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; Xing, W
2018
发表期刊NANO ENERGY
ISSN2211-2855
卷号46页码:396-403
文章类型期刊论文
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.
关键词Metal-organic Frameworks Cytochrome-c-oxidase Fuel-cell Cathode Reaction Catalysts Fe/n/c-catalysts Acidic Media Iron Electrocatalysts Carbon Spectroscopy
DOI10.1016/j.nanoen.2018.02.025
收录类别SCI
语种英语
WOS记录号WOS:000427924000046
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/29036
专题中科院上海应用物理研究所2011-2018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
11.Xing, W
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.
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