writer：J. Zhu, Z. Xiong, J. Zheng, Z. Luo, G. Zhu, C.o Xiao, Z. Meng, Y. Li*, K. Luo*
keywords：Nitrogen doping, Hybrid, Fe/Fe3C, Carbon black, Oxygen reduction reaction
source：期刊
specific source：Journal of Materials Science & Technology, 2019, 35, 2543–2551.
Issue time：2019年

Non-noble metal (NNM) catalysts have recently attracted intensive interest for their high catalytic performance towards oxygen reduction reaction (ORR) at low cost. Herein, a novel NNM catalyst wassynthesized by the simple pyrolysis of carbon black, urea and a Fe-containing precursor, which exhibitsexcellent ORRcatalytic activity, superiordurability andmethanoltolerance versus the Pt/Ccatalystinbothalkaline and acidic solutions. Scanning electron microscopy (SEM), transmission electron microscopy(TEM) and X-ray diffraction (XRD) characterizations demonstrate that the product is a nitrogen-dopedhybrid of graphite encapsulated Fe/Fe3C nanoparticles and carbon black. X-ray photoelectron spectrum(XPS) and electrochemical analyses indicate that the catalytic performance and chemical stability correlate closely with a nitrogen-rich layer on the Fe/Fe3C nanoparticle after pyrolysis with presence of urea,leading to the same four-electron pathway towards ORR as the Pt/C catalyst. The hybrid is prospective tobe an effificient ORR electrocatalyst for direct methanol fuel cells with high catalytic performance at lowcost.

https://doi.org/10.1016/j.jmst.2019.07.008