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Scalable, high performance, enzymatic cathodes based on nanoimprint lithography.

Dmitry Pankratov1, Richard Sundberg2, Javier Sotres3

  • 1Biomedical Sciences, Health and Society, Malmö University, 20560 Malmö, Sweden ; A.N. Bach Institute of Biochemistry, 119071 Moscow, Russia.

Beilstein Journal of Nanotechnology
|July 23, 2015
PubMed
Summary

We developed high-performance enzymatic electrodes for oxygen bio-electroreduction using nanoimprint lithography. Nanostructured electrodes show significantly enhanced current densities and operational stability compared to planar designs.

Keywords:
bilirubin oxidasebio-electrocatalysisdirect electron transfernanoimprint lithographyoxygen reduction reaction

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Area of Science:

  • Bioelectrochemistry
  • Nanotechnology
  • Enzyme Electrodes

Background:

  • Enzymatic electrodes are crucial for bioelectronic devices.
  • Developing high-performance and stable biocathodes remains a challenge.

Purpose of the Study:

  • To fabricate high-performance, enzymatically active electrodes for oxygen bio-electroreduction.
  • To investigate the impact of nanostructuring on electrode performance and stability.

Main Methods:

  • Fabrication of planar and nanostructured electrodes on flexible polymer sheets using nanoimprint lithography.
  • Immobilization of Myrothecium verrucaria bilirubin oxidase via direct physical adsorption.
  • Electrochemical characterization including open circuit voltage and current density measurements.

Main Results:

  • Achieved open circuit voltage of ~0.75 V.
  • Nanostructured electrodes exhibited higher current densities (up to 186 µA/cm²) compared to planar electrodes (up to 58 µA/cm²).
  • Half-deactivation times improved from 2 h for planar to 14 h for nanostructured electrodes.

Conclusions:

  • Nanoimprint lithography enables scalable fabrication of advanced bioelectronic devices.
  • Nanostructuring significantly enhances bio-electrocatalytic performance and operational stability.
  • Increased surface area and enzyme stabilization within nanocavities are key factors for improved performance.