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A VO2 based hybrid super-capacitor utilizing a highly concentrated aqueous electrolyte for increased potential window and capacity
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- Lindberg, Simon, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Maty Ndiaye, Ndeye (author)
- Universiteit van Pretoria,University of Pretoria
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- Manyala, Ncholu (author)
- Universiteit van Pretoria,University of Pretoria
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- Elsevier BV, 2020
- 2020
- English.
- In: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 345
- Journal article (peer-reviewed)
Abstract
Subject headings
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- In this work we demonstrate the application of a highly concentrated aqueous electrolyte to a hybrid supercapacitor cell. We combine an 8 m Sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) aqueous electrolyte with a nanostructured VO2-cathode to enhance the voltage widow up to 2.4 V in a full cell. With the enhanced potential window, we are able to exploit the full contribution of the VO2 material, where a part is outside the stability window of standard alkaline aqueous electrolytes. We show that the VO2 material in the highly concentrated electrolyte provides a faradaic contribution even at the highest current density (25 A/g) and in this way increases the energy content also in high power conditions. The full cell shows a good efficiency but also a capacity fade over 500 cycles (39%) which is most likely related to dissolution of VO2.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Highly concentrated electrolyte
- NaTFSI
- Supercapacitor
- Stability
- VO2
Publication and Content Type
- art (subject category)
- ref (subject category)
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