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Issue 24, 2017
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Achieving excellent activity and stability for oxygen reduction electrocatalysis by hollow mesoporous iron–nitrogen-doped graphitic carbon spheres

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Abstract

The replacement of platinum (Pt) by nonprecious catalysts with superior activity and stability for the oxygen reduction reaction (ORR) remains challenging for fuel cell devices. Herein, we describe a controllable strategy to prepare hollow graphitic carbon spheres with Fe–N-doped mesoporous shells via in situ polymerization and functionalization. The optimized catalyst exhibits very superior ORR activity with a half-wave potential (E1/2) of 0.886 V in 0.1 M KOH, 15 mV more positive than that of commercial Pt/C catalysts. Even in acidic solution, it also shows a competitive 4e ORR activity compared to Pt/C. Most importantly, it demonstrates much better long-term stability and resistance to methanol crossover than Pt/C in both alkaline and acidic media. The outstanding activity is contributed by the synergy of chemical functions (Fe–Nx-coordinated moieties) and excellent structural properties (hollow large cores (∼91 nm), open mesopores (∼2.1 nm) throughout the shells, and highly graphitic microstructures), ensuring rapid mass-diffusion and electron-transfer kinetics and full accessibility of catalytic sites.

Graphical abstract: Achieving excellent activity and stability for oxygen reduction electrocatalysis by hollow mesoporous iron–nitrogen-doped graphitic carbon spheres

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Publication details

The article was received on 02 Mar 2017, accepted on 15 May 2017 and first published on 30 May 2017


Article type: Paper
DOI: 10.1039/C7TA01896G
Citation: J. Mater. Chem. A, 2017,5, 12243-12251
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    Achieving excellent activity and stability for oxygen reduction electrocatalysis by hollow mesoporous iron–nitrogen-doped graphitic carbon spheres

    T. Zhou, Y. Zhou, R. Ma, Q. Liu, Y. Zhu and J. Wang, J. Mater. Chem. A, 2017, 5, 12243
    DOI: 10.1039/C7TA01896G

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