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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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A biofuel cell with electrochemically switchable and tunable power output.

Eugenii Katz1, Itamar Willner

  • 1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Journal of the American Chemical Society
|May 29, 2003
PubMed
Summary

This study introduces an electroswitchable biofuel cell that uses glucose oxidation. The cell

Area of Science:

  • Bioelectrochemistry
  • Renewable Energy Technologies
  • Materials Science

Background:

  • Biofuel cells offer a sustainable alternative for energy generation.
  • Controlling biofuel cell performance electrochemically is crucial for practical applications.
  • Enzyme immobilization and redox mediator strategies are key to efficient biofuel cell design.

Purpose of the Study:

  • To develop an electroswitchable and tunable biofuel cell based on glucose oxidation.
  • To integrate redox mediators and enzymes onto conductive polymer films for enhanced performance.
  • To demonstrate reversible switching between ON and OFF states for biofuel cell operation.

Main Methods:

  • Fabrication of anode and cathode electrodes using Cu(2+)-poly(acrylic acid) films.

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  • Covalent linkage of pyrroloquinoline quinone (PQQ), flavin adenine dinucleotide (FAD), glucose oxidase (GOx), cytochrome c (Cyt c), and cytochrome oxidase (COx).
  • Electrochemical reduction and oxidation of polymer films to control conductivity and switch cell performance.

    • Main Results:

    • Achieved a short-circuit current of 105 microA (550 microA cm(-2)) and an open-circuit voltage of 120 mV.
    • Maximum extracted power of 4.3 microW at 1 kOmega external resistance.
    • Demonstrated reversible switching between ON and OFF states by cyclic electrochemical modulation of electrode conductivity.

    Conclusions:

    • The developed biofuel cell exhibits electroswitchable and tunable characteristics.
    • The slow reduction process of Cu(2+)-polymer films allows for fine-tuning of output power.
    • This work presents a promising platform for controllable biofuel cell technology.