Abstract

We report a MEMS (Micro-Electro-Mechanical Systems)-based microbial fuel cell (MFC) that produces a high power density. The MFC features 4.5-μL anode/cathode chambers defined by 20-μm-thick photo-definable polydimethylsiloxane (PDMS) films. The MFC uses a Geobacter-enriched mixed bacterial culture, anode-respiring bacteria (ARB) that produces a conductive biofilm matrix. The MEMS MFC generated a maximum current density of 16000 μA cm-3 (33 μA cm-2) and power density of 2300 μW cm-3 (4.7 μW cm-2), both of which are substantially greater than achieved by previous MEMS MFCs. The coulombic efficiency of the MEMS MFC was at least 31%, by far the highest value among reported MEMS MFCs. The performance improvements came from using highly efficient ARB, minimizing the impact of oxygen intrusion to the anode chamber, having a large specific surface area that led to low internal resistance.

Original languageEnglish (US)
Pages (from-to)1110-1117
Number of pages8
JournalLab on a Chip - Miniaturisation for Chemistry and Biology
Volume11
Issue number6
DOIs
StatePublished - Mar 21 2011

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Bioelectric Energy Sources
Micro-Electrical-Mechanical Systems
Microbial fuel cells
Electrodes
Anodes
Bacteria
Geobacter
Biofilms
Polydimethylsiloxane
Specific surface area
Cathodes
Current density
Oxygen

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

A μl-scale micromachined microbial fuel cell having high power density. / Choi, Seokheun; Lee, Hyung Sool; Yang, Yongmo; Parameswaran, Prathap; Torres, Cesar; Rittmann, Bruce; Chae, Junseok.

In: Lab on a Chip - Miniaturisation for Chemistry and Biology, Vol. 11, No. 6, 21.03.2011, p. 1110-1117.

Research output: Contribution to journalArticle

Choi, Seokheun ; Lee, Hyung Sool ; Yang, Yongmo ; Parameswaran, Prathap ; Torres, Cesar ; Rittmann, Bruce ; Chae, Junseok. / A μl-scale micromachined microbial fuel cell having high power density. In: Lab on a Chip - Miniaturisation for Chemistry and Biology. 2011 ; Vol. 11, No. 6. pp. 1110-1117.
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