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Polarisation curves of the cathodes in phosphate buffer (pH = 7.06; EC = 14.86 mS·cm−1) prior to inoculation. Lines represent duplicate of independent reactors. Green, red and blue curves stand for the 1 cm, 2 cm and 3 cm conditions, respectively conditions A, B and C. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
