矩形微生物燃料电池性能的分析

Analysis on a rectangular microbial fuel cell performance

摘要:

测试阳极液和阴极液的pH值和电导率的变化情况, 分析微生物燃料电池(MFC)的产电过程和能量利用情况, 为改善MFC的性能提供理论依据。试验结果表明: 随着MFC的运行, 阳极液的pH值和电导率呈现下降的趋势, 阴极液的pH值和电导率呈现上升的趋势, 阴极液的pH值比阳极液的pH值大约高0.30?0.50, 阳极液和阴极液的平均电导率变化不大。MFC稳定运行时, 欧姆内阻为29.69 Ω, 极限电流为2.69 mA, 最大输出功率约为0.8 mW, 对应的内阻约为95.72 Ω。铁氰化钾的质量传输是极限电流的限制性因素。能量分析发现, MFC阳极液中91.1%的葡萄糖被其他微生物消耗, 仅有8.9%的葡萄糖用来发电; 而用来发电的葡萄糖的88.5%的能量转化为其他形式的能量, 仅有11.5%的能量转化为电能。

Abstract:

The pH and ionic conductivity change of the anode and cathode solution was tested, and producing electricity process and energy utilization were analyzed to provide a theoretical basis for improving the MFC performance in this paper. Experimental results show as follows: The pH and ionic conductivity of the anode solution decreased, while that of the cathode solution increased with the MFC operation, and the latter was higher than the former by about 0.30?0.50 unit finally, while the average ionic conductivity of which changed slightly. When the MFC operated stably, the ohmic resistance was 29.69 Ω, the limiting current was 2.69 mA and the maximum power output was about 0.8 mW corresponding to the internal resistance of about 95.72 Ω. The mass transfer of potassium ferricyanide was the limiting factor of the limiting current. According to energy analysis, glucose of 91.1% in the anode solution was consumed by other microorganisms, and only glucose of 8.9% was used to generate electricity. Furthermore, the energy of 88.5% in the latter was converted into other forms, and only 11.5% of which was converted into electricity.