Efficient Charge Storage in Dual-Redox Electrochemical Capacitors through Reversible Counterion-Induced Solid Complexation

Brian Evanko; Seung Joon Yoo; Sang Eun Chun; Xingfeng Wang; Xiulei Ji; Shannon W. Boettcher; Galen D. Stucky

doi:10.1021/jacs.6b05038

Efficient Charge Storage in Dual-Redox Electrochemical Capacitors through Reversible Counterion-Induced Solid Complexation

Brian Evanko, Seung Joon Yoo, Sang Eun Chun, Xingfeng Wang, Xiulei Ji, Shannon W. Boettcher, Galen D. Stucky

Research output: Contribution to journal › Article › peer-review

90 Scopus citations

Abstract

The performance of redox-enhanced electrochemical capacitors (redox ECs) is substantially improved when oxidized catholyte (bromide) and reduced anolyte (viologen) are retained within the porous electrodes through reversible counterion-induced solid complexation. Investigation of the mechanism illustrates design principles and identifies pentyl viologen/bromide (PV/Br) as a new high-performance electrolyte. The symmetric PV/Br redox EC produces a specific energy of 48.5 W·h/kg_dry at 0.5 A/g_dry (0.44 kW/kg_dry) with 99.7% Coulombic efficiency, maintains stability over 10"000 cycles, and functions identically when operated with reversed polarity.

Original language	English
Pages (from-to)	9373-9376
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	138
Issue number	30
DOIs	https://doi.org/10.1021/jacs.6b05038
State	Published - 3 Aug 2016

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title = "Efficient Charge Storage in Dual-Redox Electrochemical Capacitors through Reversible Counterion-Induced Solid Complexation",

abstract = "The performance of redox-enhanced electrochemical capacitors (redox ECs) is substantially improved when oxidized catholyte (bromide) and reduced anolyte (viologen) are retained within the porous electrodes through reversible counterion-induced solid complexation. Investigation of the mechanism illustrates design principles and identifies pentyl viologen/bromide (PV/Br) as a new high-performance electrolyte. The symmetric PV/Br redox EC produces a specific energy of 48.5 W·h/kgdry at 0.5 A/gdry (0.44 kW/kgdry) with 99.7% Coulombic efficiency, maintains stability over 10{"}000 cycles, and functions identically when operated with reversed polarity.",

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AU - Evanko, Brian

AU - Yoo, Seung Joon

AU - Chun, Sang Eun

AU - Wang, Xingfeng

AU - Ji, Xiulei

AU - Boettcher, Shannon W.

AU - Stucky, Galen D.

PY - 2016/8/3

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N2 - The performance of redox-enhanced electrochemical capacitors (redox ECs) is substantially improved when oxidized catholyte (bromide) and reduced anolyte (viologen) are retained within the porous electrodes through reversible counterion-induced solid complexation. Investigation of the mechanism illustrates design principles and identifies pentyl viologen/bromide (PV/Br) as a new high-performance electrolyte. The symmetric PV/Br redox EC produces a specific energy of 48.5 W·h/kgdry at 0.5 A/gdry (0.44 kW/kgdry) with 99.7% Coulombic efficiency, maintains stability over 10"000 cycles, and functions identically when operated with reversed polarity.

AB - The performance of redox-enhanced electrochemical capacitors (redox ECs) is substantially improved when oxidized catholyte (bromide) and reduced anolyte (viologen) are retained within the porous electrodes through reversible counterion-induced solid complexation. Investigation of the mechanism illustrates design principles and identifies pentyl viologen/bromide (PV/Br) as a new high-performance electrolyte. The symmetric PV/Br redox EC produces a specific energy of 48.5 W·h/kgdry at 0.5 A/gdry (0.44 kW/kgdry) with 99.7% Coulombic efficiency, maintains stability over 10"000 cycles, and functions identically when operated with reversed polarity.

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Efficient Charge Storage in Dual-Redox Electrochemical Capacitors through Reversible Counterion-Induced Solid Complexation

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