Manganese oxides/carbon nanowall nanocomposite electrode as an efficient non-enzymatic electrochemical sensor for hydrogen peroxide

Plasma-enhanced chemical vapor deposition in a CO/H-2 microwave discharge system was performed for synthesizing of carbon nanowalls template and subsequently potentiostatic anodic deposition technique was applied for depositing of manganese oxides onto the carbon nanowall surfaces. Characterization of the synthesized nanocomposite films was done via scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The electrochemical properties of MnOx/CNW electrode were investigated by cyclic voltammetry and amperometry techniques. The prepared nanocomposite electrode exhibited high electrochemical activity for the detection of hydrogen peroxide (H2O2) in phosphate buffer solution at an applied potential of +0.7 V, showing a linear dependence on the concentration of H2O2 from 40 mu M to 10,230 mu M, a high sensitivity (698.6 mu A mM(-1) cm(-2)), and a detection limit of 0.55 mu M (signal/noise = 3). The sensor exhibited good selectivity toward hydrogen peroxide detection against ascorbic acid, uric acid, and citric acid. This study demonstrates a great potential of CNW based composite electrodes in nonenzymatic electrochemical sensor application.

Automated summary

Plasma-enhanced chemical vapor deposition in a CO/H-2 microwave discharge system was used to synthesize carbon nanowalls template, onto which manganese oxides were deposited using potentiostatic anodic deposition technique. The synthesized nanocomposite electrode exhibited high electrochemical activity for detecting hydrogen peroxide, showing high sensitivity and good selectivity. This study demonstrates the great potential of CNW-based composite electrodes in nonenzymatic electrochemical sensor applications.