First air-tolerant effective stainless steel microbial anode obtained from a natural marine biofilm |
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Authors: | Benjamin Erable Alain Bergel |
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Affiliation: | Laboratoire de Génie Chimique, CNRS, Université de Toulouse, 5 rue Paulin Talabot, BP 1301, 31106 Toulouse, France |
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Abstract: | Microbial anodes were constructed with stainless steel electrodes under constant polarisation. The seawater medium was inoculated with a natural biofilm scraped from harbour equipment. This procedure led to efficient microbial anodes providing up to 4 A/m2 for 10 mM acetate oxidation at −0.1 V/SCE. The whole current was due to the presence of biofilm on the electrode surface, without any significant involvement of the abiotic oxidation of sulphide or soluble metabolites. Using a natural biofilm as inoculum ensured almost optimal performance of the biofilm anode as soon as it was set up; the procedure also proved able to form biofilms in fully aerated media, which provided up to 0.7 A/m2. The current density was finally raised to 8.2 A per square meter projected surface area using a stainless steel grid. The inoculating procedure used here combined with the control of the potential revealed, for the first time, stainless steel as a very competitive material for forming bioanodes with natural microbial consortia. |
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Keywords: | Electrochemically active biofilm Marine biofilm Stainless steel Microbial fuel cell Bioanode |
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