碳纳米纤维吸附储氢性能分析

The performance analysis of hydrogen adsorption storage in carbon nanofibres

文中综合碳纳米纤维微观结构的表征结果以及氢吸脱附等温线的实验测量结果,对碳纳米纤维的吸附储氢性能进行了综合分析,分析发现:比表面积和中孔容积均与氢吸附量成线性关系;微孔容积对材料吸附性能影响较大,微孔容积与氢吸附量成抛物线关系;氢在常温左右以及77K下的吸附等温线呈现超临界气体的吸附特征,氢在273K和353K下的吸脱附等温线也基本重合,呈现的是物理吸附的特征。实验结果还说明:常温左右,甚至是77K下,碳纳米纤维均不适合于氢的吸附储存。

The performance of carbon nanofibres for hydrogen adsorption storage is analyzed based on the results of the microstructure characterization and experiments. The analyzed results show that the relationship between the specific surface and the mesopore volume and the hydrogen adsorption is linear. The micropores volume pays more impact on hydrogen adsorption ability, and the relationship between the micropores volume and the hydrogen adsorption is parabolic. Hydrogen adsorption isotherms at ambient temperature and 77K, and hydrogen adsorption and desorption isotherms at 273K and 353K are measured. The experimental results show the adsorption isotherms have characters of supercritical gas adsorption, and the adsorption isotherms and the desorptions are largely reversible, which is the physisorption character. The experiment results show that carbon nanofibres are not suited to hydrogen adsorption storage at ambient temperature, even at 77K.