• Login
    View Item 
    •   DSpace@RPI Home
    • Rensselaer Libraries
    • z_Technical Services
    • View Item
    •   DSpace@RPI Home
    • Rensselaer Libraries
    • z_Technical Services
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Role of mn2+ in the oxygen evolution reaction and the oxygen reduction reaction on birnessite

    Author
    Elrefaie, Ahmad
    View/Open
    Elrefaie_rpi_0185N_11807.pdf (1.662Mb)
    Other Contributors
    Chakrapani, Vidhya; Shi, Sufei; Hedden, Ronald;
    Date Issued
    2020-12
    Subject
    Chemical engineering
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute (RPI), Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/6299
    Abstract
    An emphasis on the search for alternatives to fossil fuels which maintain energy storage capacities in performance similar to fossil fuels has driven research attempts at the development of batteries such as metal-air batteries, which require the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) to function. The focus of the thesis work was to determine if Mn2+ dissolution and redeposition during electrochemical polarization played an important role in catalytic OER and ORR processes on birnessite (δ-MnO2). It was our hypothesis that formation of Mn2+ occurred during negative (ORR) polarization. Given the high solubility and mobility of Mn2+, the as-formed Mn2+ will likely dissolve from δ-MnO2 electrode into the electrolyte. In contrast, positive polarization should result in the redeposition of dissolved Mn2+ back on the electrode surface, where the ions likely undergo oxidation to Mn3+. Therefore, we expected to see the concentration of Mn2+ in the electrolyte to show a potential-dependent trend. The results of our experiments agreed with the proposed hypothesis and showed an increase in the concentration of Mn2+ after the electrochemical charging of δ-MnO2 in 1 M KOH electrolyte at ORR potentials. This conclusion therefore provides insight and support to the possibility that Mn2+ acts as an active site during the catalysis of ORR on birnessite.;
    Description
    December 2020; School of Engineering
    Department
    Dept. of Chemical and Biological Engineering;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students in accordance with the Rensselaer Standard license. Access inquiries may be directed to the Rensselaer Libraries.;
    Collections
    • z_Technical Services

    Browse

    All of DSpace@RPICommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    Login

    DSpace software copyright © 2002-2023  DuraSpace
    Contact Us | Send Feedback
    DSpace Express is a service operated by 
    Atmire NV