Analysis of voltage reversal during Microbial Fuel Cells stacked in serial

Microbial Fuel Cells (MFCs) are regarded as a promising and environmental friendly method for wastewater treatment and bio-production. The output power of a single cell is inadequate to drive loads directly. MFCs stacked in serials will promote bio-production or bioremediation and the voltage of the MFCs can be scaled up by connecting the cells in serials, whereas voltage reversal may emerge in this case. The causes for reversing polarity of MFCs have received great attention in recent years. This paper studies the mechanisms of voltage reversal and the approaches to solve the problem.