A Storage-Dependent Platinum Functionalization with a Commercial Pre-Polymer Useful for Hydrogen Peroxide and...

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Commercial product Chemiplus 2DS HB, an oligomer with sulfate/sulfone groups, was assessed for electrochemical properties.
• Pt electrode modification using Chemiplus 2DS HB was explored for sensor applications.
• Understanding the stability and performance of modified electrodes under various conditions is crucial.

Purpose of the Study:

• To evaluate the electrochemical properties of Chemiplus 2DS HB for electrode modification.
• To investigate the performance of Pt/Chemiplus 2DS HB sensors for detecting hydrogen peroxide and ascorbic acid.
• To examine the stability of the modified sensor under different storage conditions.

Main Methods:

• Cyclic voltammetry and constant potential amperometry were employed for electrode modification and characterization.
• Pt electrodes were modified with Chemiplus 2DS HB using constant potential amperometry.
• The electrochemical response of modified sensors to H₂O₂ and ascorbic acid was compared to unmodified Pt electrodes.

Main Results:

• Pt/Chemiplus 2DS HB sensors exhibited a significant change in oxidative currents for H₂O₂ and ascorbic acid compared to bare Pt.
• The modified sensor demonstrated effective rejection of ascorbic acid while retaining H₂O₂ oxidation capability after 7 days of storage in a specific solution.
• Sulfone and sulfonate groups are proposed to be responsible for the film's properties and selective rejection of ascorbic acid.

Conclusions:

• Pt/Chemiplus 2DS HB sensors show potential for selective detection of H₂O₂ by rejecting ascorbic acid.
• The unique self-blocking/self-rejection mechanism of ascorbic acid distinguishes this sensor from others.
• The stability of the sensor under storage conditions suggests practical applicability.