Boron-doped diamond dual-plate deep-microtrench device for generator-collector sulfide sensing

Harriet M. Harvey, Andrew J. Gross, Paula Brooksby, Alison J. Downard, Stephen J. Green, C. Peter Winlove, Nigel Benjamin, Paul G. Winyard, Matthew Whiteman, Jules L. Hammond, Pedro Estrela, Frank Marken

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A BDD-BDD dual-plate microtrench electrode with 6 μm inter-electrode spacing is investigated using generator-collector electrochemistry and shown to give microtrench depth-dependent sulfide detection down to the μM levels. The effect of the microtrench depth is compared for a “shallow” 44 μm and a “deep” 180 μm microtrench and linked to the reduction of oxygen to hydrogen peroxide which interferes with sulfide redox cycling. With a deeper microtrench and a fixed collector potential at −1.4 V vs. SCE, two distinct redox cycling potential domains are observed at 0.0 V vs. SCE (2-electron) and at 1.1 V vs. SCE (6-electron).
Original languageEnglish
Pages (from-to)2645-2653
Number of pages9
Issue number11
Early online date14 Jul 2015
Publication statusPublished - Nov 2015


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