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Fully edible biofuel cells.

Itthipon Jeerapan1, Bianca Ciui, Ian Martin

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Researchers developed the first fully edible biofuel cell (BFC) using only food materials. This innovation enables self-powered ingestible biomedical devices and biosensors for health monitoring.

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Area of Science:

  • Biomedical Engineering
  • Sustainable Energy

Background:

  • Conventional biofuel cells (BFCs) often require non-biocompatible materials and external mediators.
  • There is a growing need for self-powered ingestible devices for biomedical applications.

Purpose of the Study:

  • To develop the first fully edible biofuel cell (BFC) using only biocompatible food materials.
  • To explore the potential of edible BFCs for powering ingestible biomedical devices and biosensors.

Main Methods:

  • Constructed edible BFCs using pastes made from mushroom, apple, plum, banana extracts, activated charcoal, and vegetable oils.
  • Utilized intrinsic biocatalytic activity of mushroom for ethanol oxidation (anode) and apple extract for oxygen reduction (cathode).
  • Tested BFC performance, including power density, open circuit voltage (OCV), and stability.

Main Results:

  • Achieved a power density of 282 μW cm⁻² and an OCV of 0.24 V with a mushroom/apple/olive oil-based BFC.
  • Demonstrated linear proportionality between power/OCV signals and ethanol levels, indicating potential for alcohol sensing.
  • Maintained over 80% of initial power performance for four hours, showing good stability.

Conclusions:

  • Edible BFCs can be successfully fabricated using readily available food materials without external mediators or membranes.
  • These food-based BFCs show promise for powering ingestible devices and developing self-powered biosensors for health monitoring.
  • The developed BFCs offer a sustainable and biocompatible energy-harvesting solution for next-generation biomedical technologies.