Electrocatalytic Oxidation of Glucose on the Ni-Al LDH/GQD/RGO Nanocomposite: Electrochemical determination

Development of the fast, sensitive and selective sensors for glucose determination is important in food industry, clinical analysis, biotechnology and many other areas [1]. In the recent years,remarkable attention has been paid to develop non-enzymatic modified electrodes to solve thedisadvantages of the enzyme-modified electrodes in the determination of glucose, such asinstability, high cost, complicated immobilization procedure and critical operating situation [1-3]. In this work a non-enzymatic glucose sensor based on a new Ni-Al LDH/GQD/RGO nanocompositewas developed. Firstly, Ni-Al LDH/GQD/RGO nanocomposite was synthetized via co-precipitation method and characterized by X-ray diffraction and cyclic voltammetry. Secondly, the electrocatalytic activity of the Ni-Al LDH/GQD/RGO nanocomposite modified electrode was studied toward the oxidation of the glucose in 0.1 M of NaOH solution. Glucose was oxidized at potential about -0.037 V vs SCE on the Ni-Al LDH/GQD/RGO nanocompositemodified electrode and corresponding anodic signal greatly increases by increasing the glucose concentration.The calibration plot is linear over the wide concentration range with a unique correlation coefficient and low detection limit.

کلیدواژه ها:

Electrochemical sensor ، Glucose determination ، Non-enzymatic ، Electrocatalysis ، Nanocomposite