Growth mechanism and active site probing of Fe3C@N-doped carbon nanotubes/C catalysts: guidance for building highly efficient oxygen reduction electrocatalysts

	Growth mechanism and active site probing of Fe3C@N-doped carbon nanotubes/C catalysts: guidance for building highly efficient oxygen reduction electrocatalysts
	Zhu,Jianbing; Xiao,Meiling; Liu,Changpeng; Ge,Junjie; St-Pierre,Jean; Xing,Wei
刊名	journal of materials chemistry a
	2015
卷号	3 期号:43 页码:21451-21459
关键词	METAL-FREE ELECTROCATALYSTS ELECTROLYTE FUEL-CELLS SYNERGISTIC CATALYST GRAPHENE IRON COBALT OXIDE ACID
通讯作者	xing,w
英文摘要	non-platinum (np) electrocatalysts with high activity and durability for oxygen reduction reactions (orr) are required for fuel cells and other renewable systems. to avoid trial-and-error methods and achieve the rational design and synthesis of efficient np catalysts, in-depth knowledge of the formation/growth mechanism of nanocatalysts and the origin of active sites is highly desirable. here, we report a new class of np catalysts with a novel structure of fe3c encapsulated in n-doped carbon nanotubes/c. we study the formation mechanism of the nanostructure to pave the way for controlled fabrication of high-performance np catalysts. the encapsulation of iron into carbon occurs during the first step of cnt growth and the surface functional groups on carbon black are identified as being essential for forming cnts. the catalyst shows ultrahigh catalytic performance in both acid and alkaline media. we also examine the structure-performance dependency. the catalytic performance is highly dependent on the nanostructure and the encapsulation of fe3c. fe affects the catalytic performance through electronic effects rather than by directly participating in the active sites. this result is confirmed by dft calculations, which show an increase in the density of states and a reduction in the local work function, xps studies, and electrochemical measurements. the likelihood of n participating in the active sites is low because the catalytic performance does not depend on pyridinic and graphitic n.
收录类别	SCI
语种	英语
WOS记录号	WOS:000364020400007
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/64650]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Zhu,Jianbing,Xiao,Meiling,Liu,Changpeng,et al. Growth mechanism and active site probing of Fe3C@N-doped carbon nanotubes/C catalysts: guidance for building highly efficient oxygen reduction electrocatalysts[J]. journal of materials chemistry a,2015,3(43):21451-21459.
APA	Zhu,Jianbing,Xiao,Meiling,Liu,Changpeng,Ge,Junjie,St-Pierre,Jean,&Xing,Wei.(2015).Growth mechanism and active site probing of Fe3C@N-doped carbon nanotubes/C catalysts: guidance for building highly efficient oxygen reduction electrocatalysts.journal of materials chemistry a,3(43),21451-21459.
MLA	Zhu,Jianbing,et al."Growth mechanism and active site probing of Fe3C@N-doped carbon nanotubes/C catalysts: guidance for building highly efficient oxygen reduction electrocatalysts".journal of materials chemistry a 3.43(2015):21451-21459.