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    Hydrogen Generation in Microbial Reverse-Electrodialysis Electrolysis Cells Using a Heat-Regenerated Salt Solution

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    Type
    Article
    Authors
    Nam, Joo-Youn
    Cusick, Roland D.
    Kim, Younggy
    Logan, Bruce E.
    KAUST Grant Number
    KUS-11-003-13
    Date
    2012-04-09
    Online Publication Date
    2012-04-09
    Print Publication Date
    2012-05
    Permanent link to this record
    http://hdl.handle.net/10754/598533
    
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    Abstract
    Hydrogen gas can be electrochemically produced in microbial reverse-electrodialysis electrolysis cells (MRECs) using current derived from organic matter and salinity-gradient energy such as river water and seawater solutions. Here, it is shown that ammonium bicarbonate salts, which can be regenerated using low-temperature waste heat, can also produce sufficient voltage for hydrogen gas generation in an MREC. The maximum hydrogen production rate was 1.6 m3 H2/m3·d, with a hydrogen yield of 3.4 mol H2/mol acetate at a salinity ratio of infinite. Energy recovery was 10% based on total energy applied with an energy efficiency of 22% based on the consumed energy in the reactor. The cathode overpotential was dependent on the catholyte (sodium bicarbonate) concentration, but not the salinity ratio, indicating high catholyte conductivity was essential for maximizing hydrogen production rates. The direction of the HC and LC flows (co- or counter-current) did not affect performance in terms of hydrogen gas volume, production rates, or stack voltages. These results show that the MREC can be successfully operated using ammonium bicarbonate salts that can be regenerated using conventional distillation technologies and waste heat making the MREC a useful method for hydrogen gas production from wastes. © 2012 American Chemical Society.
    Citation
    Nam J-Y, Cusick RD, Kim Y, Logan BE (2012) Hydrogen Generation in Microbial Reverse-Electrodialysis Electrolysis Cells Using a Heat-Regenerated Salt Solution. Environ Sci Technol 46: 5240–5246. Available: http://dx.doi.org/10.1021/es300228m.
    Sponsors
    This study was supported by the National Renewable Energy Laboratory (NREL) and the King Abdullah University of Science and Technology (KAUST) (Award KUS-11-003-13).
    Publisher
    American Chemical Society (ACS)
    Journal
    Environmental Science & Technology
    DOI
    10.1021/es300228m
    PubMed ID
    22463373
    ae974a485f413a2113503eed53cd6c53
    10.1021/es300228m
    Scopus Count
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