Abstract
Ruthenium oxide hexacyanoferrate (RuOHCF) film was electrochemically deposited on to a glassy carbon (GC) surfaceusing consecutive cyclic voltammetry as a facile and green synthetic strategy. The electrochemical behaviour and electrocatalytic properties of the modified electrode Ru?HCF/GC were evaluated with regards to electroreduction of hydrogen peroxide and iodate in a strong acidic medium (pHs 1.0-2.0) by using different electrochemical techniques, including cyclic voltammetry and amperometry at a constant potential. Electrochemical studies indicated that Ru?HCF/GC possess a high catalytic activity in both studied reactions, fast response and good reproducibility of the current signal. The Ru?HCF/GC exhibits enhanced electrocatalytic behaviour compared with other modified electrodes reported before. The simple and reproducible procedure for electrode fabrication, the wide linear range, anti-interference performance and long-time stability of the Ru?HCF/GC make it a promising sensing material for practical quantitative determination of hydrogen peroxide and iodate. Remarkably, the reported modified.
Highlights
As an important class of inorganic poly-nuclear compounds Prussian blue and its analogues transition metal hexacyanoferrates (MHCF) have received considerable attention in material science and solid-state electrochemistry due to their unique characteristics – easy and cheap synthesis, ability to mediate/catalyze electrochemical reactions and faster kinetics.[1]
MHCF are known as useful electrocatalysts in selected processes – electrode materials modified with MHCF enhance slow electron transfer reactions of target analytes, being useful as electrochemical sensors
The electrochemical behaviour of the modified electrode Ruthenium oxide hexacyanoferrate (RuOHCF)/glassy carbon (GC) was evaluated in strongly acidic aqueous solution by recording cyclic voltammograms in electrolyte 0.05 M HCl + 0.5 M KCl
Summary
As an important class of inorganic poly-nuclear compounds Prussian blue (ferric hexacyanoferrate, PB) and its analogues transition metal hexacyanoferrates (MHCF) have received considerable attention in material science and solid-state electrochemistry due to their unique characteristics – easy and cheap synthesis, ability to mediate/catalyze electrochemical reactions and faster kinetics.[1]. 22,23 Several analytical techniques, such as spectrophotometry,[24] flame atomic absorption spectrometry (FAAS),[25] chemiluminescence[26] and gas chromatography-mass spectrometry[27] have been used for iodate sensing Most of these methods are not suitable for routine analysis as they required expensive equipment and some of them are based on indirect reactions where species with appropriate characteristics have to be produced for quantitative detection of the target analyte. Compared with these techniques, electrochemical sensors provide a simple, selective and inexpensive approach to monitor iodate content. The investigation of RuOHCF film stability and electrocatalytic effect on iodate reduction demonstrated that GC modified with RuOHFC works as an efficient catalyst with higher sensitivity and wider linear range compared to other sensors
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