New architecture for modulization of membraneless and single-chambered microbial fuel cell using a bipolar plate-electrode assembly (BEA)

A 90-liter stackable baffled microbial fuel cell for brewery wastewater treatment based on energy self-sufficient mode

“…When a capacitor was charged from a discharging potential ( d V ) to a charging potential ( c V ), the quality of charge ( Q ) stored in the capacitor was calculated using formula (1).…”

Concurrent Control of Power Overshoot and Voltage Reversal with Series Connection of Parallel‐Connected Microbial Fuel Cells

“…[7,13,14,17] Although the voltage reversale ven occurred in unit 3o fM FC 3-4, it was responsible for both the anode and the cathode overpotential of unit 3, and its anode potential at the maximumc urrento f1 .18 mA was kept low at À0.11 Va tw hich EAB activity is stable (Figure 2c). [8,12] These results clearly indicate that if ap ower overshoot-effected unit is electrically connected in series with the other units that produce higher current,t he power overshoot-effected unit could deteriorate the performance of the serially connected MFC system in terms of available current and EAB stability. Much more importantly, no power overshoot or voltage reversalw as observed in MFC 1//2.…”

“…[7,8] Voltage reversal is ap henomenonb yw hich the voltage of au nit in stacked MFC drops below zero volts under shortcircuit conditions (externalr esistor = 0), and the other units in the stacked MFC maintain positive voltages. [1,[7][8][9][10][11][12][13][14][15][16] Studies in the literature have reported that that the microbial community,f uel starvation,o rs ubstrate loadingr ate can cause relatively sluggish kinetics on the anode and lead al arge anode overpotential compared to the cathode, [1,[7][8][9][10][11][12][13][14][15][16] whichr esults in voltage reversal of the stacked MFC.T he literature also discussed that the reversed voltage could adversely affect the electro-active anodeb iofilm after long-term operation or changes to the microbial community in the stacked MFC,w hich might deteriorate MFC systems. [7][8][9][10][11][12][13][14][15][16] Fort his One in four microbial fuel cell (MFC) units suffers from power overshoot.…”

“…However, though these methods can efficiently control the voltage reversal, they are not effective in preventing power overshoot. Unfortunately,f ew studies,i fa ny,h ave comprehensively investigated the simultaneous control of powero vershoota nd voltage reversal that occur in MFC systems.A gain, note that the power overshoot resultsi ns luggish anode kinetics, [2][3][4][5][6] and that voltage reversal results from sluggish anode kinetics; [7][8][9][10][11] as ar esult, power overshoot leads to as udden drop in the current, which could result in an overall delay of the current in the circuit and thereby cause av oltage reversal. Hence, if there is aw ay to improve the anode kinetic activity (i.e., anodic current)i na ni nferior (or poor) MFC unit, it may be possible to concurrently control both the power overshoot and voltage reversal.…”

Bioelectrochemical synthesis of caproate through chain elongation as a complementary technology to anaerobic digestion

“…The membrane is considered to be the most expensive element in the BES reactor, where the cost of a Nafion 117, a usual proton exchange membrane, is approximately $1100 m −2 . Consequently, several studies tried to avoid using membrane by constructing membraneless setups to decrease the capital costs and alleviate pH gradients between anode and cathode . Electricity is also one of the main cost elements for the operation of MES, which accounts for more than half of the total operating and maintaining (O&M) costs.…”