Identification of binuclear Co2N5 active sites for oxygen reduction reaction with more than one magnitude higher activity than single atom CoN4 site

doi:10.1016/j.nanoen.2018.02.025

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Identification of binuclear Co2N5 active sites for oxygen reduction reaction with more than one magnitude higher activity than single atom CoN4 site
	Xiao, ML ; Zhang, H ; Chen, YT ; Zhu, JB ; Gao, LQ ; Jin, Z ; Ge, JJ ; Jiang, Z ; Chen, SL ; Liu, CP
刊名	NANO ENERGY
	2018
卷号	46 页码:396-403
关键词	Metal-organic Frameworks Cytochrome-c-oxidase Fuel-cell Cathode Reaction Catalysts Fe/n/c-catalysts Acidic Media Iron Electrocatalysts Carbon Spectroscopy
ISSN号	2211-2855
DOI	10.1016/j.nanoen.2018.02.025
文献子类	期刊论文
英文摘要	Herein, a novel binuclear active site structure, Co2NxCy, is intentionally designed and successfully fabricated to efficiently catalyze the oxygen reduction reaction (ORR), which is achieved by precisely controlling the atomic scale structure of bimetal-organic frameworks before pyrolysis. Through discovering a two-atom site with Co-Co distance at 2.1-2.2 angstrom from aberration-corrected scanning transmission electron microscopy (STEM), as well as a novel shortened Co-Co path (2.12 angstrom) from the X-ray absorption spectroscopy, we for the first time identified the binuclear Co2NX site in the pyrolyzed catalyst. Combined with density functional theory (DFT) calculation, the structure is further confirmed as Co2N5. Excitingly, the Co2N5 site performs approximately 12 times higher activity than the conventional CoN4 site and the corresponding catalyst shows unprecedented catalytic activity in acidic electrolyte with half-wave potential of 0.79 V, approaching the commercial Pt/C catalyst and presenting the best one among the Co-N-C catalysts. Theoretical density functional theory calculations reveal that the novel binuclear site exhibits considerably reduced thermodynamic barrier towards ORR, thus contributing to the much higher intrinsic activity. Our finding opens up a new path to design efficient M-N-x/C catalysts, thus pushing the fuel cell industry field one step ahead.
语种	英语
WOS记录号	WOS:000427924000046
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/29036]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Xiao, ML 2.Zhang, H 3.Chen, YT 4.Zhu, JB 5.Gao, LQ 6.Jin, Z 7.Ge, JJ 8.Jiang, Z 9.Chen, SL 10.Liu, CP
推荐引用方式 GB/T 7714	Xiao, ML,Zhang, H,Chen, YT,et al. Identification of binuclear Co2N5 active sites for oxygen reduction reaction with more than one magnitude higher activity than single atom CoN4 site[J]. NANO ENERGY,2018,46:396-403.
APA	Xiao, ML.,Zhang, H.,Chen, YT.,Zhu, JB.,Gao, LQ.,...&Xing, W.(2018).Identification of binuclear Co2N5 active sites for oxygen reduction reaction with more than one magnitude higher activity than single atom CoN4 site.NANO ENERGY,46,396-403.
MLA	Xiao, ML,et al."Identification of binuclear Co2N5 active sites for oxygen reduction reaction with more than one magnitude higher activity than single atom CoN4 site".NANO ENERGY 46(2018):396-403.