气候变化领域集成服务门户(CCPortal): Highly active atomically dispersed CoN 4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: Carbon-shell confinement strategy

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DOI	10.1039/c8ee02694g
	Highly active atomically dispersed CoN 4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: Carbon-shell confinement strategy
	Wang G.; He Y.; Hwang S.; Cullen D.A.; Uddin M.A.; Langhorst L.; Li B.; Karakalos S.; Kropf A.J.; Wegener E.C.; Sokolowski J.; Chen M.; Myers D.; Su D.; More K.L.; Litster S.; Wu G.
发表日期	2019
ISSN	17545692
起始页码	250
结束页码	260
卷号	12 期号:1
英文摘要	Development of platinum group metal (PGM)-free catalysts for oxygen reduction reaction (ORR) is essential for affordable proton exchange membrane fuel cells. Herein, a new type of atomically dispersed Co doped carbon catalyst with a core-shell structure has been developed via a surfactant-assisted metal-organic framework approach. The cohesive interactions between the selected surfactant and the Co-doped zeolitic imidazolate framework (ZIF-8) nanocrystals lead to a unique confinement effect. During the thermal activation, this confinement effect suppressed the agglomeration of Co atomic sites and mitigated the collapse of internal microporous structures of ZIF-8. Among the studied surfactants, Pluronic F127 block copolymer led to the greatest performance gains with a doubling of the active site density relative to that of the surfactant-free catalyst. According to density functional theory calculations, unlike other Co catalysts, this new atomically dispersed Co-N-C@F127 catalyst is believed to contain substantial CoN 2+2 sites, which are active and thermodynamically favorable for the four-electron ORR pathway. The Co-N-C@F127 catalyst exhibits an unprecedented ORR activity with a half-wave potential (E 1/2 ) of 0.84 V (vs. RHE) as well as enhanced stability in the corrosive acidic media. It also demonstrated high initial performance with a power density of 0.87 W cm -2 along with encouraging durability in H 2 -O 2 fuel cells. The atomically dispersed Co site catalyst approaches that of the Fe-N-C catalyst and represents the highest reported PGM-free and Fe-free catalyst performance. © 2019 The Royal Society of Chemistry.
英文关键词	Block copolymers; Carbon; Catalyst activity; Cobalt; Crystalline materials; Density functional theory; Electrolytic reduction; Iron compounds; Organometallics; Surface active agents; Catalyst performance; Cohesive interactions; Core shell structure; Metal organic framework; Micro-porous structure; Oxygen reduction reaction; Platinum group metals; Zeolitic imidazolate frameworks; Proton exchange membrane fuel cells (PEMFC); catalyst; durability; electrode; fuel cell; organometallic compound; performance assessment; reduction; shell; surfactant; thermodynamics
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/190011
作者单位	Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, United States; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, United States; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States; Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States; Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, United States; Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, United States; Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, United States; Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
推荐引用方式 GB/T 7714	Wang G.,He Y.,Hwang S.,et al. Highly active atomically dispersed CoN 4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: Carbon-shell confinement strategy[J],2019,12(1).
APA	Wang G..,He Y..,Hwang S..,Cullen D.A..,Uddin M.A..,...&Wu G..(2019).Highly active atomically dispersed CoN 4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: Carbon-shell confinement strategy.Energy & Environmental Science,12(1).
MLA	Wang G.,et al."Highly active atomically dispersed CoN 4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: Carbon-shell confinement strategy".Energy & Environmental Science 12.1(2019).