Abstract
The authors report that CuOx/NiOy hollow nanocomposites are an effective bifunctional catalyst capable of oxidizing glucose and reducing hydrogen peroxide. Synthesis is based on a solvothermal process and subsequent thermal treatment. The structure can be controlled by adjusting the amounts of added NiCl2 during the solvothermal etching process, and core-shell, yolk-shell or hollow structures can be obtained. The porous hollow structure composite of type CuO30/NiO90 was used to modify a glassy carbon electrode. It exhibits excellent electrocatalytic activity towards glucose oxidation in solution of pH 13, typically at a working potential of +0.60 V (vs. Ag/AgCl). This enables voltammetric sensing of glucose with (a) a low limit of detection (0.08 μM, at S/N = 3), (b) over a wide linear range (0.20 μM - 2.5 mM), and (c) high sensitivity (2043 μA·mM−1·cm−2). The sensor is reproducible, selective and stable. It can be used to detect glucose in spiked human serum. The CuO30/NiO90 composite also displays good electrocatalytic activity towards reduction of H2O2 in neutral aqueous medium, typically at an applied potential of −0.35 V. It has a detection limit of 90 nM, a sensitivity of 271.1 μA·mM−1·cm−2, and a linear detection range that extends from 0.30 μM to 9.0 mM.
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Acknowledgements
We gratefully acknowledge financial support from the National Natural Science Foundation of China (No. 21675147) and the Ministry of Science and Technology of China (No. 2016YFC1400601).
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Long, L., Liu, X., Chen, L. et al. A hollow CuOx/NiOy nanocomposite for amperometric and non-enzymatic sensing of glucose and hydrogen peroxide. Microchim Acta 186, 74 (2019). https://doi.org/10.1007/s00604-018-3183-x
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DOI: https://doi.org/10.1007/s00604-018-3183-x