title: Superstable advanced hydrogen peroxide transducer based on transition metal hexacyanoferrates.
abstract: We report on a superstable hydrogen peroxide (H(2)O(2)) 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 H(2)O(2) transducer. The electrochemically deposited five bilayers of PB-NiHCF exhibit a complete stability under the continuous wall-jet flow of 1 mM of H(2)O(2) 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.
authors.affiliation: Chemistry and Material Science faculties of M.V. Lomonosov Moscow State University, 119991, Moscow, Russia.
authors.forename: Natalya A
authors.initials: NA
authors.lastname: Sitnikova
authors.forename: Anastasiya V
authors.initials: AV
authors.lastname: Borisova
authors.forename: Maria A
authors.initials: MA
authors.lastname: Komkova
authors.forename: Arkady A
authors.initials: AA
authors.lastname: Karyakin