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Issue 6, 2011
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A μL-scale micromachined microbial fuel cell having high power density

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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 16 000 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.

Graphical abstract: A μL-scale micromachined microbial fuel cell having high power density

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Article information


Submitted
12 Oct 2010
Accepted
14 Jan 2011
First published
11 Feb 2011

Lab Chip, 2011,11, 1110-1117
Article type
Paper

A μL-scale micromachined microbial fuel cell having high power density

S. Choi, H. Lee, Y. Yang, P. Parameswaran, C. I. Torres, B. E. Rittmann and J. Chae, Lab Chip, 2011, 11, 1110
DOI: 10.1039/C0LC00494D

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