Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.262
Publication date: 18th July 2023
The concentration of free charge carriers in electro-active biofilms (EABfs) is linked to current densities that can be achieved in microbial fuel cells (MFC). Quantification of these carrires is generaly quantified at the end of experiments by means of destructive methods. Knowing how acetate used to feed the biofilm diffuses into it is another aspect of relevance for the understanding and optimization of the EABFs.
Here, for the first time, we use Impedance Spectroscopy (IS), polarization transients and Optical Coherence Tomography (OCT) to estimate charge carrier concentration and mass transfer limitations of EABfs in-operando conditions. Intermittent potential steps of 20, 60 and 300 seconds (duty cycle of 0.5) were applied to the EABfs after open circuit periods and their equilibration times were measured to be in the order of 10s. IS analysis of the EBFs, [1] showed that this discharging time corrresponded to a diffusion limited process. At the same time, acetate comsumption in the biofilm was found to be 100 times faster than the diffusion, what constrained the penetration of the acetate to the 2-3 first layers of microbia in the biofilm, Consecuently, most of the thickness of the bifilm, measured by OCT,[2] was not feeded and could not contribute to increase current density. Finnally, trough the analysis of capacitance obtained by IS, it was estimated a carrier concentration of 0.05mol/m3EABf at current densities of 1 A/m2 that raised up to 0.2 mol/m3EABf at current densities higher than 2 A/m2.
Dutch Ministry of Economic Affairs and Ministry of Infrastructure and Environment, the European Union Regional Development Fund, the Province of Fryslân, and the Northern Netherlands Provinces.
Project number 17516 of the research program Vidi which is (partly) financed by the Dutch Research Council (NWO)
Ministerio de Economía y Competitividad (MINECO) from Spain under ECOCAT project PID2020-116093RB-C41
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