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Title: In Situ Probing of Ion Ordering at an Electrified Ionic Liquid/Au Interface

Journal Article · · Advanced Materials
 [1];  [1];  [2];  [3]; ORCiD logo [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department
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Charge transport at the interface of electrodes and ionic liquids is critical for the use of the latter as electrolytes. In this study, a room-temperature ionic liquid, 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide (EMMIM TFSI), is investigated in situ under applied bias voltage with a novel method using low-energy electron and photoemission electron microscopy. Changes in photoelectron yield as a function of bias applied to electrodes provide a direct measure of the dynamics of ion reconfiguration and electrostatic responses of the EMMIM TFSI. Finally, long-range and correlated ionic reconfigurations that occur near the electrodes are found to be a function of temperature and thickness, which, in turn, relate to ionic mobility and different configurations for out-of-plane ordering near the electrode interfaces, with a critical transition in ion mobility for films thicker than three monolayers.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1376095
Report Number(s):
BNL--113908-2017-JA; KC0403020
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 27 Vol. 29; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Charge reduction in ions in the ionic liquid 1-ethy-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide on the Au(111) surface journal January 2020
Boronic ester-based dynamic covalent ionic liquid gels for self-healable, recyclable and malleable optical devices journal January 2018
Electrical field facilitates selective transport of CO 2 through a laminated MoS 2 supported ionic liquid membrane journal January 2019
Selectively tuning gas transport through ionic liquid filled graphene oxide nanoslits using an electric field journal January 2019

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Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
electric double layers
ionic liquids
photoemission electron microscopy