Selective Electroanalysis of Ascorbic Acid Using a Nickel Hexacyanoferrate and Poly(3,4‐ethylenedioxythiophene) Hybrid Film Modified Electrode

The mixed-valent nickel hexacyanoferrate (NiHCF) and poly(3,4-ethylenedioxythiophene) (PEDOT) hybrid film (NiHCF-PEDOT) was prepared on a glassy carbon electrode (GCE) by multiple scan cyclic voltammetry. The films were characterized using atomic force microscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and electrochemical impedance spectroscopy (AC impedance). The advantages of these films were demonstrated for the detection of ascorbic acid (AA) using cyclic voltammetry and amperometric techniques. The electrocatalytic oxidation of AA at different electrode surfaces, such as the bare GCE, the NiHCF/ GCE, and the NiHCF-PEDOT/GCE modified electrodes, was determined in phosphate buffer solution (pH 7). The AA electrochemical sensor exhibited a linear response from 5 � 10 � 6 to 1.5 � 10 � 4 M( R 2 ¼ 0.9973) and from 1.55 � 10 � 4 to 3 � 10 � 4 M( R 2 ¼ 0.9983), detection limit ¼ 1 � 10 � 6 M, with a fast response time (3 s) for AA determination. In addition, the NiHCF-PEDOT/GCE was advantageous in terms of its simple preparation, specificity, stability and reproducibility.

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