气候变化领域集成服务门户(CCPortal): Atomically dispersed Fe-N-C decorated with Pt-alloy core-shell nanoparticles for improved activity and durability towards oxygen reduction

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DOI	10.1039/d0ee00832j
	Atomically dispersed Fe-N-C decorated with Pt-alloy core-shell nanoparticles for improved activity and durability towards oxygen reduction
	Ao X.; Zhang W.; Zhao B.; Ding Y.; Nam G.; Soule L.; Abdelhafiz A.; Wang C.; Liu M.
发表日期	2020
ISSN	17545692
起始页码	3032
结束页码	3040
卷号	13 期号:9
英文摘要	One of the key challenges that hinders broad commercialization of proton exchange membrane fuel cells is the high cost and inadequate performance of the catalysts for the oxygen reduction reaction (ORR). Here we report a composite ORR catalyst consisting of ordered intermetallic Pt-alloy nanoparticles attached to an N-doped carbon substrate with atomically dispersed Fe-N-C sites, demonstrating substantially enhanced catalytic activity and durability, achieving a half-wave potential of 0.923 V (vs. RHE) and negligible activity loss after 5000 cycles of an accelerated durability test. The composite catalyst is prepared by deposition of Pt nanoparticles on an N-doped carbon substrate with atomically dispersed Fe-N-C sites derived from a metal-organic framework and subsequent thermal treatment. The latter results in the formation of core-shell structured Pt-alloy nanoparticles with ordered intermetallic Pt3M (M = Fe and Zn) as the core and Pt atoms on the shell surface, which is beneficial to both the ORR activity and stability. The presence of Fe in the porous Fe-N-C substrate not only provides more active sites for the ORR but also effectively enhances the durability of the composite catalyst. The observed enhancement in performance is attributed mainly to the unique structure of the composite catalyst, as confirmed by experimental measurements and computational analyses. Furthermore, a fuel cell constructed using the as-developed ORR catalyst demonstrates a peak power density of 1.31 W cm-2. The strategy developed in this work is applicable to the development of composite catalysts for other electrocatalytic reactions. This journal is © The Royal Society of Chemistry.
英文关键词	Catalyst activity; Composite structures; Core shell nanoparticles; Doping (additives); Durability; Electrocatalysis; Electrolytic reduction; Intermetallics; Iron; Metal nanoparticles; Metal-Organic Frameworks; Organometallics; Oxygen; Oxygen reduction reaction; Platinum metals; Proton exchange membrane fuel cells (PEMFC); Shells (structures); Accelerated durability tests; Composite catalysts; Computational analysis; Electrocatalytic reactions; Enhanced catalytic activity; Half-wave potential; Improved activities; Peak power densities; Platinum alloys; alloy; carbon; iron ore; nanoparticle; nickel; oxygen; platinum; reduction
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189542
作者单位	School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States; Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China; Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
推荐引用方式 GB/T 7714	Ao X.,Zhang W.,Zhao B.,et al. Atomically dispersed Fe-N-C decorated with Pt-alloy core-shell nanoparticles for improved activity and durability towards oxygen reduction[J],2020,13(9).
APA	Ao X..,Zhang W..,Zhao B..,Ding Y..,Nam G..,...&Liu M..(2020).Atomically dispersed Fe-N-C decorated with Pt-alloy core-shell nanoparticles for improved activity and durability towards oxygen reduction.Energy & Environmental Science,13(9).
MLA	Ao X.,et al."Atomically dispersed Fe-N-C decorated with Pt-alloy core-shell nanoparticles for improved activity and durability towards oxygen reduction".Energy & Environmental Science 13.9(2020).