Small-Sized and Contacting Pt-WC Nanostructures on Graphene as Highly Efficient Anode Catalysts for Direct Methanol Fuel Cells

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	Small-Sized and Contacting Pt-WC Nanostructures on Graphene as Highly Efficient Anode Catalysts for Direct Methanol Fuel Cells
	Wang, Ruihong ; Xie, Ying ; Shi, Keying ; Wang, Jianqiang（王建强） ; Tian, Chungui ; Shen, Peikang ; Fu, Honggang
刊名	CHEMISTRY-A EUROPEAN JOURNAL
	2012
卷号	18 期号:24 页码:7443
ISSN号	0947-6539
英文摘要	The synergistic effect between Pt and WC is beneficial for methanol electro-oxidation, and makes PtWC catalyst a promising anode candidate for the direct methanol fuel cell. This paper reports on the design and synthesis of small-sized and contacting PtWC nanostructures on graphene that bring the synergistic effect into full play. Firstly, DFT calculations show the existence of a strong covalent interaction between WC and graphene, which suggests great potential for anchoring WC on graphene with formation of small-sized, well-dispersed WC particles. The calculations also reveal that, when Pt attaches to the pre-existing WC/graphene hybrid, Pt particles preferentially grow on WC rather than graphene. Our experiments confirmed that highly disperse WC nanoparticles (ca. 5 nm) can indeed be anchored on graphene. Also, Pt particles 23 nm in size are well dispersed on WC/graphene hybrid and preferentially grow on WC grains, forming contacting PtWC nanostructures. These results are consistent with the theoretical findings. X-ray absorption fine structure spectroscopy further confirms the intimate contact between Pt and WC, and demonstrates that the presence of WC can facilitate the crystallinity of Pt particles. This new PtWC/graphene catalyst exhibits a high catalytic efficiency toward methanol oxidation, with a mass activity 1.98 and 4.52 times those of commercial PtRu/C and Pt/C catalysts, respectively.
收录类别	SCI
语种	英语
WOS记录号	WOS:000304755700017
公开日期	2013-09-11
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/12913]
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
推荐引用方式 GB/T 7714	Wang, Ruihong,Xie, Ying,Shi, Keying,et al. Small-Sized and Contacting Pt-WC Nanostructures on Graphene as Highly Efficient Anode Catalysts for Direct Methanol Fuel Cells[J]. CHEMISTRY-A EUROPEAN JOURNAL,2012,18(24):7443.
APA	Wang, Ruihong.,Xie, Ying.,Shi, Keying.,Wang, Jianqiang.,Tian, Chungui.,...&Fu, Honggang.(2012).Small-Sized and Contacting Pt-WC Nanostructures on Graphene as Highly Efficient Anode Catalysts for Direct Methanol Fuel Cells.CHEMISTRY-A EUROPEAN JOURNAL,18(24),7443.
MLA	Wang, Ruihong,et al."Small-Sized and Contacting Pt-WC Nanostructures on Graphene as Highly Efficient Anode Catalysts for Direct Methanol Fuel Cells".CHEMISTRY-A EUROPEAN JOURNAL 18.24(2012):7443.