An electrochemical biosensor for ascorbic acid based on carbon-supported PdNi nanoparticles

Area of Science:

• Nanomaterials Science
• Electrochemistry
• Analytical Chemistry

Background:

• Ascorbic acid (AA) is a vital biomolecule with numerous applications.
• Efficient and selective detection of AA is crucial for various analytical and biomedical purposes.
• Development of advanced electrocatalysts is key to improving biosensor performance.

Purpose of the Study:

• To synthesize and characterize novel carbon-supported palladium-nickel nanoparticles (PdNi/C).
• To evaluate the electrocatalytic performance of PdNi/C for ascorbic acid (AA) oxidation.
• To assess the potential of PdNi/C as a sensing material for AA quantification.

Main Methods:

• Synthesis of PdNi/C nanoparticles via a novel route.
• Characterization using transmission electron microscopy (TEM) and X-ray diffractometry (XRD).
• Electrochemical evaluation of PdNi/C modified glassy carbon electrode (GCE) for AA oxidation.

Main Results:

• Uniform distribution of 10% (w/w) PdNi on the carbon black matrix.
• Enhanced electrocatalytic activity for AA oxidation compared to commercial Pd/C.
• Negative shift in AA oxidation potential to -0.05 V.
• Wide linear range (1.0×10(-5)M to 1.8×10(-3)M) and low detection limit (0.5 μM) for AA.
• Demonstrated fast response, high reproducibility, and stability.

Conclusions:

• PdNi/C nanomaterials exhibit excellent ascorbic acid sensing capabilities.
• The developed PdNi/C material shows great promise for accurate AA quantification in real samples.
• Pd-based bimetallic catalysts are highly suitable for amperometric sensing applications.