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<p>The widespread use of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in everyday life and especially in industrial processes cannot be underestimated. But its higher level may cause threatening effect to living organism leading to produce various toxic diseases, which has drawn large attention of researchers to sensitively detect its real amount carefully. Thus, in the present research work we have fabricated different nanocomposites (CNNi-1, CNNi-2, and CNNi-3 NCSs) catalyst by the mixing of two-dimensional (2D) g-C<sub>3</sub>N<sub>4</sub> and NiO, through simple hydrothermal method followed by varying calcination temperature of 350, 400, and 450&#xa0;°C. Among these catalysts, the as-prepared CNNi-2 nanocomposite exhibited large hierarchical structure with excellent surface area and mesoporous structure were deposited on fluorine-doped tin-oxide (FTO) substrate by moderate spray-pyrolysis process and exposed it for electrochemically sensitive detection of H<sub>2</sub>O<sub>2</sub>. The CNNi-2 nanocomposite sensor reveals outstanding electro-oxidation performances toward H<sub>2</sub>O<sub>2</sub> at scanning rate of 10&#xa0;m.Vs<sup>−1</sup> against Ag/AgCl. Further, it also exhibits better and wider linear range of H<sub>2</sub>O<sub>2</sub> concentration ranging from 0.001 to 0.750&#xa0;μM with R<sup>2</sup> value of 0.9978 and lower detection limit (LOD) of 0.10 ± 0.04&#xa0;μM (S/N = 3). In addition, the sensor also persists higher selectivity toward H<sub>2</sub>O<sub>2</sub> and splendid stability of 8&#xa0;weeks. Moreover, the sensor evaluates excellent reproducibility (4 times) by giving RSD value of 3.23%. On the other hand, the sensor also perceives superb practicability in real sample analysis (human blood serum samples (identical person) and water samples (tap water obtained from laboratory). Thus, as a result we concluded that our fabricated electrochemical sensor was highly favorable and might highlighted its usage in future perspective.</p>

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Fabrication of an electrochemical sensor based on g-C3N4–NiO nanocomposite for sensitive and selective detection of hydrogen peroxide

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Mohib Ullah,
  • Prakash Kanjariya,
  • M. M. Rekha,
  • Mayank Kundlas,
  • G. V. Siva Prasad,
  • Mamata Chahar,
  • Ali Algahtani,
  • Vineet Tirth,
  • Li Zhengxin

摘要

The widespread use of hydrogen peroxide (H2O2) in everyday life and especially in industrial processes cannot be underestimated. But its higher level may cause threatening effect to living organism leading to produce various toxic diseases, which has drawn large attention of researchers to sensitively detect its real amount carefully. Thus, in the present research work we have fabricated different nanocomposites (CNNi-1, CNNi-2, and CNNi-3 NCSs) catalyst by the mixing of two-dimensional (2D) g-C3N4 and NiO, through simple hydrothermal method followed by varying calcination temperature of 350, 400, and 450 °C. Among these catalysts, the as-prepared CNNi-2 nanocomposite exhibited large hierarchical structure with excellent surface area and mesoporous structure were deposited on fluorine-doped tin-oxide (FTO) substrate by moderate spray-pyrolysis process and exposed it for electrochemically sensitive detection of H2O2. The CNNi-2 nanocomposite sensor reveals outstanding electro-oxidation performances toward H2O2 at scanning rate of 10 m.Vs−1 against Ag/AgCl. Further, it also exhibits better and wider linear range of H2O2 concentration ranging from 0.001 to 0.750 μM with R2 value of 0.9978 and lower detection limit (LOD) of 0.10 ± 0.04 μM (S/N = 3). In addition, the sensor also persists higher selectivity toward H2O2 and splendid stability of 8 weeks. Moreover, the sensor evaluates excellent reproducibility (4 times) by giving RSD value of 3.23%. On the other hand, the sensor also perceives superb practicability in real sample analysis (human blood serum samples (identical person) and water samples (tap water obtained from laboratory). Thus, as a result we concluded that our fabricated electrochemical sensor was highly favorable and might highlighted its usage in future perspective.