Superstable Advanced Hydrogen Peroxide Transducer Based on Transition Metal Hexacyanoferrates

We report on a superstable hydrogen peroxide (H2O2) transducer made by sequential deposition of the iron- and nickel-hexacyanoferrate (NiHCF) layers. Both chemical and mechanical stability of the latter, as well as similarity of its structure to Prussian Blue (PB) provide a substantial stabilization...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2011-03, Vol.83 (6), p.2359-2363
Main Authors: Sitnikova, Natalya A, Borisova, Anastasiya V, Komkova, Maria A, Karyakin, Arkady A
Format: Article
Language:English
Subjects:
Analytical chemistry
Electrocatalysis
Electrodes
Hydrogen peroxide
Molecular chemistry
Molecules
Transducers
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Summary:We report on a superstable hydrogen peroxide (H2O2) transducer made by sequential deposition of the iron- and nickel-hexacyanoferrate (NiHCF) layers. Both chemical and mechanical stability of the latter, as well as similarity of its structure to Prussian Blue (PB) provide a substantial stabilization of the most advantageous H2O2 transducer. The electrochemically deposited five bilayers of PB-NiHCF exhibit a complete stability under the continuous wall-jet flow of 1 mM of H2O2 during more than 2 h, maintaining current at a level of 0.2 mA cm−2, whereas common Prussian Blue loses half of its response within the first 20−25 min. Even being deposited in the open circuit regime on screen-printed electrodes, PB-NiHCF bilayers dramatically improve tolerance of the resulting transducer to alkaline solutions and iron ligands. Despite their 2−2.5 times decreased sensitivity (compared to common Prussian Blue), the sequentially deposited bilayers of PB-NiHCF provide a similar dynamic range of the transducer due to the decreased noise level.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac1033352