Electrical Double-Layer Structure in Ionic Liquids: A Corroboration of the Theoretical Model by Experimental Results

Md Mominul Islam; Muhammad Tanzirul Alam; T Ohsaka

doi:10.1021/jp8058849

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Electrical Double-Layer Structure in Ionic Liquids: A Corroboration of the Theoretical Model by Experimental Results

Journal article

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Electrical Double-Layer Structure in Ionic Liquids: A Corroboration of the Theoretical Model by Experimental Results

Md Mominul Islam, Muhammad Tanzirul Alam and T Ohsaka

Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.112(42), pp.16568-16574

2008

DOI: https://doi.org/10.1021/jp8058849

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Abstract

We experimentally observed for the first time a bell-shaped (convex parabolic) differential capacitance versus potential (Cdl-E) curve, which is expected according to the theory of Kornyshev given for the electrical double layer (EDL) of metal electrode/ionic liquid (IL) interface, at platinum and gold electrodes in four different [quaternary ammonium, imidazolium, and pyrrolidinium cations and bis(trifluoromethanesulfonyl)imide anion-based] ILs with cations and anions of similar sizes. The Cdl-E curves measured at a glassy carbon (nonmetallic) electrode in the same set of ILs were found to be U-shaped, in contrast to those obtained at platinum and gold electrodes. The present study corroborates the so-called Kornyshev's model of the EDL at metal electrode/IL interfaces and at the same time demands a theoretical model for the nonmetallic electrode/IL interface. The EDL formation in ILs is discussed.

Details

Title: Electrical Double-Layer Structure in Ionic Liquids: A Corroboration of the Theoretical Model by Experimental Results
Authors: Md Mominul Islam (Author) - Tokyo Institute of Technology, Japan
Muhammad Tanzirul Alam (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.112(42), pp.16568-16574
Publisher: American Chemical Society
Date published: 2008
DOI: 10.1021/jp8058849
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: 99450370802621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Physical; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology