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NMR study of ion dynamics and charge storage in ionic liquid supercapacitors

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NMR study of ion dynamics and charge storage in ionic liquid supercapacitors. / Forse, Alexander C.; Griffin, John M.; Merlet, Celine et al.

In: Journal of the American Chemical Society, Vol. 137, No. 22, 10.06.2015, p. 7231-7242.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Forse, AC, Griffin, JM, Merlet, C, Bayley, PM, Wang, H, Simon, P & Grey, CP 2015, 'NMR study of ion dynamics and charge storage in ionic liquid supercapacitors', Journal of the American Chemical Society, vol. 137, no. 22, pp. 7231-7242. https://doi.org/10.1021/jacs.5b03958

APA

Forse, A. C., Griffin, J. M., Merlet, C., Bayley, P. M., Wang, H., Simon, P., & Grey, C. P. (2015). NMR study of ion dynamics and charge storage in ionic liquid supercapacitors. Journal of the American Chemical Society, 137(22), 7231-7242. https://doi.org/10.1021/jacs.5b03958

Vancouver

Forse AC, Griffin JM, Merlet C, Bayley PM, Wang H, Simon P et al. NMR study of ion dynamics and charge storage in ionic liquid supercapacitors. Journal of the American Chemical Society. 2015 Jun 10;137(22):7231-7242. Epub 2015 May 14. doi: 10.1021/jacs.5b03958

Author

Forse, Alexander C. ; Griffin, John M. ; Merlet, Celine et al. / NMR study of ion dynamics and charge storage in ionic liquid supercapacitors. In: Journal of the American Chemical Society. 2015 ; Vol. 137, No. 22. pp. 7231-7242.

Bibtex

@article{aec2118e7ccc4f799de688c156b01b60,
title = "NMR study of ion dynamics and charge storage in ionic liquid supercapacitors",
abstract = "Ionic liquids are emerging as promising new electrolytes for supercapacitors. While their higher operating voltages allow the storage of more energy than organic electrolytes, they cannot currently compete in terms of power performance. More fundamental studies of the mechanism and dynamics of charge storage are required to facilitate the development and application of these materials. Here we demonstrate the application of nuclear magnetic resonance spectroscopy to study the structure and dynamics of ionic liquids confined in porous carbon electrodes. The measurements reveal that ionic liquids spontaneously wet the carbon micropores in the absence of any applied potential and that on application of a potential supercapacitor charging takes place by adsorption of counterions and desorption of co-ions from the pores. We find that adsorption and desorption of anions surprisingly plays a more dominant role than that of the cations. Having elucidated the charging mechanism, we go on to study the factors that affect the rate of ionic diffusion in the carbon micropores in an effort to understand supercapacitor charging dynamics. We show that the line shape of the resonance arising from adsorbed ions is a sensitive probe of their effective diffusion rate, which is found to depend on the ionic liquid studied, as well as the presence of any solvent additives. Taken as whole, our NMR measurements allow us to rationalize the power performances of different electrolytes in supercapacitors.",
keywords = "SOLID-STATE NMR, ELECTRICAL DOUBLE-LAYER, INDEPENDENT CHEMICAL-SHIFT, ANGLE-SPINNING NMR, ACTIVATED CARBON, IN-SITU, MAGNETIC-RESONANCE, ENERGY-STORAGE, DEGREES-C, ELECTROLYTE",
author = "Forse, {Alexander C.} and Griffin, {John M.} and Celine Merlet and Bayley, {Paul M.} and Hao Wang and Patrice Simon and Grey, {Clare P.}",
year = "2015",
month = jun,
day = "10",
doi = "10.1021/jacs.5b03958",
language = "English",
volume = "137",
pages = "7231--7242",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "AMER CHEMICAL SOC",
number = "22",

}

RIS

TY - JOUR

T1 - NMR study of ion dynamics and charge storage in ionic liquid supercapacitors

AU - Forse, Alexander C.

AU - Griffin, John M.

AU - Merlet, Celine

AU - Bayley, Paul M.

AU - Wang, Hao

AU - Simon, Patrice

AU - Grey, Clare P.

PY - 2015/6/10

Y1 - 2015/6/10

N2 - Ionic liquids are emerging as promising new electrolytes for supercapacitors. While their higher operating voltages allow the storage of more energy than organic electrolytes, they cannot currently compete in terms of power performance. More fundamental studies of the mechanism and dynamics of charge storage are required to facilitate the development and application of these materials. Here we demonstrate the application of nuclear magnetic resonance spectroscopy to study the structure and dynamics of ionic liquids confined in porous carbon electrodes. The measurements reveal that ionic liquids spontaneously wet the carbon micropores in the absence of any applied potential and that on application of a potential supercapacitor charging takes place by adsorption of counterions and desorption of co-ions from the pores. We find that adsorption and desorption of anions surprisingly plays a more dominant role than that of the cations. Having elucidated the charging mechanism, we go on to study the factors that affect the rate of ionic diffusion in the carbon micropores in an effort to understand supercapacitor charging dynamics. We show that the line shape of the resonance arising from adsorbed ions is a sensitive probe of their effective diffusion rate, which is found to depend on the ionic liquid studied, as well as the presence of any solvent additives. Taken as whole, our NMR measurements allow us to rationalize the power performances of different electrolytes in supercapacitors.

AB - Ionic liquids are emerging as promising new electrolytes for supercapacitors. While their higher operating voltages allow the storage of more energy than organic electrolytes, they cannot currently compete in terms of power performance. More fundamental studies of the mechanism and dynamics of charge storage are required to facilitate the development and application of these materials. Here we demonstrate the application of nuclear magnetic resonance spectroscopy to study the structure and dynamics of ionic liquids confined in porous carbon electrodes. The measurements reveal that ionic liquids spontaneously wet the carbon micropores in the absence of any applied potential and that on application of a potential supercapacitor charging takes place by adsorption of counterions and desorption of co-ions from the pores. We find that adsorption and desorption of anions surprisingly plays a more dominant role than that of the cations. Having elucidated the charging mechanism, we go on to study the factors that affect the rate of ionic diffusion in the carbon micropores in an effort to understand supercapacitor charging dynamics. We show that the line shape of the resonance arising from adsorbed ions is a sensitive probe of their effective diffusion rate, which is found to depend on the ionic liquid studied, as well as the presence of any solvent additives. Taken as whole, our NMR measurements allow us to rationalize the power performances of different electrolytes in supercapacitors.

KW - SOLID-STATE NMR

KW - ELECTRICAL DOUBLE-LAYER

KW - INDEPENDENT CHEMICAL-SHIFT

KW - ANGLE-SPINNING NMR

KW - ACTIVATED CARBON

KW - IN-SITU

KW - MAGNETIC-RESONANCE

KW - ENERGY-STORAGE

KW - DEGREES-C

KW - ELECTROLYTE

U2 - 10.1021/jacs.5b03958

DO - 10.1021/jacs.5b03958

M3 - Journal article

VL - 137

SP - 7231

EP - 7242

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 22

ER -