Comparative pore structure analysis of highly porous graphene monoliths treated at different temperatures with adsorption of N2 at 77.4 K and of Ar at 87.3 K and 77.4 K
Comparative pore structure analysis of highly porous graphene monoliths treated at different temperatures with adsorption of N2 at 77.4 K and of Ar at 87.3 K and 77.4 K
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在不同温度处理的高度多孔石墨烯整料的孔结构比较分析，在 77.4 K 下吸附 N2，在 87.3 K 和 77.4 K 下吸附 Ar
DOI：
10.1016/j.micromeso.2015.01.014
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Kaneko
中科院分区：
文献类型：
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作者：
S. Wang;D. Minami;K. Kaneko
我们在Ar气中通过高温处理制备了不同孔隙率的纳米多孔石墨烯单块。用77.4 K下的N2吸附等温线和87.3 K和77.4 K下的Ar吸附等温线对孔隙率进行了比较评价。在77.4 K下的N2吸附显示出低于3 × 10− 3相对压力的过量吸附量，这是由N2分子的四极矩引起的。这种效应对用扣除孔效应法（SPE）测定总表面积、Dubininin-Radushkevich法（DR）测定总孔体积和Gurvitch规则测定总孔体积没有显著影响。然而，由Horvath-Kawazoe（HK）方法测定的77.4 K下N2吸附的纳米颗粒尺寸分布的峰比87.3 K下Ar吸附的纳米颗粒尺寸分布的峰小0.05-0.09 nm。
We prepared nanoporous graphene monolith of different porosity by high temperature treatment up to 2073 K in Ar. The porosity is comparatively evaluated with N2adsorption isotherms at 77.4 K and Ar adsorption isotherms at 87.3 K and 77.4 K. N2adsorption at 77.4 K shows an excess adsorption amount below 3 × 10−3of the relative pressure which is caused by the quadrupole moment of an N2molecule. This effect doesn't give significant influence on the determination of the total surface area from subtracting pore effect (SPE) method, the micropore volume from Dubinin-Radushkevich (DR) method and the total pore volumes from the Gurvitch rule. However, the peak of the micropore size distribution determined by Horvath–Kawazoe (HK) method from N2adsorption at 77.4 K shifts to a smaller size than that from Ar adsorption at 87.3 K by 0.05–0.09 nm.