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DOI	10.1039/c9ee00381a
	Work function-tailored graphene via transition metal encapsulation as a highly active and durable catalyst for the oxygen reduction reaction
	Sharma M.; Jang J.-H.; Shin D.Y.; Kwon J.A.; Lim D.-H.; Choi D.; Sung H.; Jang J.; Lee S.-Y.; Lee K.Y.; Park H.-Y.; Jung N.; Yoo S.J.
发表日期	2019
ISSN	17545692
起始页码	2200
结束页码	2211
卷号	12 期号:7
英文摘要	To dramatically improve the performance of non-precious catalyst-based anion exchange membrane fuel cells (AEMFCs), a conceptual change in the structure of conventional electrocatalysts is needed. Here we report a novel work function tailoring of graphene via adopting a graphene shell-encapsulated Co nanoarchitecture to efficiently activate the graphitic carbon shell as an exclusive and main active site for the oxygen reduction reaction (ORR). Theoretical calculations and electrochemical analysis suggest that the charge transfer from core Co nanoparticles to the outer graphene shell results in a significant change in the electronic structure of the graphene shell and reduces its work function. The present catalyst shows high ORR catalytic activity but exceptionally enhanced durability compared to a Pt catalyst in alkaline media, which is attributed mainly to the reduced work function of the outer graphene shell and the 3D nanographene structure providing a large number of active carbon sites. The single cell using the graphene shell-encapsulated Co nanoparticles as a cathode catalyst produces a high maximum power density of 412 mW cm-2, making this among the best non-precious catalysts for the ORR reported so far. Therefore, our results demonstrate a promising strategy to rationally design inexpensive and durable oxygen reduction catalysts, and this hybrid concept will provide a new perspective for catalyst structures which can practically be used in AEMFCs. © The Royal Society of Chemistry 2019.
英文关键词	Alkaline fuel cells; Catalyst activity; Charge transfer; Electrocatalysts; Electrolytic reduction; Electronic structure; Ion exchange membranes; Nanocatalysts; Nanoparticles; Oxygen; Shells (structures); Transition metals; Work function; Anion-exchange membrane fuel cells; Electrochemical analysis; Maximum power density; Non-precious catalysts; Oxygen reduction catalysts; Oxygen reduction reaction; Theoretical calculations; Transition metal encapsulation; Graphene; catalysis; catalyst; chemical compound; encapsulation; ion exchange; membrane; nanoparticle; reduction; transition element
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/189861
作者单位	Graduate School of Energy Science and Technology (GEST), Chungnam National University, Daejeon, 34134, South Korea; Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea; KU-KIST Green School, Graduate School of Energy and Environment, Korea University, Seoul, 02841, South Korea; Department of Environmental Engineering, Chungbuk National University, Cheongju, Chungbuk, 28644, South Korea; Division of Energy and Environment Technology, KIST School, University of Science and Technology (UST), Seoul, 02792, South Korea; Research Division, Environmental Technology Institute, Coway, Seoul, 08826, South Korea; KHU-KIST, Department of Converging Science and Technology, Kyung Hee University, Seoul, 02447, South Korea
推荐引用方式 GB/T 7714	Sharma M.,Jang J.-H.,Shin D.Y.,et al. Work function-tailored graphene via transition metal encapsulation as a highly active and durable catalyst for the oxygen reduction reaction[J],2019,12(7).
APA	Sharma M..,Jang J.-H..,Shin D.Y..,Kwon J.A..,Lim D.-H..,...&Yoo S.J..(2019).Work function-tailored graphene via transition metal encapsulation as a highly active and durable catalyst for the oxygen reduction reaction.Energy & Environmental Science,12(7).
MLA	Sharma M.,et al."Work function-tailored graphene via transition metal encapsulation as a highly active and durable catalyst for the oxygen reduction reaction".Energy & Environmental Science 12.7(2019).