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    Noble-Metal-Free Iron Nitride/Nitrogen-Doped Graphene Composite for the Oxygen Reduction Reaction

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    Type
    Article
    Authors
    Varga, Tamás
    Vásárhelyi, Lívia
    Ballai, Gergő
    Haspel, Henrik
    Oszkó, Albert
    Kukovecz, Ákos
    Kónya, Zoltán
    KAUST Department
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2019-01-03
    Online Publication Date
    2019-01-03
    Print Publication Date
    2019-01-31
    Permanent link to this record
    http://hdl.handle.net/10754/631143
    
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    Abstract
    Considerable effort has been devoted recently to replace platinum-based catalysts with their non-noble-metal counterparts in the oxygen reduction reaction (ORR) in fuel cells. Nitrogen-doped carbon structures emerged as possible candidates for this role, and their earth-abundant metal-decorated composites showed great promise. Here, we report on the simultaneous formation of nitrogen-doped graphene and iron nitride from the lyophilized mixture of graphene oxide and iron salt by high-temperature annealing in ammonia atmosphere. A mixture of FeN and FeN particles was formed with average particle size increasing from 23.4 to 127.0 nm and iron content ranging from 5 to 50 wt %. The electrocatalytic oxygen reduction activity was investigated via the rotating disk electrode method in alkaline media. The highest current density of 3.65 mA cm at 1500 rpm rotation rate was achieved in the 20 wt % catalyst via the four-electrode reduction pathway, exceeding the activity of both the pristine iron nitride and the undecorated nitrogen-doped graphene. Since our catalysts showed improved methanol tolerance compared to the platinum-based ones, the formed non-noble-metal system offers a viable alternative to the platinum-decorated carbon black (Pt/CB) ORR catalysts in direct methanol fuel cells.
    Citation
    Varga T, Vásárhelyi L, Ballai G, Haspel H, Oszkó A, et al. (2019) Noble-Metal-Free Iron Nitride/Nitrogen-Doped Graphene Composite for the Oxygen Reduction Reaction. ACS Omega 4: 130–139. Available: http://dx.doi.org/10.1021/acsomega.8b02646.
    Sponsors
    Financial support from the Hungarian National Research Development and Innovation Office through grants GINOP- 2.3.2-15-2016-00013, NKFIH OTKA K120115 (Z.K.), and K126065 (A.K.) is gratefully acknowledged.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Omega
    DOI
    10.1021/acsomega.8b02646
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsomega.8b02646
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsomega.8b02646
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

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