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Polyacrylamide Microspheres-Derived Fe3C@N-doped Carbon Nanospheres as Efficient Catalyst for Oxygen Reduction Reaction

1
College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, Hubei, China
2
Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China
3
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(5), 767; https://doi.org/10.3390/polym11050767
Received: 7 March 2019 / Revised: 16 April 2019 / Accepted: 19 April 2019 / Published: 1 May 2019
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Abstract

High-performance non-precious metal catalysts exhibit high electrocatalytic activity for the oxygen-reduction reaction (ORR), which is indispensable for facilitating the development of multifarious renewable energy systems. In this work; N-doped carbon-encapsulated Fe3C nanosphere ORR catalysts were prepared through simple carbonization of iron precursors loaded with polyacrylamide microspheres. The effect of iron precursors loading on the electrocatalytic activity for ORR was investigated in detail. The electrochemical measurements revealed that the N-doped carbon-encapsulated Fe3C nanospheres exhibited outstanding electrocatalytic activity for ORR in alkaline solutions. The optimized catalyst possessed more positive onset potential (0.94 V vs. reversible hydrogen electrode (RHE)), higher diffusion limiting current (5.78 mA cm−2), better selectivity (the transferred electron number n > 3.98 at 0.19 V vs. RHE) and higher durability towards ORR than a commercial Pt/C catalyst. The efficient electrocatalytic performance towards ORR can be attributed to the synergistic effect between N-doped carbon and Fe3C as catalytic active sites; and the excellent stability results from the core-shell structure of the catalysts. View Full-Text
Keywords: polyacrylamide microspheres; N-doped carbon; Fe3C; core-shell structure; oxygen reduction reaction polyacrylamide microspheres; N-doped carbon; Fe3C; core-shell structure; oxygen reduction reaction
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Chen, M.; Jiang, Y.; Mei, P.; Zhang, Y.; Zheng, X.; Xiao, W.; You, Q.; Yan, X.; Tang, H. Polyacrylamide Microspheres-Derived Fe3C@N-doped Carbon Nanospheres as Efficient Catalyst for Oxygen Reduction Reaction. Polymers 2019, 11, 767.

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