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The study found that Geobacter metallireducens nanowires enhance electron transfer efficiency and electrochemical activity in microbial fuel cells, increasing maximum output voltage and current response signals.

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What they did

System
MFC

What worked

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Abstract

Abstract The inhibitory effect of electron mediator 2,6-anthraquinone disulphonate (AQDS) on Geobacter metallireducens nanowire in the microbial fuel cell (MFC) was studied. In the culture process of G.metallireducens with Fe(OH) 3 as an electron acceptor, the concentration of reduction product Fe (II) in solution without AQDS was higher than that with AQDS after 10 days, due to the formation of microbial nanowires. The effects of nanowire on electron transfer efficiency and electrical current characteristic were studied using a double chamber MFC reactor. The transfer efficiency between biofilm and electrodes was increased by nanowire, which increased the maximum output voltage of MFC was 442 mV. The nanowire biofilm electrode had a bigger cyclic voltammetry curve peak, smaller activation resistance, and a stronger current response signal through electrochemical measurement, which indicates that the nanowire enhanced the electrochemical activity of the electrode.

Key findings

  • The presence of nanowires increased electron transfer efficiency between biofilm and electrodes.
  • The maximum output voltage of the MFC increased to 442 mV with nanowires.
  • Nanowires enhanced electrochemical activity, as indicated by cyclic voltammetry curve peaks and activation resistance.

Keywords

NanowireMicrobial fuel cellElectron transferElectrochemistryElectrodeCyclic voltammetry

Identifiers

DOI
10.1101/2021.07.14.452433
Journal
bioRxiv (Cold Spring Harbor Laboratory)
Year
2021