Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 39, Pages 26019-26029Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b08037
Keywords
NiO nanoribbons; SnO2/MnO2 nanoflakes; hydrothermal method; metal oxides; asymmetric supercapacitor device
Funding
- National Natural Science Foundation of China [21273058, 21673064]
- China postdoctoral science foundation [2012M520731]
- Heilongjiang [LBH-Z12089]
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Metal oxides have attracted renewed interest in applications as energy storage and conversion devices. Here, a new design is reported to acquire an asymmetric supercapacitor assembled by all free-standing metal oxides. The positive electrode is made of 3D NiO open porous nanoribbons network on nickel foam and the negative electrode is composed of SnO2/MnO2 nanoflakes grown on carbon cloth (CC) substrate. The combination of two metal oxide electrodes which replaced the traditional group of carbon materials together with metal oxide has achieved a higher energy density. The self-supported 3D NiO nanoribbons network demonstrates a high specific capacitance and better cycle performance without obvious mechanical deformation despite of undergoing harsh bulk redox reactions. The SnO2/MnO2 nanoflakes as the pseudocapacitive electrode exhibit a wide range of voltage window (-1 to 1 V), which is conducive to electrochemical energy storage. The (CC/SnO2/MnO2)(-)//(NiO/Ni foam)(+) asymmetric supercapacitor device delivers an energy density of 64.4 Wh kg(-1) (at a power density of 250 W kg(-1)) and two devices in series are applied to light up 24 red LEDs for about 60 s. The outstanding electrochemical properties of the device hold great promise for long-life, high-energy, and high-power energy storage/conversion applications.
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