A Filed Design for High Efficiency of Storing Hydrogen in Composites Made by Charged Particle Assemble Method.

氢储存材料是下一代能源使用所必需的，它可以高密度、安全地储存氢。采用带电粒子组装法制备了Mg和Ni复合粒子，并对其储氢性能进行了研究。Mg本质上具有大量储氢的能力，而Ni则表现出分解氢的催化作用。为了研究微粒最大带电条件，进行了摩擦带电实验。制备Mg-Ni粉末2g，粉末中Mg与Ni的比例为2比1或3比2。将混合的粉末放入丙烯酸或玻璃容器中，用转速为60rpm的磨机进行研磨。研磨后，用法拉第笼测量粉末的电荷。Mg粉末在研磨过程中没有电荷，而Ni粉末在玻璃容器中停留4 min时电荷最大。然后，在Mg颗粒上包覆带电的Ni颗粒。测试了复合颗粒的储氢性能。其性能对复合颗粒的包覆分数很敏感。采用液相还原法制备了包覆Ni颗粒的Ti颗粒。Ti- ni复合颗粒的储氢量与Ti颗粒基本相同，但复合粉末中的分解温度比Ti粉末中的分解温度低。

Hydrogen storage materials, which can densely and safety store hydrogen, are required for use of next generation energy. Composite particles of Mg and Ni were fabricated by charged particle assemble method, and their properties for hydrogen storage were investigated. Mg essentially has an ability of storing much hydrogen, and Ni shows catalysis for hydrogen decomposition. In order to research the condition of maximum charging of the particles, experiments of frictional electrification were performed. 2g of Mg-Ni powder was prepared and the ratio of Mg to Ni in the powder is 2 to 1 or 3 to 2. The mixed powder was put into acrylic or glassy vessel, and milled by a mill rotating at 60rpm. After milling, charge of the powder was measured by a Faraday cage. Mg powder showed no charge in the milling, but Ni had the maximum charge in the glassy vessel for 4 min. Then, Mg particles were coated with charged Ni particles. Hydrogen storage properties of these composite particles were measured. The properties were sensitive to coating fraction of the composite particles.Ti particles coated with Ni particles ware made by liquid-phase reduction method. The amount of hydrogen storage in the Ti-Ni composite particles was almost the same of Ti particles, but the decomposition temperature in the composite powder became lower than that in Ti powder.