Detailed Structural Analyses of KOH Activated Carbon from Waste Coffee Beans
Detailed Structural Analyses of KOH Activated Carbon from Waste Coffee Beans
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DOI：
10.1143/jjap.48.117001
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发表时间：
2009-11
影响因子：
1.5
通讯作者：
Tomokazu Takahata;I. Toda;Hiroki Ono;S. Ohshio;H. Akasaka;S. Himeno;T. Kokubu;H. Saitoh
中科院分区：
文献类型：
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作者：
Tomokazu Takahata;I. Toda;Hiroki Ono;S. Ohshio;H. Akasaka;S. Himeno;T. Kokubu;H. Saitoh
研究了以废咖啡豆为原料制备的KOH活性炭的微观结构变化与储氢性能的关系。当KOH与碳材料的重量比为5：1时，由N2吸附等温线计算的多孔碳材料的比表面积为2070 m2/g，并且作为微孔，孔径在约0.6至1.1 nm的范围内。在结构分析中，X射线衍射分析和拉曼光谱表明这些碳材料通过KOH活化发生了结构变化。石墨结构的顺序随着这种活化而向更小的尺度改变。理论上，使用由石墨结构的下降发展的碳材料提供的微孔增加比表面积。储氢能力随着这些结构变化而提高，并且在2070 m2/g时达到0.6wt%。这些结果表明，储氢能力是由碳材料对石墨的化学作用赋予的。
The relationship of the detailed structural change of KOH activated carbon and hydrogen storage ability was investigated in activated carbon materials fabricated from waste coffee beans. The specific surface area of porous carbon materials calculated from N2 adsorption isotherms stood at 2070 m2/g when the weight ratio of KOH to carbon materials was 5:1, and pore size was in the range of approximately 0.6 to 1.1 nm as micropores. In the structural analysis, X-ray diffraction analysis and Raman spectroscopy indicated structural change in these carbon materials through KOH activation. The order of the graphite structure changed to a smaller scale with this activation. It is theorized that specific surface area increased using micropores provided by carbon materials developed from the descent of the graphite structure. Hydrogen storage ability improved with these structural changes, and reached 0.6 wt % at 2070 m2/g. These results suggest that hydrogen storage ability is conferred by the chemical effect on graphite of carbon materials.