Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 12, Issue 7, Pages 6058-6064Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2012.6283
Keywords
Activated Carbon Aerogel; Manganese Oxide; Pseudocapacitance; Supercapacitor
Categories
Funding
- Global Frontier R&D Program on Center for Multiscale Energy System
- National Research Foundation under the Ministry of Education, Science and Technology, Korea
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Carbon aerogel (CA) was prepared by a sol gel polymerization of resorcinol and formaldehyde, and a series of activated carbon aerogels (ACA-KOH-X, X = 0, 0.3, 0.7, 1, and 2) were then prepared by a chemical activation using different amount of potassium hydroxide (X represented weight ratio of KOH with respect to CA). Specific capacitances of activated carbon aerogels were measured by cyclic voltammetry and galvanostatic charge/discharge methods in 6 M KOH electrolyte. Among the samples prepared, ACA-KOH-0.7 showed the highest specific capacitance (149 F/g). In order to combine excellent electrochemical performance of activated carbon aerogel with pseudocapacitive property of manganese oxide, 7 wt% Mn was doped on activated carbon aerogel (Mn/ACA-KOH-0.7) by an incipient wetness impregnation method. For comparison, 7 wt% Mn was also impregnated on carbon aerogel (Mn/ACA-KOH-0) by the same method. It was revealed that 7 wt% Mn-doped activated carbon aerogel (Mn/ACA-KOH-0.7) showed higher specific capacitance than 7 wt% Mn-doped carbon aerogel (Mn/ACA-KOH-0) (178 F/g vs. 98 F/g). The enhanced capacitance of Mn/ACA-KOH-0.7 was attributed to the outstanding electric properties of activated carbon aerogel as well as the faradaic redox reactions of manganese oxide.
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