Electrodeposition of CoFeS nanoflakes on Cu 2 O nanospheres as an ultrasensitive sensing platform for measurement of the hydrazine and hydrogen peroxide in seawater sample.

Autor: Darvishmehr Z; Department of Chemistry, Sharif University of Technology, Tehran, Iran., Naderi L; Department of Chemistry, Sharif University of Technology, Tehran, Iran., Shahrokhian S; Department of Chemistry, Sharif University of Technology, Tehran, Iran. Electronic address: shahrokhian@sharif.edu., Ezzati M; Department of Chemistry, Sharif University of Technology, Tehran, Iran.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Mar; Vol. 352, pp. 141340. Date of Electronic Publication: 2024 Jan 30.
DOI: 10.1016/j.chemosphere.2024.141340
Abstrakt: Nanoarchitectured design of the metal sulfides with highly available surface and abundant electroactive centers and using them as electrocatalyst for fabricate the electrochemical sensors for the detection of hydrazine (N 2 H 4 ) and hydrogen peroxide (H 2 O 2 ) is challenging and desirable. Herein, Cu 2 O nanospheres powder is firstly prepared using chemical reduction of copper chloride and then drop-casted on the glassy carbon electrode (GCE) surface. In the next step, CoFeS nanoflakes are electrodeposited on Cu 2 O nanospheres by cyclic voltammetry method to form CoFeS/Cu 2 O nanocomposite as a detection platform for measuring N 2 H 4 and H 2 O 2 . Accordingly, Cu 2 O nanospheres are not only used as substrate, but also guided the CoFeS nanoflakes to adhere to the electrode surface without need to any binder or conductive additive, which enhances the electrical conductivity of the sensing active materials. As the hydrazine sensor, the CoFeS/Cu 2 O/GCE displayed wide linear ranges (0.0001-0.021 mM and 0.021-1.771 mM), low detection limit (0.12 μM), very high sensitivities (103.33 and 21.23 mA mM -1 cm -2 ), and excellent selectivity. The as-made nanocomposite also exhibited low detection limit of 1.26 μM for H 2 O 2 sensing with very high sensitivities (12.31 and 3.96 mA mM -1 cm -2 ) for linear ranges of 0.001-0.03 mM and 0.03-2.03 mM, respectively, and negligible response against interfering substances. The superior analytical performance of the CoFeS/Cu 2 O for N 2 H 4 electro-oxidation and H 2 O 2 electro-reduction can be attributed to structure stability, high electroactive surface area, and good availability to analyte species and electrolyte diffusion. Moreover, to examine the potency of the prepared nanocomposite in real applications, the seawater sample was analyzed and results display that the CoFeS/Cu 2 O/GCE can be utilized as a reliable and applicable platform for measuring N 2 H 4 and H 2 O 2 .
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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