Catalytic performance and mechanism of N-CoTi@CoTiO3 catalysts for   oxygen reduction reaction

doi:10.1016/j.nanoen.2015.12.002

CORC > 北京大学 > 工学院

	Catalytic performance and mechanism of N-CoTi@CoTiO3 catalysts for oxygen reduction reaction
	An, Li ; Yan, Huijun ; Chen, Xin ; Li, Biao ; Xia, Zhonghong ; Xia, Dingguo
刊名	NANO ENERGY
	2016
关键词	N-CoTi@CoTiO3 Oxygen reduction reaction Electrocatalyst Surface polarization NITROGEN-DOPED CARBON METAL-FREE ELECTROCATALYSTS PEM FUEL-CELLS FACILE SYNTHESIS PLATINUM NANOPARTICLES GRAPHENE COBALT POLYANILINE NANOSPHERES
DOI	10.1016/j.nanoen.2015.12.002
英文摘要	Alternative non-precious metal catalysts with comparable oxygen reduction reaction activity and durability to Pt-based catalysts are highly desirable for the development of fuel cell. Herein, we report a novel and efficient non-precious electrocatalyst N-CoTi@CoTiO3/C featuring an unusual composite oxide layer on the surface of CoTi alloy nanoparticles, which was investigated using probe-corrected scanning transmission electron microscopy, electron energy-loss spectroscopy, and density functional theory calculations. The N-CoTi@CoTiO3/C catalyst shows superior catalytic performance for oxygen reduction reactions (ORR) in alkaline solutions, with comparable onset potential, half-wave potential to commercial Pt/C and specific activity 1.5 times as high as commercial Pt/C at 0.70 V. Theoretical calculations demonstrate that the surface oxide layer polarization effect caused by the intermetallic CoTi core plays a key role in the high ORR activity of N-CoTi@CoTiO3/C. The enhancement of ORR activity and durability of catalyst by the surface polarization provides a versatile strategy for tuning the catalytic performance of non-noble electrocatalysts. (C) 2015 Elsevier Ltd. All rights reserved.; National Natural Science Foundation of China [11179001]; National High Technology Research and Development Program [2012AA052201, 2012AA110102]; SCI(E); EI; ARTICLE; dgxia@pku.edu.cn; 134-143; 20
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437711]
专题	工学院
推荐引用方式 GB/T 7714	An, Li,Yan, Huijun,Chen, Xin,et al. Catalytic performance and mechanism of N-CoTi@CoTiO3 catalysts for oxygen reduction reaction[J]. NANO ENERGY,2016.
APA	An, Li,Yan, Huijun,Chen, Xin,Li, Biao,Xia, Zhonghong,&Xia, Dingguo.(2016).Catalytic performance and mechanism of N-CoTi@CoTiO3 catalysts for oxygen reduction reaction.NANO ENERGY.
MLA	An, Li,et al."Catalytic performance and mechanism of N-CoTi@CoTiO3 catalysts for oxygen reduction reaction".NANO ENERGY (2016).