基金Projects(2006AA05Z131 2006AA05Z144) supported by the National High-Tech Research and Development Program of China
文摘The as-prepared Ti-Zr hydride powder is used as dopant to improve hydrogen storage properties of NaAlH4 upon mechanical milling under argon atmosphere. The as-milled sample is investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM) and Sievert's technology test. It is observed that Ti-Zr hydride doped NaAlH4 discharges 2.7% and 4.0%(mass fraction) of hydrogen in 40 min and 11 h at 160 ℃,respectively,and keeps its reversible dehydrogenation capacity at 4.0%(mass fraction) after 10 hydrogenation/dehydrogenation cycles. These results show the Ti-Zr hydride doped NaAlH4 has good reversible hydrogen storage capacity and kinetics. XRD and SEM investigations also show that the doped Ti-Zr hydride uniformly distributes in NaAlH4 substrate and keeps stable during the hydrogenation/dehydrogenation cycle,indicating that Ti-Zr hydride plays the main surface-catalytic role on improving reversible hydrogen storage properties of NaAlH4.
