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DOI	10.1039/c8ee00539g
	Epitaxial and atomically thin graphene-metal hybrid catalyst films: The dual role of graphene as the support and the chemically-transparent protective cap
	Abdelhafiz A.; Vitale A.; Buntin P.; Deglee B.; Joiner C.; Robertson A.; Vogel E.M.; Warner J.; Alamgir F.M.
发表日期	2018
ISSN	17545692
起始页码	1610
结束页码	1616
卷号	11 期号:6
英文摘要	In this study, we demonstrate dual roles for graphene, as both a platform for large-area, fully-wetted growth of two-dimensional Pt films that are one monolayer to several multilayers thick, while also serving as a 'chemically transparent' barrier to catalytic deactivation wherein graphene does not restrict the access of the reactants but does block Pt from dissolution or agglomeration. Using these architectures, we show that it is possible to simultaneously achieve enhanced catalytic activity and unprecedented stability, retaining full activity beyond 1000 cycles, for the canonical oxygen reduction reaction (ORR). Using high resolution TEM, AFM, X-ray photoemission/absorption spectroscopy (XPS/XAS), Raman, and electrochemical methods, we show that, due to intimate graphene-Pt epitaxial contact, Pt-ML/GR hybrid architectures are able to induce a compressive strain on the supported Pt adlayer and increase catalytic activity for ORR. With no appreciable Pt loss or agglomeration observed with the GR/Pt-ML catalysts after 1000 ORR cycles, our results open the door to using similar graphene-templated/graphene-capped hybrid catalysts as means to improve catalyst lifetime without a necessary compromise to their activity. More broadly, the epitaxial growth made possible by the room-temperature, wetted synthesis approach, should allow for efficient transfer of charge, strain, phonons and photons, impacting not just catalysis, but also electronic, thermoelectric and optical materials. © 2018 The Royal Society of Chemistry.
英文关键词	Agglomeration; Electrolytic reduction; Graphene; Wetting; Catalytic deactivation; ELectrochemical methods; Enhanced catalytic activity; High-resolution TEM; Hybrid architectures; Oxygen reduction reaction; Transfer of charges; X-ray photoemissions; Catalyst activity; carbon; catalysis; catalyst; dissolution; film; metal; 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/190217
作者单位	School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States; Department of Materials, University of Oxford, Oxford, OX1 3PH, United Kingdom
推荐引用方式 GB/T 7714	Abdelhafiz A.,Vitale A.,Buntin P.,et al. Epitaxial and atomically thin graphene-metal hybrid catalyst films: The dual role of graphene as the support and the chemically-transparent protective cap[J],2018,11(6).
APA	Abdelhafiz A..,Vitale A..,Buntin P..,Deglee B..,Joiner C..,...&Alamgir F.M..(2018).Epitaxial and atomically thin graphene-metal hybrid catalyst films: The dual role of graphene as the support and the chemically-transparent protective cap.Energy & Environmental Science,11(6).
MLA	Abdelhafiz A.,et al."Epitaxial and atomically thin graphene-metal hybrid catalyst films: The dual role of graphene as the support and the chemically-transparent protective cap".Energy & Environmental Science 11.6(2018).