Hydrogen Storage Behaviors by Adsorption on Multi-Walled Carbon Nanotubes
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- 作者：Mahrokh Elyassi ; Alimorad Rashidi…
- 关键词：Hydrogen adsorption ; Carbon nanotubes ; CVD ; Surface properties
- 刊名：Journal of Inorganic and Organometallic Polymers and Materials
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：27
- 期：1
- 页码：285-295
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Inorganic Chemistry; Organic Chemistry; Polymer Sciences;
- 出版者：Springer US
- ISSN：1574-1451
- 卷排序：27
文摘
In the present study, MWCNTs were synthesized through CVD method, employing CH4 as carbon source over Co-Mo/MgO nanocatalyst at a temperature of 1000 °C and then treated by two methods. First by KOH activation (A-MWCNTs), with a weight ratio of KOH: MWCNTs = 3:1 at 900 °C in He atmosphere and second treated by H2SO4: HNO3 = 3:1 (F-MWCNTs). MWCNT samples were characterized by FE-SEM, TEM, XRD, FT-IR, BET and Raman spectroscopy. The adsorption of H2 gas was performed using volumetric method. Various parameters on adsorption of H2 including surface defects, surface areas, pore characteristics and functional groups have been investigated. Furthermore, it was found that the hydrogen adsorption of P-MWCNTs, A-MWCNTs and F-MWCNTs were 0.67, 1.24 and 0.40 wt%, respectively at room temperature (298 K) while the pressure varied from 0 to 34 bar. The results indicated a considerable rise in the H2 adsorption capacity of A-MWCNTs (85%), due possibly to the high surface area and enhanced micro-pore volume and the defects formed on the surface sites of MWCNTs by KOH activation. In this case, hydrogen molecules adsorption on the defective cavities could have a significant role through van der walls forces. Therefore, it can be concluded that KOH-modified MWCNTs is one of the most significant ways of developing the textural characteristic and improving hydrogen storage properly.