Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode
Nitrite (NO<sub>2</sub><sup>−</sup>) has long been recognized as a contaminant of concern due to its detrimental effects on both human health and the environment. As a result, there is a continuing need to develop sensitive, real-time, low-cost, and portable systems for the a...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/25/12/3764 |
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| Summary: | Nitrite (NO<sub>2</sub><sup>−</sup>) has long been recognized as a contaminant of concern due to its detrimental effects on both human health and the environment. As a result, there is a continuing need to develop sensitive, real-time, low-cost, and portable systems for the accurate detection of trace levels of NO<sub>2</sub><sup>−</sup> in drinking water. We present a novel, low-cost, and easy-to-fabricate amperometric sensor designed for detecting low concentrations of NO<sub>2</sub><sup>−</sup> in drinking water. The fabrication technique involves the electrodeposition of manganese and copper oxides onto a carbon working electrode. CuO and MnO<sub>2</sub> act synergistically as efficient catalysts for the electrooxidation of nitrite to nitrate (NO<sub>3</sub><sup>−</sup>) thanks to their complementary redox properties. The resulting sensor exhibits high catalytic activity toward the electrooxidation of NO<sub>2</sub><sup>−</sup>, with a sensitivity of 10.83 μA/µM, a limit of detection (LOD) of 0.071 µM, and a good linear dynamic concentration range (0.2–60 µM). The sensor’s performance was evaluated against potential interfering analytes (NO<sub>3</sub><sup>−</sup>, Cl<sup>−</sup>, NH<sub>4</sub><sup>+</sup>, and NH<sub>2</sub>Cl), all of which showed negligible interference. Reproducibility (maximum standard deviation 2.91%) and repeatability (usable up to three times) were also evaluated. |
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| ISSN: | 1424-8220 |