NDLI: Development and evaluation of carbon and binder loading in low-cost activated carbon cathodes for air-cathode microbial fuel cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, Guang Logan, Bruce E. Tokash, Justin C. Hickner, Michael A. Wei, Bin
Copyright Year	2012
Abstract	Activated carbon (AC) air cathodes were constructed using variable amounts of carbon (43–171 mg cm−2) and an inexpensive binder (10 wt% polytetrafluoroethylene, PTFE), and with or without a porous cloth wipe-based diffusion layer (DL) that was sealed with PDMS. The cathodes with the highest AC loading of 171 mg cm−2, and no diffusion layer, produced 1255 ± 75 mW m−2 and did not appreciably vary in performance after 1.5 months of operation. Slightly higher power densities were initially obtained using 100 mg cm−2 of AC (1310 ± 70 mW m−2) and a PDMS/wipe diffusion layer, although the performance of this cathode decreased to 1050 ± 70 mW m−2 after 1.5 months, and 1010 ± 190 mW m−2 after 5 months. AC loadings of 43 mg cm−2 and 100 mg cm−2 did not appreciably affect performance (with diffusion layers). MFCs with the Pt catalyst and Nafion binder initially produced 1295 ± 13 mW m−2, but the performance decreased to 930 ± 50 mW m−2 after 1.5 months, and then to 890 ± 20 mW m−2 after 5 months. Cathode performance was optimized for all cathodes by using the least amount of PTFE binder (10%, in tests using up to 40%). These results provide a method to construct cathodes for MFCs that use only inexpensive AC and a PTFE, while producing power densities similar to those of Pt/C cathodes. The methods used here to make these cathodes will enable further tests on carbon materials in order to optimize and extend the lifetime of AC cathodes in MFCs.
Starting Page	12751
Ending Page	12758
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	2
Issue Number	33
Journal	RSC Advances
DOI	10.1039/c2ra21572a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polytetrafluoroethylene Cathode Nafion Activated carbon X86 Paint Diffusion Carbon
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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