Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 16, Pages 6891-6903Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01155a
Keywords
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Funding
- National Natural Science Foundation of China [U1706225]
- Fundamental Research Funds for the Central Universities [201562026, 201762029]
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The increasing demand for a satisfactory combination of energy-power features in supercapacitors has triggered considerable research efforts dedicated to the development of high-efficiency energy storage devices. In our study, highly cross-linked porous carbon microspheres were prepared via the carbonization of as-prepared polymer spheres followed by a KOH activation process. The resultant products exhibited a high maximum specific surface area (3065.6 m(2) g(-1)), rich nitrogen and oxygen doping (22.3 wt%) and a significant volume fraction of mesopores/macropores (37.91%). The optimal electrode presents the highest specific capacitance of 290 F g(-1) and superior cycling stability with 96% retention after 3000 cycles in an aqueous 2 M KOH electrolyte. Moreover, the assembled asymmetric supercapacitor device based on Co0.9Mn0.1 arrays as the positive electrode achieves a specific capacitance of 105.43 F g(-1) and an energy density of 134.9 W h kg(-1) at a power density of 2879.8 W kg(-1). Interestingly, the device can illuminate an LED for 30 min, demonstrating the promising application potential in high-performance devices related to energy storage.
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