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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MDPI AG
2025-06-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/25/12/3764 |
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| author | Roberta Farina Silvia Scalese Alessandra Alberti Stefania Maria Serena Privitera Giuseppe Emanuele Capuano Domenico Corso Giuseppe Andrea Screpis Serena Concetta Rita Reina Guglielmo Guido Condorelli Maria Anna Coniglio Sebania Libertino |
| author_facet | Roberta Farina Silvia Scalese Alessandra Alberti Stefania Maria Serena Privitera Giuseppe Emanuele Capuano Domenico Corso Giuseppe Andrea Screpis Serena Concetta Rita Reina Guglielmo Guido Condorelli Maria Anna Coniglio Sebania Libertino |
| author_sort | Roberta Farina |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-c6fee392b05b4cb6aa2a00923d147c07 |
| institution | Kabale University |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-c6fee392b05b4cb6aa2a00923d147c072025-08-20T03:27:32ZengMDPI AGSensors1424-82202025-06-012512376410.3390/s25123764Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed ElectrodeRoberta Farina0Silvia Scalese1Alessandra Alberti2Stefania Maria Serena Privitera3Giuseppe Emanuele Capuano4Domenico Corso5Giuseppe Andrea Screpis6Serena Concetta Rita Reina7Guglielmo Guido Condorelli8Maria Anna Coniglio9Sebania Libertino10Consiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyDipartimento di Scienze Mediche, Chirurgiche e Tecnologie Avanzate “G.F. Ingrassia”, Università Degli Studi di Catania, Via S. Sofia 87, 95123 Catania, ItalyDipartimento di Scienze Chimiche, Università Degli Studi di Catania, Viale A. Doria 6, 95125 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyConsiglio Nazionale delle Ricerche—Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII Z.I., 5, 95121 Catania, ItalyNitrite (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.https://www.mdpi.com/1424-8220/25/12/3764nitrite sensingmetal oxideselectrocatalysiselectrodepositioncyclic voltammetrynitrite oxidation |
| spellingShingle | Roberta Farina Silvia Scalese Alessandra Alberti Stefania Maria Serena Privitera Giuseppe Emanuele Capuano Domenico Corso Giuseppe Andrea Screpis Serena Concetta Rita Reina Guglielmo Guido Condorelli Maria Anna Coniglio Sebania Libertino Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode Sensors nitrite sensing metal oxides electrocatalysis electrodeposition cyclic voltammetry nitrite oxidation |
| title | Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode |
| title_full | Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode |
| title_fullStr | Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode |
| title_full_unstemmed | Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode |
| title_short | Electrocatalytical Nitrite Oxidation via Manganese and Copper Oxides on Carbon Screen-Printed Electrode |
| title_sort | electrocatalytical nitrite oxidation via manganese and copper oxides on carbon screen printed electrode |
| topic | nitrite sensing metal oxides electrocatalysis electrodeposition cyclic voltammetry nitrite oxidation |
| url | https://www.mdpi.com/1424-8220/25/12/3764 |
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