Journal
CATALYSIS LETTERS
Volume 147, Issue 11, Pages 2745-2754Publisher
SPRINGER
DOI: 10.1007/s10562-017-2186-2
Keywords
Metal-nitrogen-doped carbon; Silver nanopartical; Oxygen reduction reaction; Cocatalyst
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Funding
- China National Natural Science Foundation [21303058]
- Shanghai Municipal Natural Science Foundation [13ZR1412400]
- Key Project of Shanghai Science and Technology Committee [11JC1403400, 14231200300]
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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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