Hydrogen storage properties of Mg–Ni–C system hydrogen storage materials prepared by hydriding combustion synthesis and mechanical milling
Hydrogen storage properties of Mg–Ni–C system hydrogen storage materials prepared by hydriding combustion synthesis and mechanical milling
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DOI：
10.1016/j.ijhydene.2010.03.094
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发表时间：
2010-06
影响因子：
7.2
通讯作者：
Yunfeng Zhu;Zhibing Liu;Yang Yang-Yang;H. Gu;Liquan Li;Mei Cai
中科院分区：
文献类型：
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作者：
Yunfeng Zhu;Zhibing Liu;Yang Yang-Yang;H. Gu;Liquan Li;Mei Cai
将碳气凝胶和纳米镍粉混合后球磨，再与镁粉混合，然后采用包覆燃烧合成法（HCS）制备了Mg-Ni-C复合储氢材料。通过机械研磨进一步处理HCS产物10小时。通过X射线衍射（XRD）、扫描电镜（SEM）和压力-组成-温度（PCT）测试等手段研究了Ni/C比对材料结构和吸放氢性能的影响。结果表明，90 Mg-6 Ni-4C体系的吸放氢性能最好，饱和吸氢量为5.23wt.%在373 K下，在68 s内解吸3.74 wt在523 K下，1800 s内产生氢气。该体系的放氢起始温度为430 K，比90 Mg-10 Ni体系低45 K，比90 Mg-10 C体系低95 K。Ni/C复合材料的吸放氢性能的提高与Ni/C比和复合材料的结构密切相关。
Mg–Ni–C composite hydrogen storage materials were prepared by first ball milling the powder mixtures of carbon aerogel and nano-Ni, and then mixed with magnesium powder followed by hydriding combustion synthesis (HCS). The HCS product was further treated by mechanical milling for 10 h. The effect of Ni/C ratio on the structures and hydrogen absorption/desorption properties of the materials were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and pressure–composition–temperature (PCT) measurements. It is found that 90Mg–6Ni–4C system shows the best hydriding/dehydriding properties, which absorbs hydrogen at a saturated capacity of 5.23 wt.% within 68 s at 373 K and desorbs 3.74 wt.% hydrogen within 1800 s at 523 K. Moreover, the dehydriding onset temperature of the system is 430 K, which is 45 K lower than that of 90Mg–10Ni system or 95 K lower than that of 90Mg–10C system. The improved hydriding/dehydriding properties are related greatly to the Ni/C ratio and the structures of the composite systems.