Journal
JOURNAL OF POWER SOURCES
Volume 431, Issue -, Pages 48-54Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2019.05.053
Keywords
Transition metal oxide; Co3O4/MnO2; Asymmetric aqueous supercapatitors; Extra-high voltage; Electrochemistry
Funding
- National Nature Science Foundation of China [51572202]
- National Nature Science Foundation of Jiangsu Province [BK20171234]
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Transition metal oxide-based aqueous supercapacitors rarely possess the ability of high potential windows (1.8-2.4 V), which tremendously restricts the possibility of constructing supercapacitors devices with superior energy density. Therefore, a novel strategy is conceived to synthesize a hierarchical Co3O4/MnO(2 )composite material which broadens the window voltage of the supercapacitors greatly. The MnO2 nanosheets are covered on the surface of Co-MOF-drived Co3O4 nanocages. The morphology and coverage density of MnO2 can be adjusted by the amount of KMnO4. The optimized electrode Co3O4/MnO2-3 exhibits excellent specific capacitance (292 F g(-1) at 4 A g(-1)) and remarkable cycling stability (87.4% retention after 5000 cycles) in 1 M Na2SO4 aqueous electrolyte when the working voltage extends to 1.4 V (vs Ag/AgCl). Furthermore, Asymmetric aqueous supercapacitors assembled with Co3O4/MnO2 as the cathode and activated carbon as the anode displays maximal window voltage of 2.4 V with negligible oxygen evolution reaction, high energy density (46.2 W h kg(-1)) and excellent cycling stability (84.5% capacitance retention after 5000 cycles). The LED is successfully lit by only one device without any other energy assistance.
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