Power generation using an activated carbon and metal mesh cathode in a microbial fuel cell

An inexpensive activated carbon (AC) air cathode was developed as an alternative to a platinum-catalyzed electrode for oxygen reduction in a microbial fuel cell (MFC). AC was cold-pressed with a polytetrafluoroethylene (PTFE) binder to form the cathode around a Ni mesh current collector. This cathode construction avoided the need for carbon cloth or a metal catalyst, and produced a cathode with high activity for oxygen reduction at typical MFC current densities. Tests with the AC cathode produced a maximum power density of 1220 mW/m 2 (normalized to cathode projected surface area; 36 W/m 3 based on liquid volume) compared to 1060 mW/m 2 obtained by Pt catalyzed carbon cloth cathode. The Coulombic efficiency ranged from 15% to 55%. These findings show that AC is a cost-effective material for achieving useful rates of oxygen reduction in air cathode MFCs.

[1]  B. Logan,et al.  Graphite fiber brush anodes for increased power production in air-cathode microbial fuel cells. , 2007, Environmental science & technology.

[2]  Bruce E Logan,et al.  Ion exchange membrane cathodes for scalable microbial fuel cells. , 2008, Environmental science & technology.

[3]  C. Buisman,et al.  Towards practical implementation of bioelectrochemical wastewater treatment. , 2008, Trends in biotechnology.

[4]  Stefano Freguia,et al.  Microbial fuel cells: methodology and technology. , 2006, Environmental science & technology.

[5]  Bruce E. Logan,et al.  Increased performance of single-chamber microbial fuel cells using an improved cathode structure , 2006 .

[6]  Willy Verstraete,et al.  Microbial fuel cells operated with iron-chelated air cathodes , 2009 .

[7]  Keith Scott,et al.  Microbial fuel cell performance with non-Pt cathode catalysts , 2007 .

[8]  Hong Liu,et al.  Power densities using different cathode catalysts (Pt and CoTMPP) and polymer binders (nafion and PTFE) in single chamber microbial fuel cells. , 2006, Environmental science & technology.

[9]  Jurg Keller,et al.  Non-catalyzed cathodic oxygen reduction at graphite granules in microbial fuel cells , 2007 .

[10]  L. T. Angenent,et al.  Application of Bacterial Biocathodes in Microbial Fuel Cells , 2006 .

[11]  W. Verstraete,et al.  Microbial fuel cells: novel biotechnology for energy generation. , 2005, Trends in biotechnology.

[12]  B. Logan.  Exoelectrogenic bacteria that power microbial fuel cells , 2009, Nature Reviews Microbiology.

[13]  Bruce E. Logan,et al.  Scale-up of membrane-free single-chamber microbial fuel cells , 2008 .

[14]  Derek R. Lovley,et al.  Bug juice: harvesting electricity with microorganisms , 2006, Nature Reviews Microbiology.

[15]  F. Harnisch,et al.  Challenges and constraints of using oxygen cathodes in microbial fuel cells. , 2006, Environmental science & technology.

[16]  Hong Liu,et al.  Electricity generation using an air-cathode single chamber microbial fuel cell in the presence and absence of a proton exchange membrane. , 2004, Environmental science & technology.

[17]  Bruce E Logan,et al.  Tubular membrane cathodes for scalable power generation in microbial fuel cells. , 2007, Environmental science & technology.

[18]  Li Zhuang,et al.  Membrane-less cloth cathode assembly (CCA) for scalable microbial fuel cells. , 2009, Biosensors & bioelectronics.

[19]  Bruce E. Logan,et al.  Microbial Fuel Cells , 2006 .