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Scaling up Microbial Fuel Cells

机译：扩大微生物燃料电池

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The goal of this study was to quantify the relation between the surface area of the current-limiting electrode of a microbial fuel cell (MFC) and the power density generated by the MFC. Shewanella oneidensis (MR-1) was grown anaerobically in the anodic compartment of an MFC utilizing lactate as the electron donor. Graphite plate electrodes of various sizes were used as anodes. Commercially available air electrodes, composed of manganese-based catalyzed carbon bonded to a current-collecting screen made of platinum mesh, were used as cathodes, and dissolved oxygen was used as the cathodic reactant The surface area of the cathode was always significantly larger than that of the anode, to ensure that the anode was the current-limiting electrode. The power density generated by the MFC decreased as the surface area of the anode increased, which fits well with the trend we detected comparing various published results. Thus, our findings bring into question the assertion thatthe overall power density generated by an MFC with large electrodes can be estimated by extrapolating from an electrode with a small surface area. Our results indicate that the maximum power density generated by an MFC is not directly proportional to the surface area of the anode, but is instead proportional to the logarithm of the surface area of the anode.
机译：这项研究的目的是量化微生物燃料电池（MFC）的限流电极的表面积与MFC产生的功率密度之间的关系。利用乳酸盐作为电子供体，在MFC的阳极室中厌氧生长希瓦氏菌（MR-1）。使用各种尺寸的石墨板电极作为阳极。将市售的空气电极（由锰基催化碳键合到由铂网制成的集流筛网组成）用作阴极，并使用溶解氧作为阴极反应物。阴极的表面积始终明显大于阳极，以确保阳极是限流电极。 MFC产生的功率密度随着阳极表面积的增加而降低，这与我们比较各种公开结果所检测到的趋势非常吻合。因此，我们的发现使人们质疑这样的说法，即大电极MFC产生的总功率密度可以通过从表面积较小的电极推断得出。我们的结果表明，MFC产生的最大功率密度与阳极的表面积不成正比，而与阳极的表面积的对数成正比。

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