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<p>In this study, a metallo-supramolecular polymer (metallo-SMP) was synthesized using Co(II) and Ru(II) with a bisterpyridine ligand, referred to as polyCoRu. It was utilized as an electrocatalyst for the detection of nitrite (NO<sub>2</sub><sup>−</sup>) ions. A glassy carbon electrode (GCE) was fabricated using the metallo-SMP. It underwent various electrochemical analyses to assess its efficiency in sensing nitrite in a 0.1&#xa0;M phosphate buffer solution (PBS) at pH 7. The polyCoRu/GCE demonstrated excellent electrochemical activity, evidenced by a well-defined peak observed through cyclic voltammetry (CV) analysis. This new system exhibited a wide linear detection range from 3.38 to 2140&#xa0;μM, with a calculated limit of detection (LOD) of 0.22&#xa0;μM determined using the amperometric (i-t) method. An insightful study of the sensing mechanism for nitrite oxidation on polyCoRu/GCE was conducted, supported by existing literature. The oxidation process followed first-order kinetics, with a heterogeneous rate constant of <i>k</i> = 1.97 × 10<sup>–3</sup>&#xa0;cm/s. Tests for stability, reliability, reproducibility, and selectivity confirmed that polyCoRu is an excellent electrocatalyst for nitrite sensing. Finally, real sample analyses demonstrated the practical applicability of the sensor, establishing it as a low-cost and reliable system for nitrite detection.</p> Graphical abstract <p></p>

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Electrochemical detection of nitrite at Co(II) and Ru(II)-based metallo-supramolecular polymer-modified glassy carbon electrode and study the kinetics of electron transfer

  • 期刊论文

  • 发表日期：

    2025年1月15日

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  • Abdul Awal,
  • Md. Mithu Mia,
  • S. M. Abu Nayem,
  • Md. Rajibul Akanda,
  • Tamanna Islam,
  • Md. Mahedi Hasan,
  • Md. Delwar Hossain,
  • A. J. Saleh Ahammad

摘要

In this study, a metallo-supramolecular polymer (metallo-SMP) was synthesized using Co(II) and Ru(II) with a bisterpyridine ligand, referred to as polyCoRu. It was utilized as an electrocatalyst for the detection of nitrite (NO2−) ions. A glassy carbon electrode (GCE) was fabricated using the metallo-SMP. It underwent various electrochemical analyses to assess its efficiency in sensing nitrite in a 0.1 M phosphate buffer solution (PBS) at pH 7. The polyCoRu/GCE demonstrated excellent electrochemical activity, evidenced by a well-defined peak observed through cyclic voltammetry (CV) analysis. This new system exhibited a wide linear detection range from 3.38 to 2140 μM, with a calculated limit of detection (LOD) of 0.22 μM determined using the amperometric (i-t) method. An insightful study of the sensing mechanism for nitrite oxidation on polyCoRu/GCE was conducted, supported by existing literature. The oxidation process followed first-order kinetics, with a heterogeneous rate constant of k = 1.97 × 10–3 cm/s. Tests for stability, reliability, reproducibility, and selectivity confirmed that polyCoRu is an excellent electrocatalyst for nitrite sensing. Finally, real sample analyses demonstrated the practical applicability of the sensor, establishing it as a low-cost and reliable system for nitrite detection.

Graphical abstract