Journal
NEW CARBON MATERIALS
Volume 33, Issue 5, Pages 402-408Publisher
ELSEVIER
DOI: 10.1016/S1872-5805(18)60348-8
Keywords
Corncob; Hydrothermal method; Ammonium chloride; Activated carbon; Electrochemical performance
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Funding
- National Natural Science Foundation of China [51502108]
- Foundation of Jilin Provence Development and Reform Commission [2014N145]
- Development Project of Science and Technology of Jilin Province [20150520016JH]
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Activated carbons were prepared from corncobs by an initial hydrothermal treatment using ammonium chloride as a pore forming additive and then by KOH activation. Samples were characterized by SEM, XRD, TG analysis and nitrogen adsorption. The effects of preparation conditions on the iodine number, yield and their electrochemical performance as supercapacitor electrodes were investigated. Results indicate that NH4Cl is helpful for the formation of activated carbons with a hierarchical pore structure. The best activated carbon prepared has a good rate performance with a capacitance of 175 F . g(-1) at 0.5 A . g(-1) and a capacity retention ratio of 73.0% at 20 A . g(-1), and a good cycling stability with a specific capacity change from 175 to 173 F . g(-1) after a 10 000 charge/discharge test.
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