Redox Reaction of 2,2,6,6,-Tetramethylpiperidine-1-oxyl in Lithium Bis(trifluoromethylsulfonyl)amide-tetraglyme Solvate Ionic Liquid

Nobuyuki Serizawa; Kojiro Wada; Naoki Tachikawa; Yasushi Katayama

doi:10.1149/1945-7111/ab77a4

Redox Reaction of 2,2,6,6,-Tetramethylpiperidine-1-oxyl in Lithium Bis(trifluoromethylsulfonyl)amide-tetraglyme Solvate Ionic Liquid

Nobuyuki Serizawa, Kojiro Wada, Naoki Tachikawa, Yasushi Katayama

Department of Applied Chemistry

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

Abstract

The electrode reaction of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was investigated in a solvate ionic liquid composed of lithium bis(trifluoromethylsulfonyl)amide (LiTFSA) and tetraglyme (G4), [Li(G4)]TFSA. A quasi-reversible redox reaction of the oxoammonium (TEMPO⁺) and TEMPO was observed with a formal potential of 0.19 V vs ferrocene|ferrocenium. The diffusion coefficient of TEMPO⁺ (2.1 × 10^-8 cm² s^-1) was smaller than that of neutral TEMPO (1.3 × 10^-7 cm² s^-1), reflecting the coulombic interaction between monovalent TEMPO⁺ and TFSA^- in the solvate ionic liquid. The standard rate constant for TEMPO⁺/TEMPO redox reaction was estimated to be 1.9 × 10^-4 cm s^-1 at 25 C by electrochemical impedance spectroscopy. The solubility of TEMPO in [Li(G4)]TFSA was found to be 4.4 M at 25 C.

Original language	English
Article number	046510
Journal	Journal of the Electrochemical Society
Volume	167
Issue number	4
DOIs	https://doi.org/10.1149/1945-7111/ab77a4
Publication status	Published - 2020 Mar

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Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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title = "Redox Reaction of 2,2,6,6,-Tetramethylpiperidine-1-oxyl in Lithium Bis(trifluoromethylsulfonyl)amide-tetraglyme Solvate Ionic Liquid",

abstract = "The electrode reaction of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was investigated in a solvate ionic liquid composed of lithium bis(trifluoromethylsulfonyl)amide (LiTFSA) and tetraglyme (G4), [Li(G4)]TFSA. A quasi-reversible redox reaction of the oxoammonium (TEMPO+) and TEMPO was observed with a formal potential of 0.19 V vs ferrocene|ferrocenium. The diffusion coefficient of TEMPO+ (2.1 × 10-8 cm2 s-1) was smaller than that of neutral TEMPO (1.3 × 10-7 cm2 s-1), reflecting the coulombic interaction between monovalent TEMPO+ and TFSA- in the solvate ionic liquid. The standard rate constant for TEMPO+/TEMPO redox reaction was estimated to be 1.9 × 10-4 cm s-1 at 25 C by electrochemical impedance spectroscopy. The solubility of TEMPO in [Li(G4)]TFSA was found to be 4.4 M at 25 C.",

author = "Nobuyuki Serizawa and Kojiro Wada and Naoki Tachikawa and Yasushi Katayama",

year = "2020",

month = mar,

doi = "10.1149/1945-7111/ab77a4",

language = "English",

volume = "167",

journal = "Journal of the Electrochemical Society",

issn = "0013-4651",

publisher = "Electrochemical Society, Inc.",

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T1 - Redox Reaction of 2,2,6,6,-Tetramethylpiperidine-1-oxyl in Lithium Bis(trifluoromethylsulfonyl)amide-tetraglyme Solvate Ionic Liquid

AU - Serizawa, Nobuyuki

AU - Wada, Kojiro

AU - Tachikawa, Naoki

AU - Katayama, Yasushi

PY - 2020/3

Y1 - 2020/3

N2 - The electrode reaction of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was investigated in a solvate ionic liquid composed of lithium bis(trifluoromethylsulfonyl)amide (LiTFSA) and tetraglyme (G4), [Li(G4)]TFSA. A quasi-reversible redox reaction of the oxoammonium (TEMPO+) and TEMPO was observed with a formal potential of 0.19 V vs ferrocene|ferrocenium. The diffusion coefficient of TEMPO+ (2.1 × 10-8 cm2 s-1) was smaller than that of neutral TEMPO (1.3 × 10-7 cm2 s-1), reflecting the coulombic interaction between monovalent TEMPO+ and TFSA- in the solvate ionic liquid. The standard rate constant for TEMPO+/TEMPO redox reaction was estimated to be 1.9 × 10-4 cm s-1 at 25 C by electrochemical impedance spectroscopy. The solubility of TEMPO in [Li(G4)]TFSA was found to be 4.4 M at 25 C.

AB - The electrode reaction of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was investigated in a solvate ionic liquid composed of lithium bis(trifluoromethylsulfonyl)amide (LiTFSA) and tetraglyme (G4), [Li(G4)]TFSA. A quasi-reversible redox reaction of the oxoammonium (TEMPO+) and TEMPO was observed with a formal potential of 0.19 V vs ferrocene|ferrocenium. The diffusion coefficient of TEMPO+ (2.1 × 10-8 cm2 s-1) was smaller than that of neutral TEMPO (1.3 × 10-7 cm2 s-1), reflecting the coulombic interaction between monovalent TEMPO+ and TFSA- in the solvate ionic liquid. The standard rate constant for TEMPO+/TEMPO redox reaction was estimated to be 1.9 × 10-4 cm s-1 at 25 C by electrochemical impedance spectroscopy. The solubility of TEMPO in [Li(G4)]TFSA was found to be 4.4 M at 25 C.

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JO - Journal of the Electrochemical Society

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Redox Reaction of 2,2,6,6,-Tetramethylpiperidine-1-oxyl in Lithium Bis(trifluoromethylsulfonyl)amide-tetraglyme Solvate Ionic Liquid

Abstract

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