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Carbon Electrodes Modified by Nanoscopic Iron(III) Oxides to Assemble Chemical Sensors for the Hydrogen Peroxide Amperometric Detection
Author(s) -
Hrbac Jan,
Halouzka Vladimir,
Zboril Radek,
Papadopoulos Kyriakos,
Triantis Theodor
Publication year - 2007
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200703938
Subject(s) - hydrogen peroxide , detection limit , ferrihydrite , amperometry , ferric , hematite , inorganic chemistry , electrode , catalysis , maghemite , reproducibility , carbon paste electrode , amorphous solid , carbon fibers , materials science , redox , reversible hydrogen electrode , chemistry , iron oxide , nanoparticle , electrochemistry , cyclic voltammetry , working electrode , nanotechnology , mineralogy , chromatography , organic chemistry , adsorption , metallurgy , composite material , composite number
In this study we show that nanoparticles of various ferric oxides (hematite, maghemite, amorphous Fe 2 O 3 , β‐Fe 2 O 3 and ferrihydrite) incorporated into carbon paste exhibit electro‐catalytic properties towards hydrogen peroxide reduction. The modified paste electrode performances were evaluated and compared with those obtained with Prussian Blue‐modified carbon paste electrode, which represents an excellent chemical mediator towards the H 2 O 2 redox reaction (as widely described in literature). The best catalytic activity was found for carbon paste modified by amorphous ferric oxide with 2–4 nm particle size, which was further tested for possible application as hydrogen peroxide sensor. At pH 7, the limit of detection was 2×10 −5 M H 2 O 2 ( S / N =3), the calibration curves were linear upto 8.5 mM H 2 O 2 ( R 2 =0.998), the measurement reproducibility ( RSD =97%, n =4), the interelectrode reproducibility ( RSD =16%, n electrodes =5) and <3 s response time.