Journal
JOURNAL OF POWER SOURCES
Volume 272, Issue -, Pages 895-899Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.09.008
Keywords
Microbial fuel cells; Quaternary ammonium compounds; Biofilm inhibition; Anion transfer
Funding
- MOE Innovative Research Team in University [IRT13024]
- National Natural Science Foundation of China (NSFC) [51208352, 21107053]
- Tianjin Research Program of Application Foundation and Advanced Technology [13JCQNJC09100, 13JCQNJC08000]
- Independent Innovation Research Fund of Tianjin University [2014XRG-0095]
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The slow diffusion of hydroxyl out of the catalyst layer as well as the biofouling on the surface of cathode are two problems affecting power for membrane-less air-cathode microbial fuel cells (MFCs). In order to solve both of them simultaneously, here we simply modify activated carbon air-cathode using a bifunctional quaternary ammonium compound (QAC) by forced evaporation. The maximum power density reaches 1041 +/- 12 mW m(-2) in an unbuffered medium (0.5 g L-1 NaCl), which is 17% higher than the control, probably due to the accelerated anion transport in the catalyst layer. After 2 months, the protein content reduced by a factor of 26 and the power density increases by 33%, indicating that the QAC modification can effectively inhibit the growth of cathodic biofilm and improve the stability of performance. The addition of NaOH and QAC epoxy have a negative effect on power production due to the clogging of pores in catalyst layer. (C) 2014 Elsevier B.V. All rights reserved.
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