Dec 3, 2014

Improving the performance of a biofuel cell cathode with laccase-containing culture supernatant from Pycnoporus sanguineus

Bioresource Technology
Oleksandra FokinaReinhard Fischer

Abstract

Laccases are multicopper oxidoreductases that can be used in biofuel cells to improve cathode performance by cathodic oxygen reduction. Here we present a laccase from the ligninolytic white-rot fungus Pycnoporus sanguineus that, in contrast to the Trametes versicolor laccase, can be produced in the absence of inducers in a standard culture medium. After 7days of cultivation the activity of this laccase in culture supernatant reached 2.5U/ml, which is high enough for direct application of the supernatant in biofuel cells. The highest current density of 115.0±3.5μA/cm(2) at 400mV vs. SCE was obtained at pH 5 with a buckypaper cathode with a laccase-containing culture supernatant. The enzyme also showed electrocatalytic activity at pH 6 and 7. These results not only present a new cost-efficient laccase for improving cathode performance, but also show that new laccases with different catalytic properties can be suitable for biofuel cells.

  • References20
  • Citations5

References

Mentioned in this Paper

Tetragnatha versicolor
Dioxygen
Enzymes, antithrombotic
Lignin peroxidase
Trametes cinnabarina
Filamentous fungus
Tachigali versicolor
Electron Transport
Tromethamine
Laccase B

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