镁/碳复合纳米材料制备及放氢相转化率研究

Preparation of Mg-C Nanocomposite Study on Phase Transformation Rate of Hydrogen Desorption

引入微晶碳与Mg、Ni等金属复合,制备了70Mg30C4Ni复合储氢材料,其储氢密度在4.56%(质量分数)以上,放氢量为4.50%(质量分数),放氢时间为8min。260℃恒温放氢在65min内可释放出77%的氢气,说明Ni对镁碳复合储氢材料放氢性能具有较好的催化作用。通过计算,其平均纳米晶粒度为27.6nm。

The crystallite carbon is introduced in this article, which has never been reported, then is compoun- ded with Mg and Ni. The compound 70Mg30C4Ni is prepared successfully. For this material, the hydrogen storage density is above 4. 56wt%. Using the method of draining, 70Mg30C4Ni is measured that the hydrogen desorption capacity is 4. 56wt%, and the hydrogen desorption time is 8 minutes. This material can desorb 77% of the total hydrogen in 65 minutes at 260℃. Owing to the carbon crystallite, the magnesium powder is milled dispersedly and finely. The size of the particle is nanometer. It is showed that Ni has good catalysis to the hydrogen desorption performance of the storage hydrogen material of magnesium and carbon.