Wettability-regulated extracellular electron transfer from the living organism of Shewanella loihica PV-4

Chun-mei Ding, Mei-ling Lv, Ying Zhu, Lei Jiang, Huan Liu

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Abstract

C-type cytochromes located on the outer membrane (OMCs) of genus Shewanella act as the main redox-active species to mediate extracellular electron transfer (EET) from the inside of the outer membrane to the external environment: the central challenge that must be met for successful EET. The redox states of OMCs play a crucial role in dictating the rate and extent of EET. Here, we report that the surface wettability of the electrodes strongly influences the EET activity of living organisms of Shewanella loihica PV-4 at a fixed external potential: the EET activity on a hydrophilic electrode is more than five times higher than that on a hydrophobic one. We propose that the redox state of OMCs varies significantly at electrodes with different wettability, resulting in different EET activities.

Original languageEnglish
Pages (from-to)1446-1451
Number of pages6
JournalAngewandte Chemie - International Edition
Volume54
Issue number5
DOIs
Publication statusPublished - 26 Jan 2015
Externally publishedYes

Keywords

  • Cytochromes
  • Electrochemistry
  • Electron transfer
  • Microbes
  • Wettability

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