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Volume 190, 2016
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Advances in electroanalysis, sensing and monitoring in molten salts

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Abstract

Microelectrodes have a number of advantages over macroelectrodes for quantitative electroanalysis and monitoring, including reduced iR drop, a high signal-to-noise ratio and reduced sensitivity to convection. Their use in molten salts has been generally precluded by the combined materials challenges of stresses associated with thermal cycling and physical and corrosive chemical degradation at the relatively high temperatures involved. We have shown that microfabrication, employing high precision photolithographic patterning in combination with the controlled deposition of materials, can be used to successfully address these challenges. The resulting molten salt compatible microelectrodes (MSMs) enable prolonged quantitative microelectrode measurements in molten salts (MSs). This paper reports the fabrication of novel MSM disc electrodes, chosen because they have an established ambient analytical response. It includes a detailed set of electrochemical characterisation studies which demonstrate both their enhanced capability over macroelectrodes and over commercial glass pulled microelectrodes, and their ability to extract quantitative electroanalytical information from MS systems. MSM measurements are then used to demonstrate their potential for shedding new light on the fundamental properties of, and processes in, MSs, such as mass transport, charge transfer reaction rates and the selective plating/stripping and alloying reactions of liquid Bi and other metals; this will underpin the development of enhanced MS industrial processes, including pyrochemical spent nuclear fuel reprocessing.

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Publication details

The article was received on 06 Jan 2016, accepted on 11 Feb 2016 and first published on 11 Feb 2016


Article type: Paper
DOI: 10.1039/C6FD00002A
Faraday Discuss., 2016,190, 351-366
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    Advances in electroanalysis, sensing and monitoring in molten salts

    D. K. Corrigan, J. P. Elliott, E. O. Blair, S. J. Reeves, I. Schmüser, A. J. Walton and A. R. Mount, Faraday Discuss., 2016, 190, 351
    DOI: 10.1039/C6FD00002A

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