FACILE FABRICATION OF Co3O4/ITO ELECTRODE VIA ELECTROPHORETIC DEPOSITION FOR ELECTROCHEMICAL DETECTION OF Pb(II)

Trần Thị Thanh Lam; Triệu Thị Anh; Ma Thị Bình; Trần Quốc Toàn; Nguyễn Quốc Dũng

doi:10.34238/tnu-jst.13136

FACILE FABRICATION OF Co3O4/ITO ELECTRODE VIA ELECTROPHORETIC DEPOSITION FOR ELECTROCHEMICAL DETECTION OF Pb(II)

About this article

Received: 26/06/25 Revised: 20/08/25 Published: 20/08/25

Authors

1. Tran Thi Thanh Lam, TNU - University of Education
2. Trieu Thi Anh, TNU - University of Education
3. Ma Thi Binh, Yen Lam Secondary School – Tuyen Quang
4. Tran Quoc Toan, TNU - University of Education
5. Nguyen Quoc Dung , TNU - University of Education

Abstract

In this study, a simple and cost-effective method was developed to fabricate a Co₃O₄/ITO electrode through a three-step process: chemical precipitation of Co(OH)₂ from a Co(NO₃)₂ solution, electrophoretic deposition onto an ITO substrate, and low-temperature annealing at 300 °C to convert Co(OH)₂ into Co₃O₄. The resulting Co₃O₄nanostructure exhibited promising electrochemical activity for the detection of Pb(II) ions in aqueous solution. Differential pulse anodic stripping voltammetry was used to evaluate the sensor performance. The accumulation potential and time were systematically optimized, with the best values found to be –0.9 V and 300 s, respectively. Under these conditions, the sensor exhibited a linear current response to Pb(II) concentrations in the range of 0.01 to 2 µM, with a sensitivity of 35.72 µA cm^-2.µM^-1 and a detection limit of 0.0047 µM. Despite the simplicity of the fabrication method, the sensor demonstrated high performance, indicating its potential for the electrochemical detection of heavy metal ions in environmental monitoring.

Keywords

Cobalt oxide; Electrochemical sensor; Pb(II); Chemical precipitation; Electrophoretic deposition

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DOI: https://doi.org/10.34238/tnu-jst.13136

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