non-enzymatic sensing of hydrogen peroxide using a glassy carbon electrode modified with nanolayers of manganese-calcium oxide

Abstract: manganese-calcium oxide has the chemical formula (mncao2). the appearance of this compound is dark brown powder. this compound is an effective catalyst for the oxidation of organic and inorganic compounds. in this research, glassy carbon (gc) electrode modified with manganese-calcium oxide nanolayers was used to study the electrochemical behavior and measurement of hydrogen peroxide. for this purpose, the surface of the electrode was modified by drop casting of nanolayers of manganese-calcium oxide. optimization of some parameters affecting the efficiency of the modified electrode decompositions such suspension, volume of drop, solution ph, buffer type, buffer concentration, electrolyte type and electrolyte concentration were performed using differential pulse voltammetry and cyclic voltammetry techniques [1,2]. mncao2 nanolayers were also examined by scanning electron microscopy (sem), x-ray energy diffraction (edx), x-ray diffraction (xrd) spectroscopy and fourier-transform infrared (ftir) spectroscopy. increasing the current and reducing the excess potential of hydrogen peroxide on the glassy carbon electrode modified with manganese-calcium oxide nanolayers is the main advantage of the designed sensor. this modified electrode has an excellent linear range and a lower detection limit than the bare glassy carbon electrode. the modified mncao2 / gc electrode has sensitivity, selectivity, stability, good reproducibility, larger active surface area than bare glassy carbon electrode and fast response. also, using differential pulse voltammetry technique, a calibration graph was drawn in concentration range of 49.75 to 1063.4 μm. finally, after obtaining a linear range with a detection limit of 47.84 μm, the analytical efficiency of this modified electrode against measurement of hydrogen peroxide in mouth wash solution was evaluated.