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    Comparison of Nonprecious Metal Cathode Materials for Methane Production by Electromethanogenesis.

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    Type
    Article
    Authors
    Siegert, Michael
    Yates, Matthew D
    Call, Douglas F
    Zhu, Xiuping
    Spormann, Alfred
    Logan, Bruce E
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2014-02-26
    Online Publication Date
    2014-02-26
    Print Publication Date
    2014-04-07
    Permanent link to this record
    http://hdl.handle.net/10754/596838
    
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    Abstract
    In methanogenic microbial electrolysis cells (MMCs), CO2 is reduced to methane using a methanogenic biofilm on the cathode by either direct electron transfer or evolved hydrogen. To optimize methane generation, we examined several cathode materials: plain graphite blocks, graphite blocks coated with carbon black or carbon black containing metals (platinum, stainless steel or nickel) or insoluble minerals (ferrihydrite, magnetite, iron sulfide, or molybdenum disulfide), and carbon fiber brushes. Assuming a stoichiometric ratio of hydrogen (abiotic):methane (biotic) of 4:1, methane production with platinum could be explained solely by hydrogen production. For most other materials, however, abiotic hydrogen production rates were insufficient to explain methane production. At -600 mV, platinum on carbon black had the highest abiotic hydrogen gas formation rate (1600 ± 200 nmol cm(-3) d(-1)) and the highest biotic methane production rate (250 ± 90 nmol cm(-3) d(-1)). At -550 mV, plain graphite (76 nmol cm(-3) d(-1)) performed similarly to platinum (73 nmol cm(-3) d(-1)). Coulombic recoveries, based on the measured current and evolved gas, were initially greater than 100% for all materials except platinum, suggesting that cathodic corrosion also contributed to electromethanogenic gas production.
    Citation
    Siegert M, Yates MD, Call DF, Zhu X, Spormann A, et al. (2014) Comparison of Nonprecious Metal Cathode Materials for Methane Production by Electromethanogenesis. ACS Sustainable Chem Eng 2: 910–917. Available: http://dx.doi.org/10.1021/sc400520x.
    Sponsors
    We are indebted to John Cantolina of the Materials Science Center at Penn State University for help with ESEM and Hiroyuki Kashima and Yongtae Alm for technical assistance. This research was supported by the Global Climate and Energy Program (GCEP) and by the King Abdullah University of Science and Technology (KAUST, award KUS-I1-003-13).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Sustainable Chemistry & Engineering
    DOI
    10.1021/sc400520x
    PubMed ID
    24741468
    PubMed Central ID
    PMC3982937
    ae974a485f413a2113503eed53cd6c53
    10.1021/sc400520x
    Scopus Count
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