KOH活化的炭干凝胶及其储氢性能

摘要

以苯二酚与甲醛为前驱体,赖氨酸作为催化剂,快速合成了有机溶胶.有机溶胶经碳化以及KOH进一步活化,获得了具有较高微孔率和较大比表面积的炭干凝胶.研究了多孔炭干凝胶的储氢性能,比较了不同活化程度的炭干凝胶的最大储氢容量与比表面积、微孔体积以及微孔孔径分布的关系.结果表明,KOH适度活化的炭干凝胶(ACX-5)具有较高的比表面积(2204 m2·g-1)和较大的总孔容积(1.09 cm3· g-1),在77 K和1.1 MPa氢压下时其储氢量可达4.3wt％.%Organic xerogel was rapidly prepared via a lysine-catalyzed gelation process with resorcinol and formaldehyde as the precursors.After carbonization and a subsequent activation with KOH,carbon xerogels with high microporosity and high-specific-surface area could be obtained.The hydrogen storage properties of the porous carbon xerogels were studied.The relationship of the maximum hydrogen storage capacity with specific surfacearea,micropore volume and pore size distribution was investigated.The results show that moderately KOHactivated carbon xerogel (ACX-5) with high surface area of 2204 m2 ·g-1 and large total-pore volume of 1.09 cm3·g-1 exhibits the largest hydrogen storage capacity of 4.3wt％ at 77 K and under 1.1 MPa hydrogen pressure.