High activity of cubic PtRh alloys supported on graphene towards ethanol electrooxidation

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	High activity of cubic PtRh alloys supported on graphene towards ethanol electrooxidation
	Rao, Lu ; Jiang, Yan-Xia ; Zhang, Bin-Wei ; Cai, Yuan-Rong ; Sun, Shi-Gang ; Jiang YX(姜艳霞) ; Sun SG(孙世刚)
刊名	http://dx.doi.org/10.1039/c3cp55059a
	2014
关键词	PT/C CATALYTIC CATHODE DURABILITY ENHANCEMENT PLATINUM NANOCRYSTALS OXIDIZING ETHANOL RECENT PROGRESS FUEL-CELL OXIDATION ELECTROCATALYSTS CO2 RH
英文摘要	National Science Foundation of China [21273180, 21021002, 21361140374]; Cubic PtRh alloys supported on graphene (PtxRhy/GN) with different atomic ratio of Pt and Rh were directly synthesized for the first time using the modified polyol method with Br- for the shape-directing agents. The process didn't use surface-capping agents such as PVP that easily occupy the active sites of electrocatalysts and are difficult to remove. Graphene is the key factor for cubic shape besides Br- and keeping catalysts high-dispersed. The X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to characterize the structure and morphology of these electrocatalysts. The results showed that they were composed of homogeneous cubic PtRh alloys. Traditional electrochemical methods, such as cyclic voltammetry and chronoamperometry, were used to investigate the electrocatalytic properties of PtxRhy/GN towards ethanol electrooxidation. It can be seen that PtxRhy/GN with all atomic ratios exhibited high catalytic activity, and the most active one has a composition with Pt : Rh = 9: 1 atomic ratio. Electrochemical in situ FTIR spectroscopy was used to evaluate the cleavage of C-C bond in ethanol at room temperature in acidic solutions, the results illustrated that Rh in an alloy can promote the split of C-C bond in ethanol, and the alloy catalyst with atomic ratio Pt : Rh = 1 : 1 showed obviously better performance for the C-C bond breaking in ethanol and higher selectivity for the enhanced activity of ethanol complete oxidation to CO2 than alloys with other ratios of Pt and Rh. The investigation indicates that high activity of PtxRhy/GN electrocatalyst towards ethanol oxidation is due to the specific shape of alloys and the synergistic effect of two metal elements as well as graphene support.
语种	英语
出版者	ROYAL SOC CHEMISTRY
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89426]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Rao, Lu,Jiang, Yan-Xia,Zhang, Bin-Wei,et al. High activity of cubic PtRh alloys supported on graphene towards ethanol electrooxidation[J]. http://dx.doi.org/10.1039/c3cp55059a,2014.
APA	Rao, Lu.,Jiang, Yan-Xia.,Zhang, Bin-Wei.,Cai, Yuan-Rong.,Sun, Shi-Gang.,...&孙世刚.(2014).High activity of cubic PtRh alloys supported on graphene towards ethanol electrooxidation.http://dx.doi.org/10.1039/c3cp55059a.
MLA	Rao, Lu,et al."High activity of cubic PtRh alloys supported on graphene towards ethanol electrooxidation".http://dx.doi.org/10.1039/c3cp55059a (2014).