Template-Assisted Electrodeposited Copper Nanostructres for Selective Detection of Hydrogen Peroxide

Area of Science:

• Electrochemistry
• Nanomaterials Science
• Analytical Chemistry

Background:

• Developing sensitive and selective electrochemical sensors is crucial for detecting analytes like hydrogen peroxide.
• Modifying electrode surfaces with nanomaterials can enhance their catalytic and sensing capabilities.
• Pencil graphite electrodes (PGEs) offer a cost-effective and accessible platform for electrochemical applications.

Purpose of the Study:

• To demonstrate the electrodeposition of copper nanoparticles (NPs) on PGEs using sodium dodecyl sulphate (SDS) as a soft template.
• To investigate the impact of SDS on the morphology and electrochemical properties of the modified electrodes.
• To evaluate the performance of the prepared electrodes for the sensitive and selective detection of hydrogen peroxide (H2O2).

Main Methods:

• Electrodeposition of copper nanoparticles onto pencil graphite electrodes in the presence of sodium dodecyl sulphate.
• Characterization of the morphology and surface properties of the modified electrodes.
• Electrochemical measurements for hydrogen peroxide reduction using the modified electrodes.

Main Results:

• Hierarchical dendritic structures of copper NPs were formed on Cu-SDS/PGE, increasing surface area and catalytic activity compared to Cu/PGE.
• The Cu-SDS/PGE electrode exhibited excellent catalytic activity for hydrogen peroxide reduction.
• High sensitivity (21.42 µA/µM/cm2), a low limit of detection (0.35 µM), and rapid response (<2 s) were achieved for H2O2 detection over a wide concentration range (1 µM to 1 mM).
• The electrode demonstrated high selectivity for H2O2 with minimal interference from other analytes.

Conclusions:

• The developed Cu-SDS/PGE electrode provides a rapid (5 min preparation, 10 min analysis), cost-effective, and sensitive platform for hydrogen peroxide detection.
• The use of SDS as a soft template effectively enhances the electrochemical performance of copper nanoparticle-modified electrodes.
• This approach offers a promising alternative for the quantitative determination of hydrogen peroxide without complex procedures.