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Peptide-mediated binding of gold nanoparticles to E. coli for enhanced microbial fuel cell power generation

  • Justin P. Jahnke (a1), Hong Dong (a1), Deborah A. Sarkes (a1), James J. Sumner (a1), Dimitra N. Stratis-Cullum (a1) and Margaret M. Hurley (a1)...

Abstract

The authors demonstrate that gold-binding peptides displayed on the outer membrane of Escherichia coli enhance bioelectrochemical charge transfer by binding gold nanoparticles. Microbial fuel cells were run with different gold-binding peptides displayed and with different nanoparticle sizes, and the results were correlated with transmission electron microscopy (TEM) imaging of nanoparticle binding. When a gold-binding peptide is displayed and 5 nm gold nanoparticles are present, up to 4× power generation over E. coli not displaying a gold-binding peptide is observed. While an enhanced current is observed using the previously published M6G9, the largest enhancement is observed when a new longer peptide named M9G18 is used.

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Corresponding author

Address all correspondence to Justin P. Jahnke at justin.p.jahnke.civ@mail.mil

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MRS Communications
  • ISSN: 2159-6859
  • EISSN: 2159-6867
  • URL: /core/journals/mrs-communications
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