A pH dependent high voltage aqueous supercapacitor with dual electrolytes

Soumodip Sur; Alagar Raja Kottaichamy; Zahid Manzoor Bhat; Mruthyunjayachari Chattanahalli Devendrachari; Ravikumar Thimmappa; Musthafa Ottakam Thotiyl

doi:10.1016/j.cplett.2018.10.001

A pH dependent high voltage aqueous supercapacitor with dual electrolytes

Soumodip Sur
, Alagar Raja Kottaichamy
, Zahid Manzoor Bhat
, Mruthyunjayachari Chattanahalli Devendrachari
, Ravikumar Thimmappa
, Musthafa Ottakam Thotiyl^*

^*Corresponding author for this work

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

14 Scopus citations

Abstract

Improving the energy density without compromising the power capability is a classical challenge for electrochemical capacitors. Since energy is quadratically related to voltage by 1/2(Capacitance)(Voltage)² the most beneficial strategy to boost the energy density is to target the working voltage window. However, expanding the voltage window beyond 1.23 V in aqueous system is thermodynamically challenged due to parasitic water splitting reactions. We show that the parasitic chemistry can be arrested by decoupling the direct acid-alkali chemistry, and the voltage window in aqueous supercapacitors can be expanded with energy boosting up to ∼230%.

Original language	English
Pages (from-to)	160-164
Number of pages	5
Journal	Chemical Physics Letters
Volume	712
DOIs	https://doi.org/10.1016/j.cplett.2018.10.001
State	Published - 16 Nov 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

Acid alkali chemistry
Energy density
Supercapacitors
Voltage window
Water splitting reaction

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/j.cplett.2018.10.001

Cite this

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title = "A pH dependent high voltage aqueous supercapacitor with dual electrolytes",

abstract = "Improving the energy density without compromising the power capability is a classical challenge for electrochemical capacitors. Since energy is quadratically related to voltage by 1/2(Capacitance)(Voltage)2 the most beneficial strategy to boost the energy density is to target the working voltage window. However, expanding the voltage window beyond 1.23 V in aqueous system is thermodynamically challenged due to parasitic water splitting reactions. We show that the parasitic chemistry can be arrested by decoupling the direct acid-alkali chemistry, and the voltage window in aqueous supercapacitors can be expanded with energy boosting up to ∼230\%.",

keywords = "Acid alkali chemistry, Energy density, Supercapacitors, Voltage window, Water splitting reaction",

author = "Soumodip Sur and Kottaichamy, \{Alagar Raja\} and \{Manzoor Bhat\}, Zahid and Devendrachari, \{Mruthyunjayachari Chattanahalli\} and Ravikumar Thimmappa and Thotiyl, \{Musthafa Ottakam\}",

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doi = "10.1016/j.cplett.2018.10.001",

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journal = "Chemical Physics Letters",

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T1 - A pH dependent high voltage aqueous supercapacitor with dual electrolytes

AU - Sur, Soumodip

AU - Kottaichamy, Alagar Raja

AU - Manzoor Bhat, Zahid

AU - Devendrachari, Mruthyunjayachari Chattanahalli

AU - Thimmappa, Ravikumar

AU - Thotiyl, Musthafa Ottakam

PY - 2018/11/16

Y1 - 2018/11/16

N2 - Improving the energy density without compromising the power capability is a classical challenge for electrochemical capacitors. Since energy is quadratically related to voltage by 1/2(Capacitance)(Voltage)2 the most beneficial strategy to boost the energy density is to target the working voltage window. However, expanding the voltage window beyond 1.23 V in aqueous system is thermodynamically challenged due to parasitic water splitting reactions. We show that the parasitic chemistry can be arrested by decoupling the direct acid-alkali chemistry, and the voltage window in aqueous supercapacitors can be expanded with energy boosting up to ∼230%.

AB - Improving the energy density without compromising the power capability is a classical challenge for electrochemical capacitors. Since energy is quadratically related to voltage by 1/2(Capacitance)(Voltage)2 the most beneficial strategy to boost the energy density is to target the working voltage window. However, expanding the voltage window beyond 1.23 V in aqueous system is thermodynamically challenged due to parasitic water splitting reactions. We show that the parasitic chemistry can be arrested by decoupling the direct acid-alkali chemistry, and the voltage window in aqueous supercapacitors can be expanded with energy boosting up to ∼230%.

KW - Acid alkali chemistry

KW - Energy density

KW - Supercapacitors

KW - Voltage window

KW - Water splitting reaction

UR - https://www.scopus.com/pages/publications/85054298349

U2 - 10.1016/j.cplett.2018.10.001

DO - 10.1016/j.cplett.2018.10.001

M3 - Article

AN - SCOPUS:85054298349

SN - 0009-2614

VL - 712

SP - 160

EP - 164

JO - Chemical Physics Letters

JF - Chemical Physics Letters

ER -

A pH dependent high voltage aqueous supercapacitor with dual electrolytes

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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