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Effects of thermal activation conditions on the microstructure regulation of corncob-derived activated carbon for hydrogen storage
- Source :
- Journal of Energy Chemistry. 23:601-608
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Activated carbons derived from corncob (CACs) were prepared by pyrolysis carbonization and KOH activation. Through modifying activation conditions, samples with large pore volume and ultrahigh BET specific surface area could be obtained. The sample achieved the highest hydrogen uptake capacity of 5.80 wt% at 40 bar and −196 °C. The as-obtained samples were characterized by N 2 -sorption, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Besides, thermogravimetric analysis was also employed to investigate the activation behavior of CACs. Detailed investigation on the activation parameters reveals that moderate activation temperature and heating rate are favorable for preparing CACs with high surface area, large pore volume and optimal pore size distribution. Meanwhile, the micropore volume between 0.65 nm and 0.85 nm along with BET surface area and total pore volume has great effects on hydrogen uptake capacities. The present results indicate that CACs are the most promising materials for hydrogen storage application.
- Subjects :
- Thermogravimetric analysis
Hydrogen
Carbonization
Scanning electron microscope
Energy Engineering and Power Technology
chemistry.chemical_element
Hydrogen storage
Fuel Technology
chemistry
Chemical engineering
Specific surface area
Electrochemistry
medicine
Energy (miscellaneous)
Activated carbon
medicine.drug
BET theory
Subjects
Details
- ISSN :
- 20954956
- Volume :
- 23
- Database :
- OpenAIRE
- Journal :
- Journal of Energy Chemistry
- Accession number :
- edsair.doi...........87170a609963a2f5936a288c698d5d66