Amperometric detection of hydrogen peroxide and its density functional theory for adsorption on Ag/TiO2 nanohybrid
Silver/titania (Ag/TiO 2 ) nanocomposites, synthesized through a simple one-step chemical reduction method, are used for electrochemical sensing of hydrogen peroxide (H 2 O 2 ). The images of transmission electron microscopic (TEM) demonstrate a well dispersion of Ag nanoparticles (NPs) with a parti...
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Published in | Journal of materials science. Materials in electronics Vol. 31; no. 8; pp. 6017 - 6026 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.04.2020
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Silver/titania (Ag/TiO
2
) nanocomposites, synthesized through a simple one-step chemical reduction method, are used for electrochemical sensing of hydrogen peroxide (H
2
O
2
). The images of transmission electron microscopic (TEM) demonstrate a well dispersion of Ag nanoparticles (NPs) with a particle size range of approximately 3 nm on the TiO
2
surface, which makes the sensor based on Ag/TiO
2
exhibit an excellent performance toward H
2
O
2.
The AgNPs presented in the nanocomposite exhibit electrocatalytic reduction of H
2
O
2
and the limit of detection (LOD) is found to be 1.23 µM. Density functional theory (DFT) calculation studies reveal that H
2
O
2
could be easily adsorbed onto Ag rather than TiO
2
surface of Ag/TiO
2
via a partial electron transfer from Ag to H
2
O
2
. The nanocomposite-modified electrode has also excellent selectivity toward the detection of H
2
O
2
over the interferents even when the interferents have a 100 times higher concentration than H
2
O
2. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-020-03153-9 |