RESUMEN
A large-area graphene platform electrode (GPE) was fabricated by transferring the chemical vapor deposition (CVD) graphene grown on Cu foils to polyethylene terephthalate (PET) substrates with the aid of polymethyl-methacrylate (PMMA).Then cobalt hexacyanoferrate (CoHCF) was electrodeposited on the GPE by cyclic voltammetry to obtain a CoHCF/GPE.The morphology and electrochemical properties of this electrode were studied by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and the electrochemical measurements.Results showed that the electrode had favorable sensing effect toward H2O2.On the basis of this, a new nonenzyme H2O2 sensor was constructed.Under the optimal experimental conditions, the proposed sensor had a quick response to the addition of H2O2 (about 2 s) with a wide linear rang (5 × 10-3-1.2 mmol/L) and a low detection limit (7.1 nmol/L).This sensor was easy to fabricate and showed excellent stability and anti-interference ability.