Journal
BIOELECTROCHEMISTRY
Volume 74, Issue 1, Pages 78-82Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2008.07.007
Keywords
Microbial fuel cell; Air cathode; pH; Electrochemical impedance spectroscopy
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The measurement of electricity generation from an air-cathode microbial fuel cell (MFC) with a mixed bacteria culture at different pH showed that this MFC could tolerate an initial (feed solution) pH as high as 10. The optimal initial pH was between 8 and 10 with higher current generation compared to lower or higher pH. The bacterial metabolism exhibited a buffer effect and changed the electrolyte pH. The impedance spectra of the anode and cathode of the MFC at the open-circuit potential (OCP) revealed that the anodic microbial process preferred a neutral pH and microbial activities decreased at higher or lower pH: while the cathodic reaction was improved with increasing pH. (C) 2008 Elsevier B.V. All rights reserved.
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