Electrochemical preparation and characterization of a gold nanoparticles graphite electrode: Application to myricetin antioxidant analysis

摘要

Graphite material is abundantly available from recyclable sources. It possesses a good electrical conductance property,udwhich makes it an attractive material as a working electrode. However, due to a high activation overpotential it hasudlimited applications as compared to other solid metal electrodes. In this present work, we obtained a graphite rod from audused battery, and carried out electrochemical improvements by electro-deposition with gold nanoparticles (AuNPs). Theudheterogeneous electron transfer rate and electron transfer resistance of the fabricated electrode were improved. Theudelectrode overpotential has shown improvement by 50 mV, and the effective surface area has increased by 2 fold. Touddetermine the practicability of the AuNPs/graphite electrode, we used the electrode in the analysis of myricetin. A square-udwave voltammetry was used in the analysis, and the detection response increased by 2.5 fold, which suggested anudimprovement in the electrode sensitivity.