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Redox enhanced ener...
Redox enhanced energy storage in an aqueous high-voltage electrochemical capacitor with a potassium bromide electrolyte
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- Li, Qi, 1990 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Haque, Mohammad Mazharul, 1984 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Kuzmenko, Volodymyr, 1987 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa fler...
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- Ramani, Namrata (författare)
- University of California
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- Lundgren, Per, 1968 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Smith, Anderson David, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Enoksson, Peter, 1957 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2017
- 2017
- Engelska.
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Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753. ; 348, s. 219-228
- Relaterad länk:
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- This paper reports a detailed electrochemical investigation of a symmetric carbon-carbon electrochemical device with a potassium bromide (KBr) electrolyte. Below 1.6 V, KBr gives electrochemical double layer behavior. At higher voltages the Br-/Br-3 redox reaction comes into effect and enhances the energy storage. The redox-enhanced device has a high energy density, excellent stability, as well as high coulombic and energy efficiencies even at 1.9 V. More importantly, the redox contribution can be “triggered” by pre-cycling at 1.9 V, and remains beneficial after switching to 1.6 V. The triggering operation leads to a 22% increase in stored energy with negligible sacrifice of power. The intriguing behavior is accompanied by a series of complex variations including the shifts of electrode potential limits and the shift of potential of zero voltage. The electro-oxidation of the positive electrode and kinetics of the Br-/Br-3 electrode reactions are proposed to be the main causes for the triggering phenomenon. These findings provide means to improve the design and operation of devices that contain bromine, or other redox species with a comparably high electrode potential.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Nyckelord
- redox electrolyte
- aqueous supercapacitor
- electrode potential
- high voltage
- Redox-EDLC
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- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Li, Qi, 1990
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Haque, Mohammad ...
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Kuzmenko, Volody ...
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Ramani, Namrata
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Lundgren, Per, 1 ...
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Smith, Anderson ...
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visa fler...
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Enoksson, Peter, ...
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Materialkemi
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Elektroteknik oc ...
- Artiklar i publikationen
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Journal of Power ...
- Av lärosätet
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Chalmers tekniska högskola