Milovanović S, Matović L, Drvendzija M, Novaković J G
Department of Material Science, Vinca Institute of Nuclear Sciences, PO Box 522, 11001 Belgrade, Serbia.
J Microsc. 2008 Dec;232(3):522-5. doi: 10.1111/j.1365-2818.2008.02113.x.
To investigate the effects of specific porous microstructure of diatomite on the hydrogen storage properties of MgH(2), a two-step preparation was carried out. The first step was decrepitation of MgH(2) particle size during 10 h of milling. The second step was additional 1 h of milling with diatomite. The microstructure and phase composition of materials was characterized by X-ray diffraction, whereas the powder morphology and degree of additive dispersion were analyzed by scanning electron microscopy. The hydrogen desorption behaviour of nanocomposites was investigated by differential scanning calorimetry. The results show that addition of porous diatomite structure leads to decrease in desorption temperature, since there was no other effect that can have an influence on kinetics, such as formation of the metastable gamma-phase, reduction of oxides to the native metal and/or homogeneous dispersion of the catalyst. This indicates that the microstructure of added material plays the main role in the enhancement of desorption properties of composites.
为了研究硅藻土特定多孔微观结构对MgH₂储氢性能的影响，进行了两步制备。第一步是在球磨10小时期间使MgH₂粒径发生爆裂。第二步是与硅藻土再额外球磨1小时。通过X射线衍射对材料的微观结构和相组成进行表征，而通过扫描电子显微镜分析粉末形态和添加剂分散程度。通过差示扫描量热法研究纳米复合材料的氢解吸行为。结果表明，添加多孔硅藻土结构导致解吸温度降低，因为不存在其他可对动力学产生影响的效应，如亚稳γ相的形成、氧化物还原为原生金属和/或催化剂的均匀分散。这表明添加材料的微观结构在增强复合材料解吸性能方面起主要作用。
