Hydrogen storage properties of Mg-Ni-Fe composites prepared by hydriding combustion synthesis and mechanical milling

Yunfeng Zhu, Yang Yang, Lingjun Wei, Zelun Zhao, Liquan Li

科研成果: 期刊稿件文章同行评审

25 引用 (Scopus)

摘要

We reported the structures and superior hydrogen storage properties of the composites Mg 90Ni 10-xFe x (x = 0, 2, 4, 6 and 8) prepared by the process of HCS + MM, i.e., the hydriding combustion synthesis followed by mechanical milling. By means of X-ray diffraction (XRD), scanning electron microscopy (SEM) with an energy dispersive X-ray spectrometer (EDX) and gas reaction controller (GRC), the crystal structures, surface morphologies and hydriding/dehydriding properties of the composites were studied in detail. The Mg 90Ni 10-xFe x (x = 2, 4, 6 and 8) composites consist of MgH 2, Mg, Mg 2NiH 4, Mg 2NiH 0.3 and Fe phases, while Mg 90Ni 10 is composed of MgH 2, Mg, Mg 2NiH 4 and Mg 2NiH 0.3. It is found that Mg 90Ni 2Fe 8 has the best hydriding properties, requiring only 30 s to absorb 97% of its saturated hydrogen capacity of 4.80 wt.% at 373 K. The best dehydriding result is obtained with Mg 90Ni 8Fe 2, which desorbs 2.02 and 4.40 wt.% hydrogen at 493 and 523 K, respectively. The microstructures of the composites prepared by HCS + MM have remarkable influences on the enhanced hydriding/dehydriding properties. In addition, the catalytic effects of Mg 2Ni and Fe phases during hydriding/dehydriding were discussed in this study.

源语言英语
页(从-至)207-212
页数6
期刊Journal of Alloys and Compounds
520
DOI
出版状态已出版 - 15 4月 2012

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