Voltage Reversal during Stacking Microbial Fuel Cells with or without Diodes
Neng Wu Zhu, Xi Chen, Li Xing Tu, Ping Xiao Wu +1
AI summary
70% confidenceStacking microbial fuel cells (MFCs) in series can provide higher voltage, but voltage reversal (VR) affects performance. Diodes were introduced to investigate VR behavior and its effects on stacked MFCs. Results show that VR occurs in different stacked MFC systems, with varying effects depending on diode type and placement.
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Abstract
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.
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Keywords
Identifiers
- Journal
- Advanced Materials Research
- Year
- 2011