Highly sensitive and stable fructose self-powered biosensor based on a self-charging biosupercapacitor.

Area of Science:

• Electrochemistry
• Biosensors
• Energy Storage

Background:

• Developing sensitive and stable self-powered biosensors is crucial for real-time monitoring.
• Enzymatic fuel cells and biosupercapacitors offer potential for portable sensing platforms.

Purpose of the Study:

• To present an alternative approach for a highly sensitive and stable self-powered biosensor.
• To demonstrate D-fructose detection using a self-charging biosupercapacitor (BSC) platform.

Main Methods:

• A two-step process involving self-charging the BSC with D-fructose as fuel.
• Utilizing stored charge to detect D-fructose via polarization curves at varying concentrations.

Main Results:

• The proposed BSC achieved an instantaneous power density of 17.6 mW cm⁻² (pulse mode) and 3.8 mW cm⁻² (constant load).
• Self-charging BSC demonstrated up to 10x enhanced sensitivity compared to continuous operation and 100x compared to enzymatic fuel cells.
• Achieved sensitivity of 3.82 ± 0.01 mW cm⁻² mM⁻¹ with a 70-minute charging time.

Conclusions:

• The developed platform provides a highly sensitive and stable self-powered biosensor.
• The self-charging capability significantly enhances detection sensitivity.
• Potential applications in food analysis and biomedical diagnostics were highlighted.