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Co 2 SnO 4 /Carbon Nanotubes Composites: A Novel Approach for Electrochemical Sensing of Hydrogen Peroxide
Author(s) -
Yedinak E.,
Venegas C. J.,
Brito T. P.,
RuizLeón D.,
Bollo S.
Publication year - 2018
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.201700551
Subject(s) - hydrogen peroxide , carbon nanotube , stannate , electrochemistry , catalysis , amperometry , materials science , composite number , cobalt , detection limit , carbon fibers , inorganic chemistry , chemical engineering , composite material , chemistry , electrode , organic chemistry , metallurgy , zinc , chromatography , engineering
For the first time Co 2 SnO 4 (CTO)/Carbon nanotubes (CNT) composites were prepared and used to modify glassy carbon electrodes for the amperometric determination of hydrogen peroxide. The catalytic activity of composites towards the oxidation of hydrogen peroxide was dependent on the quantity of CNT present in the composite and to the pH of the medium. The pure cobalt stannate phase with a ratio of 3 : 1 (CTO:CNT) exhibited the best catalytic activity towards hydrogen peroxide oxidation at low potentials (0.200 and 0.500 V). A linear relationship between current and hydrogen peroxide concentration was obtained with a sensitivity of 95 and 258 μA mM −1 and a detection limit of 0.130 and 0.08 μM respectively.