Three-dimensional carbon nanotube-textile anode for high-performance microbial fuel cells

Area of Science:

• Electrochemistry
• Biotechnology
• Materials Science

Background:

• Microbial fuel cells (MFCs) convert chemical energy to electrical energy using microbial metabolism.
• Anode performance is a key limitation for MFC power density and practical application.
• Limited advancements in anode design hinder MFC performance enhancement.

Purpose of the Study:

• To develop a high-performance anode for MFCs.
• To enhance anode design for improved power density and energy recovery.
• To investigate the potential of carbon nanotube-textile composites in MFC applications.

Main Methods:

• Fabrication of a biocompatible, conductive, two-scale porous anode using a carbon nanotube-textile (CNT-textile) composite.
• Characterization of the anode's macroscale porous structure for substrate transport and microbial colonization.
• Evaluation of the microscale porous CNT layer's interaction with microbial biofilms for enhanced electron transfer.
• Comparison of MFC performance with CNT-textile anodes versus traditional carbon cloth anodes.

Main Results:

• The CNT-textile anode exhibits a 10-fold larger interfacial area compared to its projective surface area.
• The anode demonstrates a 10-fold lower charge-transfer resistance.
• MFCs with CNT-textile anodes achieved 157% higher maximum current density.
• Maximum power density increased by 68%, and energy recovery improved by 141%.

Conclusions:

• The developed CNT-textile composite anode significantly enhances MFC performance.
• The unique two-scale porous structure facilitates efficient microbial colonization and electron transfer.
• This anode design offers a promising pathway for high-performance microbial fuel cells.