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• W2806099196 abstract "Iron-nitrogen-carbon materials (Fe-N-C) are considered as one of the most promising none precious candidates for oxygen reduction reaction. However, the role of iron carbides, one of the important accompanied species in Fe-N-C catalyst for oxygen reduction reaction, remains controversial. Herein, two different types of 3D graphene-based Fe-N-C catalysts with exposed and encapsulated Fe carbides were synthesized via pyrolysis of self-polymerization compounds of 2,6-Diaminopyridine using Fe(OH)3 and FeCl3 as both initiators and Fe sources, respectively. Interestingly, Mössbauer spectroscopy and X-ray photoelectron spectroscopy measurements show that both catalysts are composed of same Fe species with FeIIN4/C, iron carbide, iron nitride, metallic iron where the proportion of each corresponding component is similar. However, there is a big gap between the two catalysts in catalytic performance for oxygen reduction reaction. The kinetic current densities of the former catalyst (3.565 mA cm−2) at 0.9 V vs.RHE is 4.68 times and 1.50 times higher than that of the latter (0.7617 mA cm−2) and Pt/C catalyst (2.376 mA cm−2), respectively. This sharp contrast directly identifies the critical role of exposed Fe carbides nanodots on Fe-N-C in promoting Fe-N-C activity for oxygen reduction reaction. The new discovery brings a new insight into developing advanced none precious metal catalysts." @default.
• W2806099196 created "2018-06-13" @default.
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• W2806099196 date "2018-08-01" @default.
• W2806099196 modified "2023-09-27" @default.
• W2806099196 title "Critical role of iron carbide nanodots on 3D graphene based nonprecious metal catalysts for enhancing oxygen reduction reaction" @default.
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• W2806099196 doi "https://doi.org/10.1016/j.electacta.2018.05.206" @default.
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