Ringeisen Bradley R, Henderson Emily, Wu Peter K, Pietron Jeremy, Ray Ricky, Little Brenda, Biffinger Justin C, Jones-Meehan Joanne M
Chemistry Division, Naval Research Laboratory, 4555 Overlook Avenue, SW, Washington, DC 20375, USA.
Environ Sci Technol. 2006 Apr 15;40(8):2629-34. doi: 10.1021/es052254w.
A miniature microbial fuel cell (mini-MFC) is described that demonstrates high output power per device cross-section (2.0 cm2) and volume (1.2 cm3). Shewanella oneidensis DSP10 in growth medium with lactate and buffered ferricyanide solutions were used as the anolyte and catholyte, respectively. Maximum power densities of 24 and 10 mW/m2 were measured using the true surface areas of reticulated vitreous carbon (RVC) and graphite felt (GF) electrodes without the addition of exogenous mediators in the anolyte. Current densities at maximum power were measured as 44 and 20 mA/m2 for RVC and GF, while short circuit current densities reached 32 mA/m2 for GF anodes and 100 mA/m2 for RVC. When the power density for GF was calculated using the cross sectional area of the device or the volume of the anode chamber, we found values (3 W/m2, 500 W/m3) similar to the maxima reported in the literature. The addition of electron mediators resulted in current and power increases of 30-100%. These power densities were surprisingly high considering a pure S. oneidensis culture was used. We found that the short diffusion lengths and high surface-area-to-chamber volume ratio utilized in the mini-MFC enhanced power density when compared to output from similar macroscopic MFCs.
本文描述了一种微型微生物燃料电池（mini-MFC），该电池在单位器件横截面积（2.0平方厘米）和体积（1.2立方厘米）下展现出高输出功率。分别使用含有乳酸的希瓦氏菌DSP10生长培养基和缓冲铁氰化物溶液作为阳极电解液和阴极电解液。在阳极电解液中不添加外源介导剂的情况下，使用网状玻璃碳（RVC）和石墨毡（GF）电极的真实表面积测得最大功率密度分别为24和10毫瓦/平方米。RVC和GF在最大功率下的电流密度分别为44和20毫安/平方米，而GF阳极的短路电流密度达到32毫安/平方米，RVC的短路电流密度达到100毫安/平方米。当使用器件的横截面积或阳极室的体积来计算GF的功率密度时，我们发现其值（3瓦/平方米，500瓦/立方米）与文献报道的最大值相似。添加电子介导剂使电流和功率增加了30 - 100%。考虑到使用的是纯希瓦氏菌培养物，这些功率密度出奇地高。我们发现，与类似的宏观MFC输出相比，mini-MFC中利用的短扩散长度和高表面积与腔室体积比提高了功率密度。
