Boosting operating voltage of vanadium oxide-based symmetric aqueous supercapacitor to 2 V

Boosting operating voltage of vanadium oxide-based symmetric aqueous supercapacitor to 2 V

[Display omitted] •FC NWA substrate fabrication as a 3D conductive carbon scaffold.•Electrochemical growth of vanadium oxide nanowires on FC NWA substrate.•Enlarged charge storage window for the composite through vanadium valence tuning.•The assembled symmetric supercapacitor works with a high volta...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2019-02, Vol.358, p.1529-1538
Main Authors: Huang, Zi-Hang, Song, Yu, Liu, Xiao-Xia
Format: Article
Language:eng
Subjects:
Carbon nanowire array
High operating voltage
Symmetric supercapacitor
Valence tuning
Vanadium oxide
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Summary:[Display omitted] •FC NWA substrate fabrication as a 3D conductive carbon scaffold.•Electrochemical growth of vanadium oxide nanowires on FC NWA substrate.•Enlarged charge storage window for the composite through vanadium valence tuning.•The assembled symmetric supercapacitor works with a high voltage of 2 V. Vanadium oxides have great potentials in high voltage symmetric supercapacitors, benefiting from the available multiple oxidation states of vanadium. In this work, charge storage in a wide potential window of −1.1 to 0.9 V vs. SCE is achieve for vanadium oxide through vanadium valence tuning and incorporation in functionalized carbon nanowire array. The functionalized carbon nanowire array provides a good three dimensional conductive scaffold for the oxide nanowires, leading to high electron and ion transportation for the pseudo-capacitive materials. A high areal capacitance of 1.31 F cm−2 is achieved for the obtained vanadium oxide electrode (at 1 mA cm−2 in 5 M LiCl aqueous solution). It also displays good rate capability, demonstrating a quite high areal capacitance of 687 mF cm−2 at 100 mA cm−2. The assembled symmetric supercapacitor can be operate with a large voltage of 2 V and so can deliver a high volumetric energy density of 3.61 mWh cm−3 at 0.01 W cm−3. The supercapacitor also shows good stability, it can retain 91% of its capacitance after 10 000 galvanostatic charge-discharge cycles.
ISSN:1385-8947
1873-3212