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An implantable biofuel cell for a live insect.

Michelle Rasmussen¹, Roy E Ritzmann, Irene Lee

¹Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Journal of the American Chemical Society

|January 14, 2012

Summary

A novel biofuel cell using enzymes and osmium complexes was developed. This implantable device demonstrated stable power output in a cockroach model, showing potential for long-term bioenergy applications.

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Area of Science:

Biomedical Engineering
Electrochemistry
Biotechnology

Background:

Biofuel cells offer a sustainable energy source.
Enzyme-based electrodes enhance biofuel cell efficiency.
Osmium complexes serve as effective electron relays.

Purpose of the Study:

To design and construct a novel biofuel cell.
To evaluate the performance of a bienzymatic anode and a bilirubin oxidase cathode.
To assess the stability and power output of an implantable biofuel cell.

Main Methods:

A bienzymatic anode (trehalase|glucose oxidase) and a bilirubin oxidase cathode were constructed.
Osmium complexes grafted to a polymeric backbone were used as electron relays.
The biofuel cell was implanted in a female Blaberus discoidalis for performance testing.

Main Results:

The biofuel cell achieved a maximum specific power density of approximately 55 μW/cm(2) at 0.2 V.
The power output remained stable, decreasing by only about 5% after 2.5 hours of operation.
Successful implantation and operation within a living organism were demonstrated.

Conclusions:

The developed biofuel cell exhibits promising stable power generation capabilities.
The use of bienzymatic electrodes and osmium-based electron relays is effective.
This technology holds potential for implantable bioelectronic devices.