Au-screen-printed electrode (SPE) (Model no: DRP 220 AT, Φ =
4 mm), which consists of working (WE), counter (CE), and reference
(RE) electrodes, was purchased from Metrohm dropSens (Asturias, Spain).
CV, SWV, and electrochemical impedance spectroscopy (EIS) were performed
with a potentiostat obtained from CH Instruments (Texas; Model no:
CH 660C). All electrochemical measurements were performed at room
temperature (RT) in a Faraday cage to ensure electromagnetic shielding.