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Near-ambient pressure XPS and NEXAFS study of a superbasic ionic liquid with CO2
Authors:
Jordan
Cole
(University of Central Lancashire)
,
Zoe
Henderson
(University of Central Lancashire)
,
Andrew G.
Thomas
(University of Manchester)
,
Claudia L.
Compeán-González
(University of Manchester)
,
Adam
Greer
(University of Manchester)
,
Christopher
Hardacre
(University of Manchester)
,
Federica
Venturini
(Diamond Light Source)
,
Wilson
Quevedo Garzon
(Diamond Light Source)
,
Pilar
Ferrer
(Diamond Light Source)
,
David C.
Grinter
(Diamond Light Source)
,
Georg
Held
(Diamond Light Source)
,
Karen L.
Syres
(University of Central Lancashire)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
The Journal Of Physical Chemistry C
State:
Published (Approved)
Published:
October 2021
Diamond Proposal Number(s):
20532
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 behavior is important for developing ILs for gas capture applications and may influence the performance of other IL-based technologies.
Journal Keywords: Salts; X-ray absorption near edge spectroscopy; Thin films; Anions; Solvents
Diamond Keywords: Carbon Capture and Storage (CCS)
Subject Areas:
Physics,
Chemistry
Instruments:
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS
Added On:
14/10/2021 09:18
Discipline Tags:
Surfaces
Earth Sciences & Environment
Physics
Climate Change
Physical Chemistry
Chemistry
interfaces and thin films
Technical Tags:
Spectroscopy
X-ray Absorption Spectroscopy (XAS)
X-ray Photoelectron Spectroscopy (XPS)
Near Edge X-ray Absorption Fine Structures (NEXAFS)
Near Ambient Pressure XPS (NAP-XPS)