Flow Injection Amperometric Analysis of H₂O₂ at Platinum Nanoparticles Modified Pencil Graphite Electrode

Abstract

A Pt nanoparticle modified Pencil Graphite Electrode (PGE) was proposed for the electrocatalytic oxidation and non‐enzymatic determination of H2O2 in Flow Injection Analysis (FIA) system. Platinum nanoparticles (PtNPs) electrochemically deposited on pretreated PGE (p.PGE) surface by recording cyclic voltammograms of 1.0 mM of H2PtCl6 solution in 0.10 M KCl at scan rate of 50 mV s−1 for 30 cycles. Cyclic voltammograms show that the oxidation peak potential of H2O2 shifts from about +700 mV at bare PGE to +50 mV at PtNPs/p.PGE vs. Ag/AgCl /KCl (sat.). It can be concluded that PtNPs/p.PGE exhibits a good electrocatalytic activity towards oxidation of H2O2. Then, FI amperometric analysis of H2O2 was performed under optimized conditions using a new homemade electrochemical flow cell which was constructed for PGE. Linear range was found as 2.5 μM to 750.0 μM H2O2 with a detection limit of 0.73 μM (based on Sb/m of 3). As a result, this study shows the first study on the FI amperometric determination of H2O2 at PtNPs/p.PGE which exhibits a simple, low cost, commercially available, disposable sensor for H2O2 detection. The proposed electrode was successfully applied to determination of H2O2 in real sample.

Highly sensitive H2O2 sensor based on poly(azure A)-platinum nanoparticles deposited on activated screen printed carbon electrodes

“…7A). Ascorbic acid was studied separately since it is usually the most problematic interfering compound in the determination of H2O2 [45,46]. Fig.…”

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

“…The good recovery percentage (95.2–96.2 %) and interference study demonstrated the selectivity toward the complex sample matrices. Pt nanoparticle modified pencil graphite electrode was applied in the first flow injection amperometric analysis of H 2 O 2 , which was successfully applied to determination of H 2 O 2 in a hair dye sample . Due to the wide presence, it is quite reasonable for environmental H 2 O 2 detection …”

“…was applied in the first flow injection amperometric analysis of H 2 O 2 , which was successfully applied to determination of H 2 O 2 in a hair dye sample. [163] Due to the wide presence, it is quite reasonable for environmental H 2 O 2 detection. [164]…”

A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H2O2: A Flow Injection Amperometric Sensor

“…In H 2 O 2 assay, the modified electrodes prepared by covering bare electrode surfaces with metallic/bimetallic nanoparticles, carbon nanotubes, metal oxides, graphene or their hybrids are the most extensively used electrodes. [19][20][21][22][23][24][25][26] Moreover, one of the most efficient ways is the preparation of modified electrodes with redox active mediators which increase the rate of electron transfer between analyte and electrode. Thus CMEs prepared with different types of mediators have been reported for the determination of H 2 O 2 .…”

“…Recently, PGE has been extensively used in the development of electrochemical sensors/biosensors due to its favorable functions such as disposability, cheapness, commercial availability, ease of modification, etc. [21,22,26,[53][54][55][56] Thus, the novelty of this study is the introduction of a disposable, fast, sensitive, cheap amperometric H 2 O 2 sensor in FIA system as well as the use of the CUPRAC reagent (i. e. [Cu(Nc) 2 ] 2 + complex) as a new redox mediator for electrode modification in the electrocatalytic oxidation of H 2 O 2 .…”