Co-electrolysis of Biohythane using Solid Oxide Fuel Cell Technology

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    Abstract

    Two-stage anaerobic digestion enables the production of biohythane, which is composed of 60/30/10 vol% CH4/CO2/H2 and is easier and more beneficial to utilize than conventional biogas (60/40 vol% CH4/CO2). This study has investigated co-electrolysis of biohythane with H2O and CO2 using an anode-supported solid oxide fuel cell. The kinetic performance of the cell was characterized using I-V curves and electrochemical impedance spectroscopy. The output gases from the anode were characterized using quadrupole mass spectrometry. The work has shown that addition of 10 vol% H2 to CH4/CO2 feedstocks markedly improves the overall performance of the cell in electrolysis mode. Co-electrolyzing with H2O gave the highest performance, highest syngas (H2 + CO) yield (87%) and highest H2/CO ratio (2.69). Co-electrolyzing with CO2 decreased the catalytic and electrochemical conversion of reactants, giving lower performance, lower syngas yields (79%) and lower H2/CO ratios (0.87). Enhanced performance with H2O was due to a mixture of increased catalytic and electrochemical conversion of reactants.
    Original languageEnglish
    Title of host publicationECS Transactions
    Subtitle of host publicationSolid Oxide Fuel Cells 16 (SOFC-XVI)
    Place of PublicationPennington, NJ, USA
    PublisherElectrochemical Society
    Chapter1
    Pages2333-2342
    Number of pages10
    Volume91
    Edition1
    ISBN (Electronic)978-1-60768-874-7
    ISBN (Print)1938-6737
    DOIs
    Publication statusPublished - 8 Sep 2019
    Event16th International Symposium on Solid Oxide Fuel Cells 2019 - Kyoto Terrsa , Kyoto, Japan
    Duration: 8 Sep 201913 Sep 2019
    Conference number: 16th

    Conference

    Conference16th International Symposium on Solid Oxide Fuel Cells 2019
    Abbreviated titleSOFC-XVI
    Country/TerritoryJapan
    CityKyoto
    Period8/09/1913/09/19

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