Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 2, Pages 183-186Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.11.017
Keywords
Hydrogen; Microbial electrolysis cell (MEC); Stainless steel; Phosphate
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Microbial electrolysis cells (MEC) must work around neutral pH because of microbial catalysis at the anode. To develop a hydrogen evolution cathode that can work at neutral pH remains a major challenge in MEC technology. Voltammetry performed at pH 8.0 on rotating disk electrodes showed that the presence of phosphate species straightforwardly multiplied the current density of hydrogen evolution, through the so-called cathodic deprotonation reaction. The mechanism was stable on stainless steel cathodes whereas it rapidly vanished on platinum. The phosphate/stainless steel system implemented in a 25 L MEC with a marine microbial anode led to hydrogen evolution rates of up to 4.9 L/h/m(2) under 0.8 V voltage, which were of the same order than the best performance values reported so far. (C) 2009 Elsevier B.V. All rights reserved.
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