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Minimum interspatial electrode spacing to optimize air-cathode microbial fuel cell operation with a membrane electrode assembly.

Authors
  • Moon, Jung Mi1
  • Kondaveeti, Sanath1
  • Lee, Tae Ho2
  • Song, Young Chae3
  • Min, Booki4
  • 1 Department of Environmental Science and Engineering, Kyung Hee University, 1 Seocheon-dong, Yongin-si, Gyeonggi-do 446-701, Republic of Korea. , (North Korea)
  • 2 Department of Civil and Environmental Engineering, Pusan National University, Busan 609-735, Republic of Korea. , (North Korea)
  • 3 Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan 606-709, Republic of Korea. , (North Korea)
  • 4 Department of Environmental Science and Engineering, Kyung Hee University, 1 Seocheon-dong, Yongin-si, Gyeonggi-do 446-701, Republic of Korea. Electronic address: [email protected] , (North Korea)
Type
Published Article
Journal
Bioelectrochemistry (Amsterdam, Netherlands)
Publication Date
December 2015
Volume
106
Issue
Pt B
Pages
263–267
Identifiers
DOI: 10.1016/j.bioelechem.2015.07.011
PMID: 26286838
Source
Medline
Keywords
License
Unknown

Abstract

An optimum electrode spacing of less than 1cm was determined for an air cathode microbial fuel cell (MFC) with a membrane electrode assembly (MEA) system. The lag period decreased as the electrode spacing increased and the voltage generation increased. Stable power density increased from 93 mW/m(2) to 248 mW/m(2) when the electrode distance increased from 0mm to 9 mm. In the polarization test, a maximum power density (400 mW/m(2)) was obtained at a distance of 6mm. The oxygen mass transfer coefficient (KO=4.60×10(-5) cm/s) with a 0mm spacing was five times higher than that at a 9 mm spacing (0.89×10(-5) cm/s). Long-term operation of the MFC exhibited relatively stable anode potentials of -285±25 (0 mm) and -517±20 mV (3, 6, and 9 mm) and a gradual decrease in cathode potential for all distances, especially with 0-mm spacing. The performance of air cathode MFCs can be improved using minimum electrode spacing rather than no spacing.

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