Abstract: Five two-chamber mediator-less microbial fuel cells were connected in series and parallel forms of cell stacks. The performances of cell stacks were studied when MFCs were running in different stages and using different substrates and electron acceptors. The results showed that connection in series or parallel increased voltage and current, respectively. Using oxygen and hexacyanoferrate as the electron acceptors, the voltage of connection in series stack enabled the voltage up to 1.186 V at output power density of 18.83 mW/m2 and 1.417 V at 51.51 mW/m2, respectively, and output current of parallel stacked cells was 3 mA at output power density of 22.66 mW/m2, and 6.86 mA at 65.22 mW/m2. The difference of individual cells in stacks was the main reason to cause cell reversal, and the cell with larger internal resistance tended to be pole reversal at large working current. Reasonable hybrid connection of MFCs reduced the energy loss caused by the difference of MFCs in series stack, when external resistance was 30 W, the output power density of adopted hybrid connection stack (30.3 mW/m2) was around 4 times as that of series stacked MFCs (6.58 mW/m2).

Key words: microbial fuel cell, enrichment, series, parallel

摘要： 以5个双室直接微生物燃料电池构建串、并联电池组，考察了电池不同运行阶段及不同底物和电子受体对电池组性能的影响. 结果表明，串、并联微生物燃料电池组可以提高工作电压、电流. 以氧气和铁氰化钾作为电子受体时，串联电池组的输出电压(输出功率密度)分别可达1.186 V (18.83 mW/m2)和1.417 V (51.51 mW/m2)，并联电池组输出电流(输出功率密度)可达3 mA (22.66 mW/m2)和6.86 mA (65.22 mW/m2). 串联电池组中电池间的差异是出现电池反极的主要原因，内阻较大的电池易在工作电流较大时出现反极现象. 适宜的混联方式可以降低由内阻差异引起的能量损失，外电阻为30 W时，混联电池组输出功率密度(30.3 mW/m2)是串联电池组(6.58 mW/m2)的4倍.

关键词: 微生物燃料电池, 富集, 串联, 并联