A highly sensitive hydrogen peroxide amperometric sensor based on MnO2-modified vertically aligned multiwalled carbon...

Area of Science:

• Electrochemistry
• Nanomaterials Science
• Analytical Chemistry

Background:

• Hydrogen peroxide (H(2)O(2)) is a crucial analyte in biological and industrial processes.
• Development of sensitive and selective sensors is vital for accurate H(2)O(2) determination.
• Vertically aligned multiwalled carbon nanotubes (VACNTs) offer excellent electrochemical properties.

Purpose of the Study:

• To fabricate a highly sensitive amperometric sensor for H(2)O(2) detection.
• To utilize MnO(2)-modified VACNTs (MnO(2)/VACNTs) as the sensing material.
• To investigate the electrochemical performance and practical applicability of the developed sensor.

Main Methods:

• Fabrication of MnO(2)/VACNTs nanocomposite via electrodeposition.
• Characterization using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction.
• Electrochemical analysis including cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy.

Main Results:

• The MnO(2)/VACNTs nanocomposite electrode demonstrated high sensitivity (1.08 x 10(6) microA M(-1) cm(-2)) and a low detection limit (8.0 x 10(-7) M) for H(2)O(2).
• A wide linear range (1.2 x 10(-6) M to 1.8 x 10(-3) M) was observed for H(2)O(2) determination.
• The sensor exhibited excellent resistance to common interfering substances and was successfully applied to H(2)O(2) determination in milk.

Conclusions:

• The developed MnO(2)/VACNTs nanocomposite electrode is a highly effective platform for sensitive H(2)O(2) detection.
• The sensor's robustness and accuracy indicate its potential for practical applications in H(2)O(2) analysis.
• This work highlights the synergistic benefits of combining MnO(2) and VACNTs for electrochemical sensing.