A glassy carbon electrode modified with gold nanoparticle-encapsulated graphene oxide hollow microspheres for voltammetric sensing of nitrite

作者：Zhang Fuhua; Yuan Yawen; Zheng Yiqun; Wang Hua; Liu Tonghao; Hou Shifeng^*

来源：Microchimica Acta, 2017, 184(6): 1565-1572.

DOI：10.1007/s00604-017-2264-6

• Composite materials
• AuNPs
• Cyclic voltammetry
• Spray drying
• Electrocatalysis

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 mu M to 2.6 mM nitrate concentration range, and a detection limit as low as 0.5 mu M (at an S/N ratio of 3).

• 出版日期2017-6
• 单位山东大学