Near-Ambient Pressure XPS and NEXAFS Study of a Superbasic Ionic Liquid with CO2

Jordan Cole; Zoë Henderson; Andrew G. Thomas; Claudia L. Compeán-gonzález; Adam J. Greer; Christopher Hardacre; Federica Venturini; Wilson Quevedo Garzon; Pilar Ferrer; David C. Grinter; Georg Held; Karen L. Syres

doi:10.1021/acs.jpcc.1c05738

Near-Ambient Pressure XPS and NEXAFS Study of a Superbasic Ionic Liquid with CO2

Jordan Cole, Zoë Henderson, Andrew G. Thomas, Claudia L. Compeán-gonzález, Adam J. Greer, Christopher Hardacre, Federica Venturini, Wilson Quevedo Garzon, Pilar Ferrer, David C. Grinter, Georg Held, Karen L. Syres

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Abstract

In situ photoemission and near edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the interaction of CO2 with an ionic liquid thin film. A thin film of the superbasic ionic liquid (SBIL) trihexyltetradecylphosphonium benzimidazolide ([P66614][benzim]) was prepared on a rutile TiO2 (110) surface and exposed to CO2 at near-ambient pressures.
NEXAFS measurements combined with density functional theory calculations indicate a realignment of [benzim]- anions from 27° from the surface normal to 54° upon exposure to CO2. Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) shows evidence of irreversible CO2 absorption in thin films of [P66614][benzim] and a greater concentration of CO2-reacted anions in the deeper layers. These results give a new perspective on CO2 uptake in ionic liquids and fundamental interactions at the liquid-gas interface. Understanding this interfacial behaviour is important for developing ILs for gas capture applications and may influence the performance of other IL-based technologies.

Original language	English
Journal	The Journal of Physical Chemistry C
Early online date	12 Oct 2021
DOIs	https://doi.org/10.1021/acs.jpcc.1c05738
Publication status	Published - 21 Oct 2021

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Cole, J., Henderson, Z., Thomas, A. G., Compeán-gonzález, C. L., Greer, A. J., Hardacre, C., Venturini, F., Garzon, W. Q., Ferrer, P., Grinter, D. C., Held, G., & Syres, K. L. (2021). Near-Ambient Pressure XPS and NEXAFS Study of a Superbasic Ionic Liquid with CO2. The Journal of Physical Chemistry C. Advance online publication. https://doi.org/10.1021/acs.jpcc.1c05738

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title = "Near-Ambient Pressure XPS and NEXAFS Study of a Superbasic Ionic Liquid with CO2",

abstract = "In situ photoemission and near edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the interaction of CO2 with an ionic liquid thin film. A thin film of the superbasic ionic liquid (SBIL) trihexyltetradecylphosphonium benzimidazolide ([P66614][benzim]) was prepared on a rutile TiO2 (110) surface and exposed to CO2 at near-ambient pressures. NEXAFS measurements combined with density functional theory calculations indicate a realignment of [benzim]- anions from 27° from the surface normal to 54° upon exposure to CO2. Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) shows evidence of irreversible CO2 absorption in thin films of [P66614][benzim] and a greater concentration of CO2-reacted anions in the deeper layers. These results give a new perspective on CO2 uptake in ionic liquids and fundamental interactions at the liquid-gas interface. Understanding this interfacial behaviour is important for developing ILs for gas capture applications and may influence the performance of other IL-based technologies.",

author = "Jordan Cole and Zo{\"e} Henderson and Thomas, {Andrew G.} and Compe{\'a}n-gonz{\'a}lez, {Claudia L.} and Greer, {Adam J.} and Christopher Hardacre and Federica Venturini and Garzon, {Wilson Quevedo} and Pilar Ferrer and Grinter, {David C.} and Georg Held and Syres, {Karen L.}",

year = "2021",

month = oct,

day = "21",

doi = "10.1021/acs.jpcc.1c05738",

language = "English",

journal = "The Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

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T1 - Near-Ambient Pressure XPS and NEXAFS Study of a Superbasic Ionic Liquid with CO2

AU - Cole, Jordan

AU - Henderson, Zoë

AU - Thomas, Andrew G.

AU - Compeán-gonzález, Claudia L.

AU - Greer, Adam J.

AU - Hardacre, Christopher

AU - Venturini, Federica

AU - Garzon, Wilson Quevedo

AU - Ferrer, Pilar

AU - Grinter, David C.

AU - Held, Georg

AU - Syres, Karen L.

PY - 2021/10/21

Y1 - 2021/10/21

N2 - In situ photoemission and near edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the interaction of CO2 with an ionic liquid thin film. A thin film of the superbasic ionic liquid (SBIL) trihexyltetradecylphosphonium benzimidazolide ([P66614][benzim]) was prepared on a rutile TiO2 (110) surface and exposed to CO2 at near-ambient pressures. NEXAFS measurements combined with density functional theory calculations indicate a realignment of [benzim]- anions from 27° from the surface normal to 54° upon exposure to CO2. Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) shows evidence of irreversible CO2 absorption in thin films of [P66614][benzim] and a greater concentration of CO2-reacted anions in the deeper layers. These results give a new perspective on CO2 uptake in ionic liquids and fundamental interactions at the liquid-gas interface. Understanding this interfacial behaviour is important for developing ILs for gas capture applications and may influence the performance of other IL-based technologies.

AB - In situ photoemission and near edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the interaction of CO2 with an ionic liquid thin film. A thin film of the superbasic ionic liquid (SBIL) trihexyltetradecylphosphonium benzimidazolide ([P66614][benzim]) was prepared on a rutile TiO2 (110) surface and exposed to CO2 at near-ambient pressures. NEXAFS measurements combined with density functional theory calculations indicate a realignment of [benzim]- anions from 27° from the surface normal to 54° upon exposure to CO2. Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) shows evidence of irreversible CO2 absorption in thin films of [P66614][benzim] and a greater concentration of CO2-reacted anions in the deeper layers. These results give a new perspective on CO2 uptake in ionic liquids and fundamental interactions at the liquid-gas interface. Understanding this interfacial behaviour is important for developing ILs for gas capture applications and may influence the performance of other IL-based technologies.

U2 - 10.1021/acs.jpcc.1c05738

DO - 10.1021/acs.jpcc.1c05738

M3 - Article

SN - 1932-7447

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

ER -

Near-Ambient Pressure XPS and NEXAFS Study of a Superbasic Ionic Liquid with CO2

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