Impact of transition metal on nitrogen retention and activity of iron-nitrogen-carbon oxygen reduction catalysts

Selvarani Ganesan, Nathaniel Leonard, Scott Calabrese Barton

    Research output: Contribution to journalArticle

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    Abstract

    Iron based nitrogen doped carbon (FeNC) catalysts are synthesized by high-pressure pyrolysis of carbon and melamine with varying amounts of iron acetate in a closed, constant-volume reactor. The optimum nominal amount of Fe (1.2 wt%) in FeNC catalysts is established through oxygen reduction reaction (ORR) polarization. Since the quantity of iron used in FeNCs is very small, the amount of Fe retained in FeNC catalysts after leaching is determined by UV-VIS spectroscopy. As nitrogen is considered to be a component of active sites, the amount of bulk and surface nitrogen retention in FeNC catalysts are measured using elemental analysis and X-ray photoelectron spectroscopy, respectively. It is found that increasing nominal Fe content in FeNC catalysts leads to a decreased level of nitrogen retention. Thermogravimetric analysis demonstrates that increasing nominal Fe content leads to increased weight loss during pyrolysis, particularly at high temperatures. Catalysts are also prepared in the absence of iron source, and with iron removed by washing with hot aqua regia post-pyrolysis. FeNC catalysts prepared with no Fe show high retained nitrogen content but poor ORR activity, and aqua regia washed catalysts demonstrate similar activity to Fe-free catalysts, indicating that Fe is an active site component.

    Original languageEnglish (US)
    Pages (from-to)4576-4585
    Number of pages10
    JournalPhysical Chemistry Chemical Physics
    Volume16
    Issue number10
    DOIs
    StatePublished - Mar 14 2014

    Profile

    catalysts
    Afferent Loop Syndrome
    nitrogen
    iron
    pyrolysis
    carbon
    oxygen
    Pyrolysis
    melamine
    washing
    leaching
    acetates
    transition metals
    reactors
    photoelectron spectroscopy
    polarization
    spectroscopy
    Methacholine Compounds
    Edema Disease of Swine
    Acetanilides

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Physics and Astronomy(all)

    Cite this

    Impact of transition metal on nitrogen retention and activity of iron-nitrogen-carbon oxygen reduction catalysts. / Ganesan, Selvarani; Leonard, Nathaniel; Barton, Scott Calabrese.

    In: Physical Chemistry Chemical Physics, Vol. 16, No. 10, 14.03.2014, p. 4576-4585.

    Research output: Contribution to journalArticle

    Ganesan, Selvarani; Leonard, Nathaniel; Barton, Scott Calabrese / Impact of transition metal on nitrogen retention and activity of iron-nitrogen-carbon oxygen reduction catalysts.

    In: Physical Chemistry Chemical Physics, Vol. 16, No. 10, 14.03.2014, p. 4576-4585.

    Research output: Contribution to journalArticle

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