Electroactive biofilms of sulphate reducing bacteria

Cristina M. Cordas, L. Tiago Guerra, Catarina Xavier, José J. G. Moura

Research output: Contribution to journalConference articlepeer-review

51 Citations (Scopus)

Abstract

Biofilms formed from a pure strain of Desulfovibrio desulfuricans 27774 on stainless steel and graphite polarised surfaces were studied. The polarisation conditions applied were -0.4 V vs. SCE for different times. A cathodic current related with the biofilms growth was observed with a maximum intensity of -270 mA m-2 that remained stable for several days using graphite electrodes. These sulphate reducing bacteria biofilms present electrocatalytic activity towards hydrogen and oxygen reduction reactions. Electrode polarisation has a selective effect on the catalytic activity. The biofilms were also observed by scanning electronic microscopy revealing the formation of homogeneous films on the surfaces.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalElectrochimica Acta
Volume54
Issue number1(SI)
DOIs
Publication statusPublished - 1 Dec 2008
EventInternational conference on biocorrosion of materials, BIOCORYS 2007 - Paris, Portugal
Duration: 14 Jun 200717 Jun 2007

Keywords

  • Biofilms
  • Electrocatalysis
  • Electrochemistry
  • Hydrogenase
  • Sulphate reducing bacteria

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