Biredox ionic liquids: New opportunities toward high performance supercapacitors

C. Bodin, E. Mourad, D. Zigah, S. Le Vot, S. A. Freunberger, F. Favier, O. Fontaine

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Nowadays commercial supercapacitors are based on purely capacitive storage at the porous carbons that are used for the electrodes. However, the limits that capacitive storage imposes on energy density calls to investigate new materials to improve the capacitance of the device. This new type of electrodes (e.g., RuO2, MnO2...) involves pseudo-capacitive faradaic redox processes with the solid material. Ion exchange with solid materials is, however, much slower than the adsorption process in capacitive storage and inevitably leads to significant loss of power. Faradaic process in the liquid state, in contrast can be similarly fast as capacitive processes due to the fast ion transport. Designing new devices with liquid like dynamics and improved specific capacitance is challenging. We present a new approach to increase the specific capacitance using biredox ionic liquids, where redox moieties are tethered to the electrolyte ions, allowing high redox concentrations and significant pseudo-capacitive storage in the liquid state. Anions and cations are functionalized with anthraquinone (AQ) and 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) moieties, respectively. Glassy carbon, carbon-onion, and commercial activated carbon electrodes that exhibit different double layer structures and thus different diffusion dynamics were used to simultaneously study the electrochemical response of biredox ionic liquids at the positive and negative electrode.

Original languageEnglish
Pages (from-to)393-404
Number of pages12
JournalFaraday Discussions
Volume206
DOIs
Publication statusPublished - 1 Jan 2018

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Ionic Liquids
electrochemical capacitors
Electrodes
Capacitance
liquids
electrodes
capacitance
Liquids
Carbon
Ions
Anthraquinones
Glassy carbon
anthraquinones
ions
Activated carbon
Electrolytes
carbon
Anions
glassy carbon
Cations

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Biredox ionic liquids : New opportunities toward high performance supercapacitors. / Bodin, C.; Mourad, E.; Zigah, D.; Le Vot, S.; Freunberger, S. A.; Favier, F.; Fontaine, O.

In: Faraday Discussions, Vol. 206, 01.01.2018, p. 393-404.

Research output: Contribution to journalArticleResearchpeer-review

Bodin, C, Mourad, E, Zigah, D, Le Vot, S, Freunberger, SA, Favier, F & Fontaine, O 2018, 'Biredox ionic liquids: New opportunities toward high performance supercapacitors' Faraday Discussions, vol. 206, pp. 393-404. https://doi.org/10.1039/c7fd00174f
Bodin, C. ; Mourad, E. ; Zigah, D. ; Le Vot, S. ; Freunberger, S. A. ; Favier, F. ; Fontaine, O. / Biredox ionic liquids : New opportunities toward high performance supercapacitors. In: Faraday Discussions. 2018 ; Vol. 206. pp. 393-404.
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