Electrochemical Hydrogen Peroxide Sensing Based on Nano-Sized Byphenylic Ni Complex

In this project, we investigated a new non-enzymatic sensor for the measurement of hydrogen peroxide. The detection of hydrogen peroxide is important, since it is related to determination ofnumerous biological species, such as enzymes [1-3]. This sensor was prepared in the basis of Ni complex. The size of complex was characterized below 100 nm by the scanning electron microscopy. Moreover, the FT-IR spectroscopic studies of the complex confirmed the synthesisof the complex. Nickel complex was dispersed in ethanol and put on a glassy carbon electrode. The cyclic voltammetry and chronoamperometry were employed as electrochemical methods for monitoring the hydrogen peroxide detetion. Moreover, electrochemical impedance spectroscopywas utilized for the investigation of electrochemical behavior of the modified electrode. The study of cyclic voltammograms in different pH solution was performed. The pH=7 solution was considered for further studies due to the biological pH (pH=7.4). The potentials were chosen bythe increasing effect of the H2O2 injection on the signals. The H2O2 injection represented the reduction potential around -0.3 V versus Ag/AgCl reference electrode. The potential scan rate indicated linear relationship between peak current and the root of scan rate because of diffusion mechanism of mass transform.

کلیدواژه ها:

Byphenylic Ni complex ، cyclic voltammetry ، Chronoamperometry ، Hydrogen peroxide