Hierarchical porous graphene-based carbons prepared by carbon dioxide activation and their gas adsorption properties
Hierarchical porous graphene-based carbons prepared by carbon dioxide activation and their gas adsorption properties
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DOI：
10.1016/j.ijhydene.2014.05.059
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发表时间：
2014-07
影响因子：
7.2
通讯作者：
Kaisheng Xia;Xi-ke Tian;Shunxin Fei;Kun You
中科院分区：
文献类型：
--
作者：
Kaisheng Xia;Xi-ke Tian;Shunxin Fei;Kun You
通过简单的二氧化碳活化氧化石墨制备了多层多孔石墨烯基碳。研究了活化温度对碳的结构和织构性质以及气体吸附能力的影响。HPGCs具有层次化的微细-大孔结构，比表面积高达532cm2g−1，大孔体积高达1.67cm3g−1。此外，HPGC材料对CO2和H2具有良好的吸附性能。在850C下活化2小时后得到的HPGC-850对CO2的最大吸附容量在273K和1bar时为7.74%(1.76mmolg−1)，在77K和1bar时为0.75%(3.76mmolg−1)。
Hierarchical porous graphene-based carbons (HPGCs) have been prepared by a simple carbon dioxide activation of graphite oxide. The effects of activation temperature on the structural and textural properties as well as gas adsorption capacities of the resultant carbons have been investigated. The HPGCs showed hierarchically micro-meso-macroporous structures, high specific surface areas of up to 532 m2g−1, and large pore volumes of up to 1.67 cm3g−1. Moreover, the HPGC materials were demonstrated to be efficient for CO2and H2adsorption. The HPGC-850, which was obtained after two hours of activation at 850 °C, exhibited the highest adsorption capacities of 7.74 wt% (1.76 mmol g−1) at 273 K and 1 bar for CO2and of 0.75 wt% (3.76 mmol g−1) at 77 K and 1 bar for H2.