Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 7, Pages 3641-3648Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00092
Keywords
Macroporous carbon; Manganese oxide nanosheets; Areal specific capacitance; Supercapacitor
Categories
Funding
- National Basic Research Program of China [2012CB933003]
- National Natural Science Foundation of China [51272057]
- Shenzhen Basic Research Program [JCYJ20130329150737027]
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Supercapacitor performance is strongly dependent on the utilization rate of electrode materials. In this paper, MnO2 nanosheets (MONSs) have been grown on the inner surface of macroporous carbon (MPC) for increasing the utilization rate. The MPC is prepared from luffa sponge fibers. The MPC possesses closely arranged straight channels at the micrometer scale, which makes the MONSs be able to grow on the inner surface. Because of sufficient exposure toward electrolyte, the MONSs exhibit high mass specific capacitance at different loadings such as 1332 F/g (150 mu g/cm(2)) and 354 F/g (5690 mu g/cm(2)). Because of the presence of the large pores allowing the electrolyte solution to access easily, the active materials are capable of working at high loadings, obtaining areal specific capacitance as high as 2.9 F/cm(2). The assembled Supercapacitors show a high specific energy of 194 mu Wh/cm(2) at the specific power of 4.5 mW/cm(2). As the luffa sponge is abundant and pollution-free in production, the MONSs/MPC is of high promise for supercapacitor application. The present method to grow the active materials on an inner surface to increase the utilization rate is also valuable for other applications, e.g., catalysis, and Li-ion batteries.
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