Dynamic polarisation reveals differential steady-state stabilisation and capacitive-like behaviour in microbial fuel cells

Ledezma, P., Degrenne, N., Bevilacqua, P., Buret, François, Allard, B., Greenman, J. and Ieropoulos, I. (2014) Dynamic polarisation reveals differential steady-state stabilisation and capacitive-like behaviour in microbial fuel cells. Sustainable Energy Technologies and Assessments, 5. pp. 1-6. ISSN 2213-1388 Available from: http://eprints.uwe.ac.uk/28908

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Publisher's URL: http://dx.doi.org/10.1016/j.seta.2013.10.008

Abstract/Description

In this paper we present several preliminary results produced with a purposely-designed external-resistor (Rext) sweeping tool for microbial fuel cells (MFCs). Fast sampling rates show that MFCs exhibit differential steady-state stabilisation behaviours depending on Rext, with consequences for time constant (tc) selection. At high Rext (35 kΩ), it is demonstrated that a tc ⩾ 10 min avoids underestimation not overestimation, whilst at low Rext (100 Ω) 5 min are sufficient, suggesting that sweeps with variable tc are possible. However, within the maximum power transfer range (2.5 kΩ), steady-states are only observed at 20 min tc but with a smaller confidence interval, questioning whether the polarisation technique is suitable to estimate maximum power transfer. Finally, a strategy towards the exploitation of a capacitive-like behaviour in MFCs is proposed, tapping into ⩾10 min periods with up to 50% higher current and energy transfer that could prove important for MFC-powered applications.

Item Type:Article
Uncontrolled Keywords:microbial fuel cells, external resistors, polarisation curve, time constant, steady-states
Faculty/Department:Faculty of Environment and Technology > Department of Engineering Design and Mathematics
ID Code:28908
Deposited By: B. Jones
Deposited On:23 May 2016 11:03
Last Modified:23 May 2016 11:03

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