NDLI: FeN stabilized FeN@Pt core–shell nanostructures for oxygen reduction reaction

Content Provider	Royal Society of Chemistry (RSC)
Author	Pollet, Bruno G. Yin, Shibin An, Kang Ding, Xiao Shi, Nai Qiang, Yinghuai Pasupathi, Sivakumar Luo, Lin Shen, Pei Kang
Copyright Year	2015
Abstract	The high cost and poor stability of catalysts are the main obstacles for the commercialization of proton exchange membrane (PEM) fuel cells, particularly, the catalysts for the oxygen reduction reaction (ORR). Here, PtFe nanocatalysts with different Pt to Fe atomic ratios are prepared by the impregnation-reduction method and subsequently thermal annealing in NH3 at ambient pressure. XRD, STEM, XPS and ICP are employed to investigate the corresponding physico-chemical properties of the as-prepared catalysts, which demonstrate that the samples are Pt-rich core–shell nanostructures. The cyclic voltammetry method is used to investigate their electrochemical performance, and the results show that these catalysts display high ORR activity in O2-saturated 0.1 mol L−1 HClO4 aqueous solutions, with PtFe3N/C displaying the highest mass activity of 369.32 mA mg−1 Pt in 0.90 V vs. RHE, which is about 3 times higher than that of a commercial Pt/C catalyst (129.15 mA mg−1 Pt) at the same potential. Moreover, it is also found that the as-prepared catalysts are almost 2 times more stable than the commercial Pt/C. The ORR activity is slightly affected after 30k cycles in O2-saturated HClO4 aqueous solutions. This low cost ORR catalyst, which exhibits a high performance, opens up possibilities for designing core–shell nanostructures for energy conversion.
Starting Page	4462
Ending Page	4469
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	8
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta06499b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	ICP RHE Proton-exchange membrane Redox Nucleic acid thermodynamics Ammonia X-ray crystallography Scanning transmission electron microscopy Cyclic voltammetry Electrochemistry Oxygen List of WWE United States Champions
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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