Journal
JOURNAL OF CHEMICAL SCIENCES
Volume 132, Issue 1, Pages -Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12039-019-1695-5
Keywords
MnO2; hydrothermal method; nitrogen-doped activated carbon; asymmetric supercapacitor
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Funding
- National Natural Science Foundation of China [21206139]
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Asymmetric supercapacitors have potential applications in renewable-energy technology owing to their remarkable electrochemical properties. A high-voltage asymmetric supercapacitor was developed based on a core-shell-structured MnO2@carbon sphere composite (MnO2@CS) as the cathode, nitrogen-doped activated carbon as the anode and a neutral aqueous Na2SO4 solution as the electrolyte. MnO2@CS was successfully fabricated by hydrothermally growing MnO2 on the surface of carbon spheres. A nitrogen-containing benzoxazine resin was adopted as a precursor to produce in situ nitrogen-doped activated carbon. Such an aqueous electrolyte-based asymmetric supercapacitor can be cycled reversibly in the high-voltage region of 0-1.9 V and exhibits a superior energy density of 8 Wh kg(-1) at an ultrahigh power density of 9627 W kg(-1) owing to the matching of MnO2@CS and porous nitrogen-doped activated carbon. Moreover, the asymmetric supercapacitor presents acceptable cycling performance, with 74.4% retention after 1000 cycles at 1 A g(-1), and a charge-discharge efficiency of the electrode of almost 100%.
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