二次活化对活性炭储氢性能的影响

The Influence of Reactivation on Hydrogen Storage of Active Carbon

储氢技术是燃料电池汽车完成商业化推广的主要技术障碍之一.高比表面积的活性炭材料是近年来车载储氢介质的主要研究热点之一.本文采用KOH与商业活性炭物理混合,在管式炉中二次活化处理商业活性炭,通过二次处理实现对材料的改性.采用氮气吸脱附等温线、XRD、SEM等分析方法对样品进行了分析测试,实验结果显示:制备的材料具有较大的比表面积(2860m2g-1)和较大的孔容(1.50cm3g-1),与普通商业活性炭相比,其吸附性能增强,储氢性能增加,在77K,1bar的条件下储氢量到达了2.12wt%.为以后制备具有超高比表面积的超级活性炭材料奠定了基础.

Hydrogen storage technology is one of the main technical barriers to promote the commercializa- tion of fuel cell vehicles. The active carbon material with high specific surface is the main research focus about motor hydrogen storage medium. In this paper, the changes of pore structure and surface properties were investi- gated under different techniques. XRD, SEM and N2 adsorption were used to characterize the samples. The re- suits show that the material prepared is of higher specific surface （about 2860m2g-1） and cavity capacity （about 1.50 cm3g-1 ） than those of current commercial active carbon. Compared with ordinary commercial active car- bon, the adsorption ability of the prepared material increased, and the hydrogen storage ability increased as well, reaching 2.12wt% under 77K and lbar.