微生物燃料电池性能的影响因素研究

Study on the Influence Factors to the Performance of Microbial Fuel Cells

在微生物燃料电池中,氧化还原介体可以有效的促进电子从微生物细胞内传递到电池阳极上,提高电池的能量转化率。在不加介体情况下,普通变形菌电池性能优于大肠杆菌。对微生物和氧化还原介体的组合进行研究,结果显示,普通变形菌和硫堇的组合极化曲线趋于平坦,性能比较稳定,功率可达到128.8mW/m2。另外,在加入硫堇后,电池内阻由1724Ω降为200Ω,内阻降幅为88.4%。当0.25mmol/L Fe(Ⅲ)EDTA和0.5mmol/L硫堇混合时,功率可达169.3mW/m2,优于单介体微生物燃料电池。

In microbial fuel cells （MFC）, redox mediator can promote the transfer of electrons from microbes to the surface of electrode and enhance converting efficiency of energies. Proteus vulgaris to the performance of MFC is superior to E.coli without the mediator. The combinations of microbes and mediators were studied, and the results shown that the polarization curve of microbial fuel ceU with combination of proteus vulgaris and thionine was smooth and stable, the maximal output power reached 128.8mW/m^2. Otherwise, the interior resistance of MFC decreased from 1724ft to 200Ω within thionine, the percentage is 88.4%. The performances of MFCs with the combination of thionine and ferric chelates as co-mediators was better than that With single mediator, and the Output power reached 169.3mW/m^2 under the conditions of 0.25mmol/L ferric chelates and 0.5mmol/L thionine.