带有蛇形流场的微生物燃料电池串联堆性能特性

Performance of stacking microbial fuel cell in series with serpentine flow fields

以四个成功启动的带有蛇形流场的单电池构造了微生物燃料电池串联堆(MFCS-S),测试了MFCS-S性能,探讨了其性能提升的限制因素,研究了增加反极电池阴、阳极电解液流量,采取混联的方式运行,移除反极电池和反接反极电池对电堆性能的影响。实验结果表明:MFCS-S在输出电压为2.11V时获得最大功率密度(2226mW·m-2);在一定电流条件下,性能较差的单电池发生电压反极,这是限制MFCS-S性能提高的主要原因;增加反极电池阴、阳极流量虽然不能较大幅度地改善单电池反极,但是却能大幅度提高电堆功率密度;采用混联方式运行不但可以有效避免电池反极,而且可以大幅度提高电堆功率密度;移除反极电池并不能有效地避免电池的反极,反接反极电池反而进一步加剧反极。

A stacking microbial fuel cell in series with serpentine flow field （MFCS-S） was constructed by using four started-up single microbial fuel cells. The performance of the MFCS-S was tested and several possible measures of improving MFCS-S performance were investigated. The experimental results showed that a maximal power density of 2226 mW · m 2 was observed at a high voltage of 2.11 V. A cell with low performance in MFCS-S would present a reversed voltage at a certain current density and then result in a low stack cell, which was the main limitation of further improving MFCS-S performance. Although large improvement is impossible for the voltage reverse, an increase in the flow rate of the anolyte and catholyte in MFC-R can result in a significant improvement for power output of MFCS-S. By using a hybrid connection, the voltage reverse would be avoided, resulting in a largely increased stack performance. However, the voltage reverse cannot be improved by removing the MFC-R and even got worse after switching it into reverse in the series circuit.