Enhanced methane storage of chemically and physically activated carbide-derived carbon
Enhanced methane storage of chemically and physically activated carbide-derived carbon
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DOI：
10.1016/j.jpowsour.2009.02.019
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发表时间：
2009-06
影响因子：
9.2
通讯作者：
Sun-Hwa Yeon;S. Osswald;Y. Gogotsi;J. Singer;J. Simmons;J. Fischer;M. Lillo-Ródenas;Á. Linares-Solano-Á
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文献类型：
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作者：
Sun-Hwa Yeon;S. Osswald;Y. Gogotsi;J. Singer;J. Simmons;J. Fischer;M. Lillo-Ródenas;Á. Linares-Solano-Á
通过氯化碳化物产生的碳化物衍生碳（CDC）在原子水平上提供了精确的孔径控制的巨大潜力，使其成为储能介质的有吸引力的候选者。经CO2或KOH活化的CDC具有明显的孔隙率改善，显示出超过3000 m2 g-1的比表面积和超过1.3cm3g-1的孔体积。这些对应于在35巴和25°C下16wt%的重量甲烷吸收，接近于在35巴和17°C下目前最好报道的材料PCN-14（金属有机骨架（M0 F））或在35巴和25°C下KOH活化的无烟煤。最好的过量重量甲烷吸收是用975°C下用CO2活化2小时的TiC衍生的CDC获得的，即在25°C和60巴下产生3360 m2 g − 1的非常大的表面积，导致18.5wt%。为了获得真实的甲烷体积容量，测量了完全干燥的CDC的堆积密度，从中我们获得了在875°C下用CO2活化8小时的CDC的145 v（STP）v− 1的过量容量，35 bar和25°C下DOE目标（180 v（STP）v−1）的81%。从小角X射线散射（SAXS）测量，孔回转半径（Rg）在0.5 nm和1 nm之间的测定。甲烷等温吸附曲线表明，在低负荷初期，吸附热可达24 kJmol − 1。
Carbide-derived carbons (CDCs) produced by chlorination of carbides offer great potential for precise pore size control at the atomic level, making them attractive candidates for energy storage media. CDCs activated with CO2or KOH possess distinct improvements in porosity, displaying specific surface areas above 3000m2g−1and pore volumes above 1.3cm3g−1. These correspond to gravimetric methane uptake of 16wt% at 35bar and 25°C, close to the currently best reported material PCN-14, a metal-organic framework (MOF), at 35bar and 17°C or KOH activated anthracite at 35bar and 25°C. The best excess gravimetric methane uptake is obtained with a TiC-derived CDC activated with CO2at 975°C for 2h, namely a very large surface area of 3360m2g−1resulting in 18.5wt% at 25°C and 60bar. To obtain realistic volumetric methane capacity, the packing density of completely dried CDC was measured, from which we obtain excess capacity of 145v(STP)v−1from CDC activated with CO2at 875°C for 8h, 81% of the DOE target (180v(STP)v−1) at 35bar and 25°C. From small-angle X-ray scattering (SAXS) measurements, pore radii of gyration (Rg) between 0.5nm and 1nm are determined. Temperature-dependent methane isotherms show that the isosteric heat of adsorption reaches 24kJmol−1at the initial stage of low loading.