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介绍了一种新的制备纳米石墨粉的方法———炸药爆轰法 .通过对爆轰合成的黑色粉末进行x射线衍射分析 ,确认其为六方结构的纳米石墨 ,平均晶粒度为 1 86— 2 6 1nm .用BET气体吸附仪测试纳米石墨粉的比表面积约为5 0 0— 6 5 0m2 g,由比表面积计算得到的纳米石墨粒度为 4 4 1— 6 85nm .在室温 (≈ 2 90K)和 12MPa压力条件下对纳米石墨粉进行储放氢气性能测试 ,结果表明纳米石墨粉样品的储放氢量为 0 33wt%— 0 37wt% .在相同实验条件下 ,纳米石墨粉原始样品的储放氢能力较原始纳米炭纤维 (0 15wt%— 0 35wt% )和多壁碳纳米管 (0 15wt%— 0 2 0wt% )的储放氢能力略强 ,但低于超级活性炭 (0 92wt%— 0 98wt% ) .纳米碳材料的比表面积在其储放氢实验中起关键作用 .
A new method of preparing nano-graphite powder, namely detonation detonation method, was introduced.According to the X-ray diffraction analysis of black powder synthesized by detonation, the nano-graphite with hexagonal structure was confirmed to have an average grain size of 1 86 - 2 6 1nm BET surface area of graphite powder with a BET specific surface area of about 500-650m2 g, calculated from the specific surface area of the nano-graphite particle size 4 4 1- 6 85nm at room temperature (≈ 2 90K ) And 12MPa pressure on the performance of hydrogen storage of nano-graphite powder, the results show that nano-graphite powder stored hydrogen content of 0 33wt% - 0 37wt% under the same experimental conditions, the original sample of nano-graphite storage The hydrogen storage capacity is slightly stronger than that of the original carbon nanofibers (0 15wt% -035wt%) and multi-walled carbon nanotubes (0 15wt% - 0 2wt%), but lower than that of the super activated carbon (0 92wt% - 0 98wt%) .The specific surface area of carbon nanomaterials plays a key role in hydrogen storage experiments.