Adaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells
KAUST DepartmentEnvironmental Science and Engineering Program
Office of the VP
Water Desalination and Reuse Research Center (WDRC)
KAUST Grant NumberKUS-I1-003-13
Permanent link to this recordhttp://hdl.handle.net/10754/561889
MetadataShow full item record
AbstractOne form of power overshoot commonly observed with mixed culture microbial fuel cells (MFCs) is doubling back of the power density curve at higher current densities, but the reasons for this type of overshoot have not been well explored. To investigate this, MFCs were acclimated to different external resistances, producing a range of anode potentials and current densities. Power overshoot was observed for reactors acclimated to higher (500 and 5000. Ω) but not lower (5 and 50. Ω) resistances. Acclimation of the high external resistance reactors for a few cycles to low external resistance (5. Ω), and therefore higher current densities, eliminated power overshoot. MFCs initially acclimated to low external resistances exhibited both higher current in cyclic voltammograms (CVs) and higher levels of redox activity over a broader range of anode potentials (-0.4 to 0. V; vs. a Ag/AgCl electrode) based on first derivative cyclic voltammetry (DCV) plots. Reactors acclimated to higher external resistances produced lower current in CVs, exhibited lower redox activity over a narrower anode potential range (-0.4 to -0.2. V vs. Ag/AgCl), and failed to produce higher currents above ∼-0.3. V (vs. Ag/AgCl). After the higher resistance reactors were acclimated to the lowest resistance they also exhibited similar CV and DCV profiles. Our findings show that to avoid overshoot, prior to the polarization and power density tests the anode biofilm must adapt to low external resistances to be capable of higher currents. © 2011 Elsevier B.V.
SponsorsThis research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST) and a National Science Foundation Graduate Research Fellowship (D.F.C.).
JournalBiosensors and Bioelectronics
- Controlling the occurrence of power overshoot by adapting microbial fuel cells to high anode potentials.
- Authors: Zhu X, Tokash JC, Hong Y, Logan BE
- Issue date: 2013 Apr
- The overshoot phenomenon as a function of internal resistance in microbial fuel cells.
- Authors: Winfield J, Ieropoulos I, Greenman J, Dennis J
- Issue date: 2011 Apr
- Characterization of microbial fuel cells at microbially and electrochemically meaningful time scales.
- Authors: Ren Z, Yan H, Wang W, Mench MM, Regan JM
- Issue date: 2011 Mar 15
- Proton transport inside the biofilm limits electrical current generation by anode-respiring bacteria.
- Authors: Torres CI, Kato Marcus A, Rittmann BE
- Issue date: 2008 Aug 1
- Effect of external resistance on bacterial diversity and metabolism in cellulose-fed microbial fuel cells.
- Authors: Rismani-Yazdi H, Christy AD, Carver SM, Yu Z, Dehority BA, Tuovinen OH
- Issue date: 2011 Jan