Controlling for peak power extraction from microbial fuel cells can increase stack voltage and avoid cell reversal
Controlling for peak power extraction from microbial fuel cells can increase stack voltage and avoid cell reversal
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DOI：
10.1016/j.jpowsour.2014.06.059
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发表时间：
2014-12
影响因子：
9.2
通讯作者：
H. Boghani;G. Papaharalabos;I. Michie;K. Fradler;R. Dinsdale;A. Guwy;I. Ieropoulos;J. Greenman;G. Premier
中科院分区：
文献类型：
--
作者：
H. Boghani;G. Papaharalabos;I. Michie;K. Fradler;R. Dinsdale;A. Guwy;I. Ieropoulos;J. Greenman;G. Premier
微生物燃料电池（MFC）是一种生物电化学系统，可以降解有机材料，并且越来越被视为低碳技术的潜在贡献者，特别是在废水的能量回收和处理方面。 MFC 的理论最大开路电压约为 1.1 V，但会因过压损耗而大幅降低。电源的实际使用需要堆叠或其他方式来提高电压。 MFC 的串联堆叠通常会遇到工作条件和性能变化的情况，这会增加电池反转的风险，从而降低整体功率性能。 MFC 子系统串联连接和最大功率点跟踪 (MPPT) 的新颖策略可从各个 MFC 产生更大的功率，同时消除电池反转。当以正常串联方式与一个公共负载连接时，使用较低浓度底物的 MFC 会经历电压反转，但当 MFC 和负载串联在一起时，性能不佳的电池会被有效旁路，并可获得最大功率。结论是，使用混合连接和 MPPT 可以增加电池堆电压并避免电池反转。如果在处理实际废水时部署大规模阵列/模块，则该方法可能适合堆叠式 MFC 操作。
Microbial fuel cells (MFCs) are bioelectrochemical systems which can degrade organic materials and are increasingly seen as potential contributors to low carbon technologies, particularly in energy recovery from and treatment of wastewaters. The theoretical maximum open circuit voltage from MFCs lies in the region of 1.1 V, but is reduced substantially by overvoltage losses. Practical use of the power requires stacking or other means to increase voltage. Series stacking of MFCs with typically encountered variability in operating conditions and performance raises the risk of cell reversal, which diminishes overall power performance. A novel strategy of MFC subsystem series connectivity along with maximum power point tracking (MPPT) generates increased power from individual MFCs whilst eliminating cell reversal. MFCs fed with lower concentrations of substrate experienced voltage reversal when connected in normal series connection with one common load, but when MFCs and loads together were connected in series, the underperforming cell is effectively bypassed and maximum power is made available. It is concluded that stack voltage may be increased and cell reversal avoided using the hybrid connectivity along with MPPT. This approach may be suitable for stacked MFC operations in the event that large scale arrays/modules are deployed in treating real wastewaters.