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An oxygen-reducing biocathode with "oxygen tanks".

Xinxin Xiao1, Dónal Leech2, Jingdong Zhang1

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Polytetrafluoroethylene submicro-rods enhance Os redox polymer cathodes for bilirubin oxidase. This improves oxygen reduction reaction performance and stability in neutral pH conditions.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biocatalysis

Background:

  • Os redox polymers are crucial for enzyme-based cathodes.
  • Efficient oxygen reduction is vital for biosensor performance.
  • Neutral pH operation is desirable for biological applications.

Purpose of the Study:

  • To investigate the effect of polytetrafluoroethylene (PTFE) submicro-rods on Os redox polymer-based bilirubin oxidase cathodes.
  • To enhance the limiting current density and operational stability of these cathodes.

Main Methods:

  • Incorporation of PTFE submicro-rods into Os redox polymer matrices.
  • Electrochemical characterization of bilirubin oxidase cathodes.
  • Testing of oxygen reduction reaction performance in neutral pH.

Main Results:

  • PTFE submicro-rods acted as "oxygen tanks" and binders.
  • Enhanced limiting current density for the oxygen reduction reaction was observed.
  • Improved operational stability of the cathodes over 16 hours.

Conclusions:

  • PTFE submicro-rods effectively improve the performance of Os redox polymer-based bilirubin oxidase cathodes.
  • The addition of PTFE offers a promising strategy for developing stable and efficient biosensors.