Nonlinear Phenomena at Mercury Hg Electrode/Room-Temperature Ionic Liquid (RTIL) Interfaces:  Polarographic Streaming Maxima and Current Oscillation

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

doi:10.1021/jp075749b

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Nonlinear Phenomena at Mercury Hg Electrode/Room-Temperature Ionic Liquid (RTIL) Interfaces: Polarographic Streaming Maxima and Current Oscillation

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Nonlinear Phenomena at Mercury Hg Electrode/Room-Temperature Ionic Liquid (RTIL) Interfaces: Polarographic Streaming Maxima and Current Oscillation

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

Journal of Physical Chemistry Part B, Vol.111(44), pp.12849-12856

2007

DOI: https://doi.org/10.1021/jp075749b

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Abstract

Chemical Sciences

Engineering

Physical Sciences

The polarographic streaming maxima and cyclic voltammetric anodic current oscillation (CVACO) at a hanging mercury drop electrode (HMDE) in room-temperature ionic liquid (RTIL) have been studied for the first time using cyclic voltammetric, potential step chronoamperometric and pulse voltammetric techniques. The reversible redox reaction of the 2,1,3-benzothiadiazole (BTD)/BTD• - (an anion radical of BTD) couple with a formal potential (E0') of -1.36 V versus Ag/AgCl/NaCl(saturated) in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) RTIL was typically employed for this purpose. A maximum was observed at the rising part of the normal pulse voltammogram for the reduction of BTD to BTD• - as well as of the reversed pulse voltammogram for the reoxidation of BTD• - to BTD at the HMDE. The conditions of the initiation and control of the CVACO at the HMDE in EMIBF4 were extensively investigated. Generally, the CVACO was enhanced by increasing the concentration of BTD at a given potential scan rate (Ï…) and was attenuated by increasing Ï…. An electrocapillary curve was measured using a dropping mercury electrode in EMIBF4, and the potential of zero charge was determined to be -0.23 V. On the basis of the modern theory of the polarographic streaming maxima of the first kind, the observed streaming maxima and CVACO phenomena are successfully explained to originate from the macroscopic instability at the electrode/solution interface wherein the oscillating mode creates the CVACO.

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Title: Nonlinear Phenomena at Mercury Hg Electrode/Room-Temperature Ionic Liquid (RTIL) Interfaces: Polarographic Streaming Maxima and Current Oscillation
Authors: Md Mominul Islam (Author) - Tokyo Institute of Technology, Japan
Muhammad Tanzirul Alam (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 B, Vol.111(44), pp.12849-12856
Publisher: American Chemical Society
Date published: 2007
DOI: 10.1021/jp075749b
ISSN: 1520-6106
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: 99450028202621
Output Type: Journal article

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