Novel Electrochemical Microsensor for Hydrogen Peroxide based on Iron‐Ruthenium Hexacyanoferrate Modified Carbon Fiber Electrode

Abstract

Novel electrochemical microsensor based on mixed iron-ruthenium hexacyanoferrate (FeRuHCF) modified carbon fiber microelectrode (CFME) is presented for voltammetric and amperometric measurement of hydrogen peroxide at physiological pH. The FeRuHCF coating was electrochemically deposited using a one step procedure onto the substrate carbon fiber microelectrode by cycling the potential between 0.0 and þ 1.0 V (vs. Ag/AgCl) in a solution containing all precursor salts. The microsensor displayed good stability in neutral and alkaline media and had a nonstop working lifetime of up to 12 hours. The amperometric response time varied from 5 to 15 s depending on the hydrogen peroxide concentration level. The newly developed electrochemical microsensor exhibited a highly linear behavior in the examined concentration range from 5 to 1000 mmol, and a favorable reproducibility with a calculated RSD of 2.9% (n ¼ 6) for 100 mmol L À1 hydrogen peroxide, thus holding great promise for its further application in real samples and its exploitation in combination with biorecognition elements in advanced microbiosensor design.

Response Behavior of Amperometric Glucose Biosensors Based on Different Carbon Substrate Transducers Coated with Enzyme‐Active Layer: A Comparative Study

“…As expected, due to the presence of an organic binder in screenprinted electrodes a decreased rate of electron transfer is observed. After the addition of 3 mM H 2 O 2 into the buffer solution, there was a decrease in the anodic current and an increase in the cathodic current in all three cases, as has been previously reported for carbon fiber based electrodes [12]. The same reaction mechanism as for most Prussian blue analogues is suggested.…”

Amperometric determination of hydrogen peroxide on surface of a novel PbPCNF-modified carbon-ceramic electrode in acidic medium

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Thin functionalized films on cylindrical microelectrodes for electrochemical determination of Hg(II)

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