Fabrication of high performance flexible all-solid-state asymmetric supercapacitors with a three dimensional disc-like WO 3 /stainless steel electrode

Presently, significant attention has been paid towards the rational synthesis of nanostructured anode and cathode electrode materials for assembling high-performance supercapacitors. Despite significant progress being achieved in designing cathode electrode materials, anode electrode materials with...

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Bibliographic Details
Published in:RSC advances 2016, Vol.6 (114), p.113442-113451
Main Authors: Shinde, Pragati A., Chodankar, Nilesh R., Lokhande, Vaibhav C., Patil, Amar M., Ji, Taeksoo, Kim, Jin H., Lokhande, Chandrakant D.
Format: Article
Language:English
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Summary:Presently, significant attention has been paid towards the rational synthesis of nanostructured anode and cathode electrode materials for assembling high-performance supercapacitors. Despite significant progress being achieved in designing cathode electrode materials, anode electrode materials with high capacitance are hardly investigated. In the present article, a tungsten oxide (WO 3 ) thin film is prepared on a flexible stainless steel substrate by a wet chemical method and used as an anode electrode to fabricate a flexible asymmetric supercapacitor (ASC). An electrochemical investigation of the WO 3 thin film shows a maximum specific capacitance of 530 F g −1 at 1 mA cm −2 in a potential window of 0 to −0.8 V in 1 M Na 2 SO 4 electrolyte. In addition, a highly energetic, flexible ASC device is assembled using a WO 3 thin film as an anode, a MnO 2 thin film as a cathode and polymer gel as an electrolyte. The as-assembled MnO 2 //WO 3 ASC device exhibited a stable electrochemical potential window of 1.8 V and better cycling stability. What's more, the flexible MnO 2 //WO 3 ASC device achieves a high specific capacitance of 115 F g −1 with an acceptable specific energy of 52 W h kg −1 at a current density of 3 mA. Hence, the proposed flexible MnO 2 //WO 3 ASC device creates one more option for anode materials to develop flexible energy storage devices.
ISSN:2046-2069
2046-2069
DOI:10.1039/C6RA22181E