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Microjet ring electrode (MJRE): Development, modelling and experimental characterisation
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Bitziou, Eleni, Rudd, Nicola C. and Unwin, Patrick R. (2007) Microjet ring electrode (MJRE): Development, modelling and experimental characterisation. Journal of Electroanalytical Chemistry, Vol.602 (No.2). pp. 263-274. doi:10.1016/j.jelechem.2007.01.014 ISSN 0022-0728.
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Official URL: http://dx.doi.org/10.1016/j.jelechem.2007.01.014
Abstract
A novel type of hydrodynamic ultramicroelectrode (UME) is described, which employs a ring UME coupled to a high speed perpendicular impinging microjet. Two types of ring UME have been fabricated, both based on an optical fibre, coated in a thin metal film, which is then sealed using either epoxy resin or glass. After polishing, a thin ring UME (approximate to 300-1000 nm) is obtained. When employed in the impinging microjet system, both UMEs show an increase in mass-transport-limited current with flow rate, for simple redox processes such as the reduction of Ru(NH3)(6)(3+) or methyl viologen dication in aqueous solution. However, the mass-transport rates observed are significantly lower than predicted by solving the Navier-Stokes and diffusion equations for an idealised coplanar UME. Characterisation of the UMEs with microscopy reveals imperfections on a 10 nm-1 pin length scale which impact mass-transport significantly. When these imperfections are included in the simulations, it is possible to account for the transport-limiting currents observed experimentally. A general implication of the studies in this paper is that even small perturbations in electrode structure can dramatically influence high-speed convective flow across small-scale UMEs, such that thorough geometric characterisation of UMEs employed in fast-flow systems is important. (c) 2007 Elsevier B.V. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Journal of Electroanalytical Chemistry | ||||
Publisher: | Elsevier SA | ||||
ISSN: | 0022-0728 | ||||
Official Date: | 15 April 2007 | ||||
Dates: |
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Volume: | Vol.602 | ||||
Number: | No.2 | ||||
Number of Pages: | 12 | ||||
Page Range: | pp. 263-274 | ||||
DOI: | 10.1016/j.jelechem.2007.01.014 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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