Voltage Reversal during Stacking Microbial Fuel Cells with or without Diodes
Voltage Reversal during Stacking Microbial Fuel Cells with or without Diodes
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DOI：
10.4028/www.scientific.net/amr.396-398.188
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发表时间：
2011-11
期刊：
影响因子：
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通讯作者：
N. Zhu;Xi Chen;Lixing Tu;Ping-xiao Wu;Z. Dang
中科院分区：
文献类型：
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作者：
N. Zhu;Xi Chen;Lixing Tu;Ping-xiao Wu;Z. Dang
串联堆叠微生物燃料电池（MFC）可以提供更高的电压;然而，电压反转（VR）不利地影响堆叠MFC的性能。在本文中，二极管被引入到三个堆叠的MFC，以研究VR的行为，并提供一个基于二极管的VR的解释。结果表明，不同的叠层MFC系统均存在VR现象。与正向二极管（~0.37 V）连接的堆叠MFC的VR以与没有二极管（~0.80 V）的模式类似的模式发生。然而，它只发生在一个周期的结束。这可以分析为二极管的电阻消耗了一部分流动的电子，电极的电位变化速度减慢。相应地，在与反向二极管连接的堆叠MFC中，每个单元MFC的电压近似等于它们的开路电压（~ 0.75V），并且VR发生在仅在阴极端具有反向二极管的单元MFC中。这说明微生物燃料电池中电子的不平衡消耗和特定电极电位的变化是导致VR的直接原因。
Stacking microbial fuel cells (MFCs) in series can provide higher voltage; however, voltage reversal (VR) adversely affects performance of the stacked MFCs. In this paper, diodes are introduced into three stacked MFCs so as to investigate the VR behavior and offer a diodes-based explanation of the VR. The results show that VR occurs in the different stacked MFCs systems. VR of the stacked MFCs connected with forward diodes (～0.37 V) happens in a similar pattern as that without diodes (～0.80 V). However, it only happens at the end of a cycle. This can be analyzed that the resistance of the diodes consume a part of the flowing electrons and the speed of potential changes of the electrodes slows down. Differently, in the stacked MFCs connected with reverse diodes, the voltages of each unit MFC approximately equal their open circuit voltages (～0.75 V), and VR happens in the unit MFC with reverse diodes at the cathode end only. It implies that the imbalanced consumption of electrons in unit MFCs and the potential changes of specific electrode directly result in VR.