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Atomically Dispersed Fe-Nx Active Sites within Hierarchical Mesoporous Carbon as Efficient Electrocatalysts for Oxygen Reduction Reaction

Abstract

It remains a great challenge to develop highly efficient catalysts with earth abundant materials to replace the precious platinum group metal (PGM) catalysts for oxygen reduction reaction (ORR). Here, we report a self-sacrificing template strategy to synthesize hierarchical mesoporous carbon materials with atomically dispersed Fe-Nx active sites. Derived from the Fe-polydopamine precursor obtained via in-situ polymerization of dopamine and etching of cobalt-template using a FeCl3 solution, the resultant catalyst shows a high specific surface area (1229.3 m2 g-1), a hierarchical mesoporous structure, an improved hydrophilicity, and abundant atomically dispersed Fe-Nx active sites. As a result, the single atom catalyst exhibits a remarkable activity and durability in 0.1 M KOH with an onset and half-wave potential of 1.03 and 0.88 V, respectively, which outperforms its commercial Pt/C counterpart. In acid and neutral media, the catalyst also demonstrates a comparable electrocatalytic activity yet much greater durability than that of the commercial Pt/C. This work opens a new avenue for synthesis of cost-effective catalysts at atomic scale for efficient energy conversion.

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Publication details

The article was received on 08 Jun 2019, accepted on 12 Aug 2019 and first published on 13 Aug 2019


Article type: Communication
DOI: 10.1039/C9TA06128B
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Atomically Dispersed Fe-Nx Active Sites within Hierarchical Mesoporous Carbon as Efficient Electrocatalysts for Oxygen Reduction Reaction

    W. Gu, M. Wu, J. Sun, J. Xu and T. S. Zhao, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA06128B

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