Hydrogen sorption properties of Ti-Zr hydride doped NaAlH4

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. A02; pp. 985 - 988
• Main Author: 庄鹏辉 刘晓鹏 李志念 王树茂 蒋利军 李华玲
• Format: Journal Article
• Language: English
• Published: 01.11.2007
• Subjects: 储氢合金; 储氢性能; 钛-锆氢化物掺杂; 铝氧化钠
• ISSN: 1003-6326

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 NaAIH4 has good reversible hydrogen storage capacity and kinetics. XRD and SEM investigations also show that the doped Ti-Zr hydride uniformly distributes in NaAIH4 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,