Differential Capacitance at Au(111) in 1-Alkyl-3-methylimidazolium Tetrafluoroborate Based Room-Temperature Ionic Liquids

Muhammad Tanzirul Alam; J Masud; Md Mominul Islam; T Okajima; T Ohsaka

doi:10.1021/jp205800x

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Differential Capacitance at Au(111) in 1-Alkyl-3-methylimidazolium Tetrafluoroborate Based Room-Temperature Ionic Liquids

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Differential Capacitance at Au(111) in 1-Alkyl-3-methylimidazolium Tetrafluoroborate Based Room-Temperature Ionic Liquids

Muhammad Tanzirul Alam, J Masud, Md Mominul Islam, T Okajima and T Ohsaka

Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.115(4), pp.19797-19804

2011

DOI: https://doi.org/10.1021/jp205800x

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Abstract

Engineering

Chemical Sciences

Technology

Interfacial structures at Au(111) electrode in N2-saturated 1-alkyl-3-methylimidazolium tetrafluoroborate room-temperature ionic liquids (RTILs) have been studied by the measurements of differential capacitances and cyclic voltammograms. Capacitance-potential (C-E) curves are found to vary significantly with changing the direction of potential scan and temperature. C-E curves measured by sweeping the potential from negative to positive direction always have lower capacitance values compared to the curves measured by reversing the direction of potential scan, and this difference is larger for the RTIL with longer alkyl group. Special arrangement of the ions at the interface in response to the starting potential, constraint in orientation, and change in the ion electrode and ion-ion interactions are presumed to be the causes for this variation. Temperature has a dramatic effect on the Au(111)|EMIBF4 interface. Capacitance around the potential of zero charge decreases with increasing the temperature at the Au(111)|EMIBF4 interface, whereas at the Au(111)|BMIBF4 and Au(111)|OMIBF4 interfaces, it increases, which is discussed on the basis of the effect of temperature on the so-called solidlike crystallinity of RTILs.

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Title: Differential Capacitance at Au(111) in 1-Alkyl-3-methylimidazolium Tetrafluoroborate Based Room-Temperature Ionic Liquids
Authors: Muhammad Tanzirul Alam (Author) - Tokyo Institute of Technology, Japan
J Masud (Author) - Tokyo Institute of Technology, Japan
Md Mominul Islam (Author) - Tokyo Institute of Technology, Japan
T Okajima (Author) - Tokyo Institute of Technology, Japan
T Ohsaka (Author) - Tokyo Institute of Technology, Japan
Publication details: Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.115(4), pp.19797-19804
Publisher: American Chemical Society
Date published: 2011
DOI: 10.1021/jp205800x
ISSN: 1932-7447
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; National Centre for Timber Durability and Design Life
Language: English
Record Identifier: 99449540802621
Output Type: Journal article

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