Ionic Liquid Structure Dependent Electrical Double Layer at the Mercury Interface

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

doi:10.1021/jp7098043

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Ionic Liquid Structure Dependent Electrical Double Layer at the Mercury Interface

Journal article

Peer reviewed

Ionic Liquid Structure Dependent Electrical Double Layer at the Mercury Interface

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

Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.112(7), pp.2601-2606

2008

DOI: https://doi.org/10.1021/jp7098043

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Abstract

Structures of the electrical double layer at Hg|room-temperature ionic liquid (RTIL) interfaces were studied by measuring the differential capacitance and electrocapillary curves as a function of potential. Maxima of the electrocapillary curves measured at the Hg|1-hexyl-3-methylimidazolium tetrafluoroborate (HMIBF4) and 1-octyl-3-methylimidazolium tetrafluoroborate (OMIBF4) interfaces demonstrate an unusual broadness on the anodic side of the potential of zero charge (PZC), which is significantly different from those obtained at Hg in RTILs containing shorter alkyl chains or in conventional molecular solvents containing electrolytes. This broadness of the electrocapillary curve was found to depend on the crystal structure and spatial heterogeneity of the RTILs containing larger alkyl groups, which impede the charged moieties from being in contact with the electrode surface within a certain potential range. Cleaving of the liquid crystal structure by the dilution of OMIBF4 with dimethyl sulfoxide, which is reflected on the electrocapillary and surface charge density versus potential curves, supports the above reasoning. This is the first report on the dependence of the interfacial structure at the Hg electrode on the structure of the RTIL itself. A schematic model of the structure of the electrical double layer is also given.

Details

Title: Ionic Liquid Structure Dependent Electrical Double Layer at the Mercury Interface
Authors: Muhammad Tanzirul Alam (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.112(7), pp.2601-2606
Publisher: American Chemical Society
Date published: 2008
DOI: 10.1021/jp7098043
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: 99450493402621
Output Type: Journal article

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