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

Tamás Varga, Lívia Vásárhelyi, Gergő Ballai, Henrik Haspel, Albert Oszkó, Ákos Kukovecz, Zoltán Kónya

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


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.
Original languageEnglish (US)
Pages (from-to)130-139
Number of pages10
JournalACS Omega
Issue number1
StatePublished - Jan 3 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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.


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