Electricity generation by Rhodopseudomonas palustris DX-1

Defeng Xing, Yi Zuo, Shaoan Cheng, John M. Regan, Bruce E. Logan

Research output: Contribution to journalArticle

262 Scopus citations

Abstract

Bacteria able to generate electricity in microbial fuel cells (MFCs) are of great interest, but there are few strains capable of high power production in these systems. Here we report that the phototrophic purple nonsulfur bacterium Rhodopseudomonas palustris DX-1, isolated from an MFC, produced electricity at higher power densities (2720 ± 60 mW/m2) than mixed cultures in the same device. While Rhodopseudomonas species are known for their ability to generate hydrogen, they have not previously been shown to generate power in an MFC, and current was generated without the need for light or hydrogen production. Strain DX-1 utilizes a wide variety of substrates (volatile acids, yeast extract, and thiosulfate) for power production in different metabolic modes, making it highly useful for studying power generation in MFCs and generating power from a range of simple and complex sources of organic matter. These results demonstrate that a phototrophic purple nonsulfur bacterium can efficiently generate electricity by direct electron transfer in MFCs, providing another model microorganism for MFC investigations.

Original languageEnglish (US)
Pages (from-to)4146-4151
Number of pages6
JournalEnvironmental Science and Technology
Volume42
Issue number11
DOIs
StatePublished - Jun 1 2008

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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