Facile preparation of urchin-like NiCo₂O₄ microspheres for efficient hydrogen peroxide detection

Abstract

In this work, urchin-like NiCo 2 O 4 microspheres were prepared via a facile ionic liquid-assisted hydrothermal synthesis and used as non-enzymatic H 2 O 2 sensors for the first time. The porous structure and high surface area of the NiCo 2 O 4 microspheres provide plentiful active sites for electrocatalytic H 2 O 2 oxidation. When adapted into an electrochemical sensor for H 2 O 2 , the microsensors showed fast response of 4 s, a high sensitivity of 392.5 μA·mM -1 cm -2 , and a wide linear range towards H 2 O 2 (0-14 mM). The detection limit was as low as 0.05 μM, significantly lower than other published high performance NiCo 2 O 4 -based H 2 O 2 sensors. Furthermore, this non-enzymatic sensor exhibits good selectivity for H 2 O 2 . These results suggest that NiCo 2 O 4 microspheres could be a promising material for trace H 2 O 2 detection.

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Identifiers

DOI

10.1039/d2ra05778f

PubMed

36540244

Journal

RSC Advances

Year

2022