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Boron‐Doped Diamond Dual‐Plate Deep‐Microtrench Device for Generator‐Collector Sulfide Sensing
Author(s) -
Harvey Harriet M.,
Gross Andrew J.,
Brooksby Paula,
Downard Alison J.,
Green Stephen J.,
Winlove C. Peter,
Benjamin Nigel,
Winyard Paul G.,
Whiteman Matthew,
Hammond Jules L.,
Estrela Pedro,
Marken Frank
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500288
Subject(s) - redox , sulfide , electrode , hydrogen peroxide , electrochemistry , diamond , chemistry , materials science , boron , inorganic chemistry , doping , analytical chemistry (journal) , optoelectronics , metallurgy , environmental chemistry , organic chemistry
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).