Measurements of differential capacitance in room temperature ionic liquid at mercury, glassy carbon and gold electrode interfaces

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

doi:10.1016/j.elecom.2007.07.009

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Measurements of differential capacitance in room temperature ionic liquid at mercury, glassy carbon and gold electrode interfaces

Journal article

Peer reviewed

Measurements of differential capacitance in room temperature ionic liquid at mercury, glassy carbon and gold electrode interfaces

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

Electrochemistry Communications, Vol.9(9), pp.2370-2374

2007

DOI: https://doi.org/10.1016/j.elecom.2007.07.009

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Abstract

Chemical Sciences

Engineering

ionic liquid

capacitance

PZC

double layer

hump

Differential capacitances were measured in 1-propyl-3-methylimidazolium tetrafluoroborate (PMIBF4) ionic liquid at three different electrode substrates (Hg, GC (glassy carbon) and Au) as a function of potential. Essentially different capacitance-potential curves were obtained at different electrodes. From the parabolic electrocapillary curve measured at dropping Hg electrode in PMIBF4, the potential of zero charge (PZC) was found to be -0.31 V vs. Ag/AgCl (wire). However, the capacitance-potential curve at Hg electrode was found not to show any valley related to the PZC, whereas at GC and Au electrodes a minimum was observed at 0.29 and -0.51 V, respectively. The results are in disagreement with the recent theoretical study which implies that the capacitance-potential curve should be of bell shape with the maximum value of capacitance at PZC. The parabolic capacitance-potential curve similar to those obtained in inorganic molten salts was also observed for the first time at GC electrode. Probable causes of the difference in their capacitance-potential curves were also discussed.

Details

Title: Measurements of differential capacitance in room temperature ionic liquid at mercury, glassy carbon and gold electrode 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: Electrochemistry Communications, Vol.9(9), pp.2370-2374
Publisher: Elsevier Inc.
Date published: 2007
DOI: 10.1016/j.elecom.2007.07.009
ISSN: 1388-2481
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: 99450278302621
Output Type: Journal article

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