Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, China.
Appl Microbiol Biotechnol. 2010 Jan;85(4):1141-9. doi: 10.1007/s00253-009-2259-2. Epub 2009 Sep 30.
Increasing the ionic strength of the electrolyte in a microbial fuel cell (MFC) can remarkably increase power output due to the reduction of internal resistance. However, only a few bacterial strains are capable of producing electricity at a very high ionic strength. In this report, we demonstrate a newly isolated strain EP1, belonging to Shewanella marisflavi based on polyphasic analysis, which could reduce Fe(III) and generate power at a high ionic strength of up to 1,488 mM (8% NaCl) using lactate as the electron donor. Using this bacterium, a measured maximum power density of 3.6 mW/m(2) was achieved at an ionic strength of 291 mM. The maximum power density was increased by 167% to 9.6 mW/m(2) when ionic strength was increased to 1,146 mM. However, further increasing the ionic strength to 1,488 mM resulted in a decrease in power density to 5.2 mW/m(2). Quantification of the internal resistance distribution revealed that electrolyte resistance was greatly reduced from 1,178 to 50 Omega when ionic strength increased from 291 to 1,488 mM. These results indicate that isolation of specific bacterial strains can effectively improve power generation in some MFC applications.
在微生物燃料电池（MFC）中增加电解质的离子强度可以显著提高功率输出，因为这会降低内阻。然而，只有少数几种细菌菌株能够在非常高的离子强度下产生电能。在本报告中，我们展示了一种新分离的菌株 EP1，它基于多相分析，属于 Shewanella marisflavi，能够在高达 1,488 mM（8% NaCl）的高离子强度下利用乳酸作为电子供体还原 Fe(III)并产生电能。使用这种细菌，在 291 mM 的离子强度下实现了 3.6 mW/m²的测量最大功率密度。当离子强度增加到 1,146 mM 时，最大功率密度增加了 167%，达到 9.6 mW/m²。然而，当离子强度进一步增加到 1,488 mM 时，功率密度降低到 5.2 mW/m²。对内部电阻分布的定量分析表明，当离子强度从 291 mM 增加到 1,488 mM 时，电解质电阻从 1,178 欧姆大幅降低到 50 欧姆。这些结果表明，分离特定的细菌菌株可以有效提高某些 MFC 应用中的发电效率。
