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<p>In this paper, Ni@Co<sub>3</sub>O<sub>4</sub>-<i>s</i>-rGO was synthesized and constructed as a non-enzymatic sensor to detect hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>). The prepared sample was characterized using SEM–EDX, UV–vis, XRD, and Raman spectroscopy. In 0.1&#xa0;M phosphate-buffered saline (PBS), the fabricated Ni@Co<sub>3</sub>O<sub>4</sub>-<i>s</i>-rGO amperometric sensor demonstrated a high sensitivity of 160.3 µA·mM⁻<sup>1</sup> towards H<sub>2</sub>O<sub>2</sub> within the linear detection range of 1 to 2000&#xa0;µM. The detection limit was also determined as 3.6&#xa0;µM. Furthermore, the Ni@Co<sub>3</sub>O<sub>4</sub>-<i>s</i>-rGO catalyst demonstrated high selectivity towards H<sub>2</sub>O<sub>2</sub>, even in the presence of common interferents. The enhanced electrochemical sensing ability of the catalyst is attributed to the synergy of three factors: the relatively large electrode active area, the high electrical conductivity, and the electron mobility in the presence of ultra-nanosized Ni particles.</p> Graphical Abstract <p></p>

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H2O2 Sensing on Co3O4-s-rGO Modified with Ni Nanodots

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Sedef Kaplan,
  • Rukan Suna Karatekin,
  • Meltem Kahya Düdükçü,
  • Gülşen Avcı

摘要

In this paper, Ni@Co3O4-s-rGO was synthesized and constructed as a non-enzymatic sensor to detect hydrogen peroxide (H2O2). The prepared sample was characterized using SEM–EDX, UV–vis, XRD, and Raman spectroscopy. In 0.1 M phosphate-buffered saline (PBS), the fabricated Ni@Co3O4-s-rGO amperometric sensor demonstrated a high sensitivity of 160.3 µA·mM⁻1 towards H2O2 within the linear detection range of 1 to 2000 µM. The detection limit was also determined as 3.6 µM. Furthermore, the Ni@Co3O4-s-rGO catalyst demonstrated high selectivity towards H2O2, even in the presence of common interferents. The enhanced electrochemical sensing ability of the catalyst is attributed to the synergy of three factors: the relatively large electrode active area, the high electrical conductivity, and the electron mobility in the presence of ultra-nanosized Ni particles.

Graphical Abstract