Measurements of Differential Capacitance at Mercury/Room-Temperature Ionic Liquids Interfaces

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

doi:10.1021/jp075808l

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Measurements of Differential Capacitance at Mercury/Room-Temperature Ionic Liquids Interfaces

Journal article

Peer reviewed

Measurements of Differential Capacitance at Mercury/Room-Temperature Ionic Liquids Interfaces

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

Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.111(49), pp.18326-18333

2007

DOI: https://doi.org/10.1021/jp075808l

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Abstract

Chemical Sciences

Engineering

Technology

Differential capacitances were measured at Hg/room-temperature ionic liquids (RTILs) interfaces as a function of potential with the aim of getting an insight of their interfacial structures. Capacitance-potential curve measured at Hg in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) resembles well the inner layer capacity at the Hg/aqueous solution interface containing nonspecifically adsorbing electrolyte. In both cases, the hump decreases with an increase in temperature which is discussed in the light of the previous theory. Both the alkyl group and the charged moiety of the cation of 1-alkyl-3-methylimidazolium based RTILs are found to interact concurrently with the Hg surface with the possible change of their orientation in response to the applied potential, and the appearance of a shallow minimum in the capacitance-potential curve related to potential of zero charge (PZC) depends on the extent of their interaction. PZC shifts to the negative direction of potential with increasing the chain length of alkyl residue of the cationic moiety because of the constraint in the orientational change needed for the interaction of positively charged imidazolium ring with Hg surface. Electrocapillary curves were also measured to determine the PZC. Throughout this study, a minimum of the capacitance-potential curve is designated as the PZC in agreement with the maximum of the corresponding electrocapillary curve. Different aspects of the capacitance-potential curves are interpreted satisfactorily on the basis of the hitherto proposed concept of electrical double layer structure.

Details

Title: Measurements of Differential Capacitance at Mercury/Room-Temperature Ionic Liquids Interfaces
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.111(49), pp.18326-18333
Publisher: American Chemical Society
Date published: 2007
DOI: 10.1021/jp075808l
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: 99450481402621
Output Type: Journal article

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