Abstract
Reduced graphene oxide hollow microspheres (rGO HMS) were encapsulated with gold nanoparticles (AuNPs) by spray drying. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the AuNP/rGO HMS. When placed on a glassy carbon electrode (GCE), it exhibits excellent electrochemical catalytic properties towards the oxidation of nitrite. The electrocatalytic properties were studied using various electrochemical techniques. Compared to AuNP-decorated graphene sheet based electrodes documented in the literature, the one presented here provides a larger surface area. This enhances the catalytic activity towards nitrite. The electrode, typically operated at a working potential of 0.82 V (vs. SCE), has a linear response in the 5.0 μM to 2.6 mM nitrate concentration range, and a detection limit as low as 0.5 μM (at an S/N ratio of 3).
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Acknowledgements
This work was supported by the National Natural Science Foundation of China grant (No. 21475076), International S&T collaboration Program of China (No. 2015DFA50060), Innovation and achievement transformation projects of Shandong Province(NO. 2014ZZCCX01401).
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Zhang, F., Yuan, Y., Zheng, Y. et al. A glassy carbon electrode modified with gold nanoparticle-encapsulated graphene oxide hollow microspheres for voltammetric sensing of nitrite. Microchim Acta 184, 1565–1572 (2017). https://doi.org/10.1007/s00604-017-2264-6
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DOI: https://doi.org/10.1007/s00604-017-2264-6