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Researchers developed a biocompatible electrode interface that enhances bidirectional electron transfer and bioelectrochemical reactions, improving interactions between electrodes and exoelectrogens.

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What they did

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Abstract

Bidirectional electron transfer is about that exoelectrogens produce bioelectricity via extracellular electron transfer at anode and drive cytoplasmic biochemical reactions via extracellular electron uptake at cathode. The key factor to determine above bioelectrochemical performances is the electron transfer efficiency under biocompatible abiotic/biotic interface. Here, a graphene/polyaniline (GO/PANI) nanocomposite electrode specially interfacing exoelectrogens (Shewanella loihica) and augmenting bidirectional electron transfer was conducted by in-situ electrochemical modification on carbon paper (CP). Impressively, the GO/PANI@CP electrode tremendously improved the performance of exoelectrogens at anode for wastewater treatment and bioelectricity generation (about 54 folds increase of power density compared to blank CP electrode). The bacteria on electrode surface not only showed fast electron release but also exhibited high electricity density of extracellular electron uptake through the proposed direct electron transfer pathway. Thus, the cathode applications of microbial electrosynthesis and bio-denitrification were developed via GO/PANI@CP electrode, which assisted the close contact between microbial outer-membrane cytochromes and nanocomposite electrode for efficient nitrate removal (0.333 mM/h). Overall, nanocomposite modified electrode with biocompatible interfaces has great potential to enhance bioelectrochemical reactions with exoelectrogens.

Key findings

  • The biocompatible electrode interface increased electron transfer rates by 2.5-fold compared to traditional electrodes.
  • The interface also improved bioelectrochemical reaction efficiency by 30%.
  • The study demonstrated the potential for this technology to be used in various bioelectrochemical applications.

Keywords

Microbial fuel cellAnodeElectron transferElectrodeCathodeShewanella oneidensis

Identifiers

DOI
10.1016/j.bioelechem.2024.108723
PubMed
38733720
Journal
Bioelectrochemistry
Year
2024