Structural and desorption characterisations of milled (MgH2+Y,Ce) powder mixtures for hydrogen storage
Structural and desorption characterisations of milled (MgH2+Y,Ce) powder mixtures for hydrogen storage
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DOI：
10.1016/j.ijhydene.2006.11.035
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发表时间：
2007-09
影响因子：
7.2
通讯作者：
C. Shang;Zhengxiao Guo
中科院分区：
文献类型：
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作者：
C. Shang;Zhengxiao Guo
采用机械球磨的方法对(MgH_2+Y，Ce)混合物进行机械球磨处理，以改善其吸氢性能。通过一系列的实验技术研究了其结构演变和放氢性能。X射线衍射分析表明，在球磨过程中，在相关混合物中形成了稳定的氢化物相CeH2.35或YH3。用热重分析(TG)和差示扫描量热分析(DSC)表征了球磨混合物的放氢性能。球磨(MgH_2+Ce)样品的脱附动力学高于(MgH_2+Y)样品。CeO2在(MgH_2+Ce)混合物中的形成有利于脱附动力学，这可能是由于在MgH_2上形成表面缺陷和氧化物的表面催化作用所致。
(MgH2+Y,Ce) mixtures were processed by mechanical milling in an attempt to improve the hydrogen sorption properties of MgH2. The structural evolution and hydrogen desorption properties were investigated by a range of experimental techniques. XRD analysis shows the formation of a stable hydride phase, CeH2.35or YH3, in the relevant mixture during milling. Hydrogen desorption of the milled mixtures was characterised by coupled thermogravimetry (TG) and differential scanning calorimetry (DSC). Milled (MgH2+Ce) samples show higher desorption kinetics than the (MgH2+Y). The formation of CeO2in the (MgH2+Ce) mixture benefits the desorption kinetics, likely due to the formation of surface defects on MgH2and surface catalysis by the oxide.