纳米碳管储能的化学原理与储存容量研究

通过在大温度、压力范围内系统地测定氢在纳米碳管粉末与压片上的吸附等温线和对所得等温线的理论分析,计算出吸附热,并用超临界气体的吸附模型充分地描述了氢在纳米碳管上的吸附行为,证明纳米碳管储氢的原理是超临界吸附;比表面积和储气温度控制着储气容量.甲烷在干纳米碳管上的吸附机理与氢气相同,但在湿纳米碳管中的存储机理在于甲烷水合物的生成,因此孔容控制储气容量.单位质量多壁管的湿储容量是干储容量的5.1倍 ,单壁管可能产生更大的增强存储作用.

Studies on the Chemical Principle and Capacity of Carbon Nanotubes as Energy Storage Materials

The chemical principle of hydrogen uptake by carbon nanotubes was proven to be the physisorption of supercritical gases. This conclusion was reached based on the value of the adsorption heat evaluated from a set of adsorption isotherms for a wide range of temperature and pressure as well as the fitness of the model for supercritical adsorption with the experimental isotherms. The specific surface area of the nanotubes and the temperature of storage control the capacity. The adsorption of methane on dry carbon nanotubes behaves the same way as the adsorption of hydrogen. However, the storage of methane in wet carbon nanotubes is based on the formation of methane hydrate and the size of pore volume controls the storage capacity. The storage capacity in wet multiwalled carbon nanotubes is 5.1 times higher than in dry nanotubes, and the single wall carbon nanotubes might be the best carrier of methane.