MXene/La3+ Doped ZnO/Hb Nanocomposite Modified Glassy Carbon Electrode as Novel Voltammetric Sensor for Determination of Hydrogen Peroxide

The purpose of the present study was to introduce a new voltammetric sensor of MXene/La3+-doped ZnO/hemoglobin (Hb) nanocomposite-modified glassy carbon electrode (MXene/La3+-doped ZnO/Hb/GCE) with a potential electro-conductivity and catalytic activity to detect the presence of hydrogen peroxide (H2O2). To this end, the method of cyclic voltammetry was used to analyze the electrochemical behavior of H2O2. The cathodic potential scanning showed the reduction peak at the potential of -0.2 V. The results revealed higher cathodic peak currents (I-pc) for the MXene/La3+-doped ZnO/Hb/GCE sensor when compared with a GCE alone. Moreover, using a differential pulse voltammetry, the range of linear concentration was obtained to be between 2.0 x 10(-7) and 4.0 x 10(-4) M, presenting the detection limit of 8.0 x 10(-8) M. Additionally, acceptable recoveries were observed for the proposed approach in water samples.