Abstract
Mesoporous Fe–N–C supported Ag nanoparticles (AgNPs) with different metal loadings (Fe–N–C/AgNPs-n, n = 1, 2, 3) were prepared by a facile method. The as-prepared Fe–N–C/AgNPs-n catalysts were demonstrated to be the excellent electrocatalysts for oxygen reduction reaction (ORR) in alkaline media. The Fe–N–C/AgNPs-2 exhibited the highest electrocatalytic activity with onset potential of 1.03 V and half-wave potential of 0.88 V for ORR, which were higher than commercial Pt/C (20 wt%) and Fe–N–C catalysts reported in the literature. Moreover, the prepared Fe–N–C/AgNPs-2 material possessed intrinsic long-time stability and the excellent methanol resistance toward the ORR in alkaline media. The Tafel slope and Tafel curve shape for ORR on Fe–N–C/AgNPs-n and Fe–N–C and the decrease of N’s binding energy in the Fe–N–C/AgNPs-n testify that the active sites for ORR in Fe–N–C/AgNPs-n are on Fe–N–C rather than on AgNPs. The AgNPs enhance the electrocatalytic activity of Fe–N–C for ORR as cocatalyst by inducing a more negative charge on the adjacent N to C, which may be the important reason for improving ORR performance of Fe–N–C.
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Acknowledgements
The authors are grateful to financial support from China National Natural Science Foundation (No. 21303058), Shanghai Municipal Natural Science Foundation (No. 13ZR1412400), and the Key Project of Shanghai Science and Technology Committee (Nos. 11JC1403400 and 14231200300).
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Chen, Z., Li, C., Ni, Y. et al. Ag-enhanced Catalytic Performance of Ordered Mesoporous Fe–N-Graphitic Carbons for Oxygen Electroreduction. Catal Lett 147, 2745–2754 (2017). https://doi.org/10.1007/s10562-017-2186-2
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DOI: https://doi.org/10.1007/s10562-017-2186-2