Self-Powered Biosensor Driven by a Hybrid Biofuel Cell with CuCoP-Polyoxometallate Composite as Both Cathode Catalyst...

Area of Science:

• Biomedical Engineering
• Electrochemistry
• Nanotechnology

Background:

• Abnormal hydrogen peroxide (H2O2) levels are linked to cellular toxicity and various diseases.
• Conventional biosensors often rely on unstable and costly bioenzymes.
• There is a need for stable, cost-effective H2O2 monitoring systems.

Purpose of the Study:

• To develop a self-powered miniaturized biosensor (SPB) for H2O2 detection.
• To minimize reliance on unstable bioenzymes by employing an enzyme-free cathode.
• To create a cost-effective and stable biosensing platform.

Main Methods:

• Constructed an enzyme biofuel cell-based SPB.
• Prepared a polydopamine (PDA)-gold nanoparticle (AuNP) composite as an anodic catalyst scaffold for glucose oxidase immobilization.
• Synthesized a CuCoP-PW12 composite as an abiotic cathodic catalyst for H2O2 reduction.

Main Results:

• The SPB demonstrated high catalytic activity for H2O2 reduction.
• Achieved two linear ranges for H2O2 detection (2–20 µm and 20–50 µm).
• Obtained a low detection limit of 0.0589 µm for H2O2.

Conclusions:

• The developed SPB offers a stable and cost-effective alternative to traditional biosensors.
• The synergistic effect between the bioanode and abiotic cathode enhances H2O2 detection.
• The SPB shows significant potential for effective application in biomedical sensing.