Pseudocapacitance of MnO2 originates from reversible insertion/desertion of thiocyanate anions studied using in situ X-ray absorption spectroscopy in ionic liquid electrolyte

Ming Tsung Lee; Wen Ta Tsai; Ming Jay Deng; Hui Fang Cheng; I. Wen Sun; Jeng-Kuei Chang

doi:10.1016/j.jpowsour.2009.08.047

Pseudocapacitance of MnO₂ originates from reversible insertion/desertion of thiocyanate anions studied using in situ X-ray absorption spectroscopy in ionic liquid electrolyte

Ming Tsung Lee, Wen Ta Tsai, Ming Jay Deng, Hui Fang Cheng, I. Wen Sun, Jeng-Kuei Chang^*

^*Corresponding author for this work

Department of Materials Science and Engineering

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

35 Scopus citations

Abstract

Charge storage mechanisms of electrodeposited MnO₂ in various aprotic ionic liquids (ILs) are studied using in situ X-ray absorption spectroscopy (XAS). The analytical results show that a unique thiocyanate (SCN^-) anion can reversibly insert/desert into/from the tunnels between the [MnO₆] octahedral subunits depending on the applied potential. This process charge compensates the Mn³⁺/Mn⁴⁺ redox transition upon charging-discharging and thus contributes to an ideal pseudocapacitive behavior of the MnO₂ electrode. The present work would open up a route for developing a novel oxide-based supercapacitor, with high cell-voltage, high thermal stability, and high safety, incorporating IL electrolytes.

Original language	English
Pages (from-to)	919-922
Number of pages	4
Journal	Journal of Power Sources
Volume	195
Issue number	3
DOIs	https://doi.org/10.1016/j.jpowsour.2009.08.047
State	Published - 1 Feb 2010

Keywords

Energy storage
In situ X-ray adsorption spectroscopy (XAS)
Insertion/desertion
Ionic liquid electrolyte
Mn oxide
Pseudocapacitance

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10.1016/j.jpowsour.2009.08.047

Cite this

@article{612a3b18d9014bcbbb8fb49915a152c6,

title = "Pseudocapacitance of MnO2 originates from reversible insertion/desertion of thiocyanate anions studied using in situ X-ray absorption spectroscopy in ionic liquid electrolyte",

abstract = "Charge storage mechanisms of electrodeposited MnO2 in various aprotic ionic liquids (ILs) are studied using in situ X-ray absorption spectroscopy (XAS). The analytical results show that a unique thiocyanate (SCN-) anion can reversibly insert/desert into/from the tunnels between the [MnO6] octahedral subunits depending on the applied potential. This process charge compensates the Mn3+/Mn4+ redox transition upon charging-discharging and thus contributes to an ideal pseudocapacitive behavior of the MnO2 electrode. The present work would open up a route for developing a novel oxide-based supercapacitor, with high cell-voltage, high thermal stability, and high safety, incorporating IL electrolytes.",

keywords = "Energy storage, In situ X-ray adsorption spectroscopy (XAS), Insertion/desertion, Ionic liquid electrolyte, Mn oxide, Pseudocapacitance",

author = "Lee, {Ming Tsung} and Tsai, {Wen Ta} and Deng, {Ming Jay} and Cheng, {Hui Fang} and Sun, {I. Wen} and Jeng-Kuei Chang",

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T1 - Pseudocapacitance of MnO2 originates from reversible insertion/desertion of thiocyanate anions studied using in situ X-ray absorption spectroscopy in ionic liquid electrolyte

AU - Lee, Ming Tsung

AU - Tsai, Wen Ta

AU - Deng, Ming Jay

AU - Cheng, Hui Fang

AU - Sun, I. Wen

AU - Chang, Jeng-Kuei

PY - 2010/2/1

Y1 - 2010/2/1

N2 - Charge storage mechanisms of electrodeposited MnO2 in various aprotic ionic liquids (ILs) are studied using in situ X-ray absorption spectroscopy (XAS). The analytical results show that a unique thiocyanate (SCN-) anion can reversibly insert/desert into/from the tunnels between the [MnO6] octahedral subunits depending on the applied potential. This process charge compensates the Mn3+/Mn4+ redox transition upon charging-discharging and thus contributes to an ideal pseudocapacitive behavior of the MnO2 electrode. The present work would open up a route for developing a novel oxide-based supercapacitor, with high cell-voltage, high thermal stability, and high safety, incorporating IL electrolytes.

AB - Charge storage mechanisms of electrodeposited MnO2 in various aprotic ionic liquids (ILs) are studied using in situ X-ray absorption spectroscopy (XAS). The analytical results show that a unique thiocyanate (SCN-) anion can reversibly insert/desert into/from the tunnels between the [MnO6] octahedral subunits depending on the applied potential. This process charge compensates the Mn3+/Mn4+ redox transition upon charging-discharging and thus contributes to an ideal pseudocapacitive behavior of the MnO2 electrode. The present work would open up a route for developing a novel oxide-based supercapacitor, with high cell-voltage, high thermal stability, and high safety, incorporating IL electrolytes.

KW - Energy storage

KW - In situ X-ray adsorption spectroscopy (XAS)

KW - Insertion/desertion

KW - Ionic liquid electrolyte

KW - Mn oxide

KW - Pseudocapacitance

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