期刊
APPLIED SURFACE SCIENCE
卷 459, 期 -, 页码 430-437出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.07.147
关键词
Ultrathin MnO2 nanoflakes; Electrochemical deposition; Neutral aqueous supercapacitors; Enlarged working potential window; Long cycle stability
类别
资金
- National Key Research and Development Program of China [2016YFA0202400]
- National Key Basic Research Program of China (973 Program) [2015CB932201]
- National Natural Science Foundation of China [51572080, 51772095, 51702096]
Manganese oxide (MnO2) has been comprehensively studied as one high-voltage electrode material in the neutral aqueous supercapacitors, whereas the working potential window (WPW) for the device hasn't exceeded 2.0 V in most reports. Here, interlaced ultrathin MnO2 nanoflakes were vertically aligned on the carbon cloth (CC) via a facial potentiostatic electrochemical deposition method. A stable WPW for the MnO2/CC electrodes in three electrolytes of 0.5 M A(2)SO(4) (A = Li, Na, K) was defined as 0-1.1 V, which was attributed to the nanoporous morphology of the MnO2 nanosheets and high content of structure water within it. Furthermore, the MnO2 nanoflakes with 0.5 M Na2SO4 have achieved a high specific capacitance of 272.2 F/g at 2 mV/s, and the retention of the performance was 83.8% (5 A/g) after 5000 cycling tests. As for the flexible asymmetric MnO2 supercapacitors (FAMSC), the MnO2/CC electrode was used as a cathode and a self-assembled rGO film was developed as an anode. Working in an extended WPW of 0-2.2 V, the FASMC exhibited a large energy density of 49.8 Wh/kg and the retention of the performance was 88.7% at 5 A/g after 5000 cycles. This work provides a stable WPW for the MnO2 electrodes, which may promote further development of the high-voltage neutral aqueous supercapacitors.
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