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Carbon nanotube forest modification of anode material in MFCs increases power density and stability of electricity generation performance.

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What they did

System
MFC

What worked

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Abstract

Abstract Carbon nanotube forest (CNTFs) is grown vertically on the surface of highly conductive mesophase pitch carbon fibers (Pitch‐CFs) in the chemical vapor deposition method. Then the CNTFs‐modified CFs (CNTFs‐Pitch‐CF) as an anode material is assembled into the single chamber microbial fuel cells (MFCs). Interaction between electricigens and carbon nanotubes (CNTs) is investigated. The toxicity of the CNTs can make electricigens expend energy or electrons to produce exopolysaccharid (EPS) as much as possible. Accordingly, this leads to low voltage and the long start up time for the CNTFs‐Pitch‐CF anode in the early period. When the activity of electricigens with the EPS reaches a stable state over time, the output voltage rises rapidly and the maximum power density of the CNTFs‐Pitch‐CF‐equiped MFC is increased to 1112 mW/m 2 , which is approximately 1.55‐fold higher than Pitch‐CF‐equiped MFC. And the CNTFs‐Pitch‐CF‐equiped MFC can keep high electricity generation performance of MFCs for a long time, which is 75 % larger than the Pitch‐CF‐equiped MFC. This method of the CNTFs modifying the CFs provides a new idea for increasing the electricity generation performance of the MFCs.

Key findings

  • CNTFs-Pitch-CF anode exhibits low voltage and long start-up time in early period due to electricigen toxicity.
  • Output voltage rises rapidly and maximum power density increases to 1112 mW/m² after electricigen activity stabilizes.
  • CNTFs-Pitch-CF-equipped MFC maintains high electricity generation performance for longer duration compared to Pitch-CF-equipped MFC.

Keywords

Carbon nanotubeAnodeElectricity generationMicrobial fuel cellCathodeCarbon fibers

Identifiers

DOI
10.1002/ente.201800377
Journal
Energy Technology
Year
2018