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    Repression of hydrogen uptake using conjugated oligoelectrolytes in microbial electrolysis cells

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    Type
    Article
    Authors
    Hou, Huijie
    Chen, Xiaofen
    Liu, Jia
    Zhu, Xiuping
    Bazan, Guillermo C. cc
    Logan, Bruce E.
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2014-11
    Permanent link to this record
    http://hdl.handle.net/10754/599499
    
    Metadata
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    Abstract
    Copyright © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. DSBN+, a conjugated oligoelectrolyte (COE), was added to microbial electrolysis cells (MECs) to improve hydrogen recovery. The volume of hydrogen gas recovered in a fedbatch cycle of mixed culture MECs increased by 126× compared to controls (no COE addition), mainly by preventing the loss of hydrogen to methane production. Performance in pure culture MECs fed with Geobacter sulfurreducens increased by factors of 10.5 in terms of energy yield, 2.1 in COD removal, and 11.8 in hydrogen yield. Hydrogen gas recycling was reduced, and the volume of hydrogen gas recovered increased by 6.5× compared to controls. Minimal methane production and a lack of hydrogen gas uptake by G. sulfurreducens suggested that the COEs increased hydrogen recoveries by interfering with hydrogen uptake by hydrogenotrophic methanogens but also by exoelectrogenic bacteria. COEs may therefore be useful for inhibiting the activities of certain hydrogenases, although the mechanism of inhibition needs further investigation.
    Citation
    Hou H, Chen X, Liu J, Zhu X, Bazan GC, et al. (2014) Repression of hydrogen uptake using conjugated oligoelectrolytes in microbial electrolysis cells. International Journal of Hydrogen Energy 39: 19407–19415. Available: http://dx.doi.org/10.1016/j.ijhydene.2014.09.101.
    Sponsors
    We thank Professor James G. Ferry at Penn State for providing cultures of M. acetiuorans and Dr. Michael Siegert for helping to culture M. acetiuorans. This work was funded by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST) and the Institute for Collaborative Biotechnologies (ICB) under grant W911F-09-D-0001 from the U.S. Army Research Office.
    Publisher
    Elsevier BV
    Journal
    International Journal of Hydrogen Energy
    DOI
    10.1016/j.ijhydene.2014.09.101
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijhydene.2014.09.101
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