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Researchers applied electrical stress to a Texcoco soil community to enrich it with anode-respiring bacteria (ARB) for microbial fuel cell applications, resulting in a significant increase in current and power density.

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What they did

System
MFC

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Abstract

Anode-respiring bacteria (ARB) perform an unusual form of respiration in which their electron acceptor is a solid anode. The focus of this study was to characterize the electrical stress direct evolution of biocatalysts as a way of enriching the community with ARB for microbial fuel cell. We gave the electrical stress continually to the Texcoco bacterial community at -150mV/SCE. The 4th day current started to increase and attained the maximum current of 0.35mA in the 15 th day. The current in this period was associated to biofilm growth. On the 15thday and by using cyclic voltammetery, an irreversible electron transfer reaction of alkaliphilic cytochrome was found, due to the electrode fouling. From the impedance measurement, the biofilm ARB resistance was determined (~250Ω). Further confocal microscopy studies of biofilm ARB revealed ~6µm thickness. In the single chamber microbial fuel cell, the electrochemical stressed biofilm-ARB exhibited a maximum power density of 79mW/m²

Key findings

  • The electrical stress at -150mV/SCE increased the current to 0.35mA on the 15th day, associated with biofilm growth.
  • An irreversible electron transfer reaction was found due to electrode fouling on the 15th day.
  • The biofilm ARB resistance was determined to be ~250Ω, and the biofilm thickness was ~6µm.

Keywords

Microbial fuel cellBiofilmAnodeElectron acceptorMicrobial population biologyChemical engineering

Identifiers

DOI
10.1149/1.3660593
Journal
ECS Transactions
Year
2011