Initial Reaction Mechanism of Platinum Nanoparticle in Methanol-Water System and the Anomalous Catalytic Effect of Water

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	Initial Reaction Mechanism of Platinum Nanoparticle in Methanol-Water System and the Anomalous Catalytic Effect of Water
	Chen, SM; Yang, QY; Wang, HH; Zhang, S; Li, J; Wang, Y; Chu, WS; Ye, Q; Song, L
刊名	NANO LETTERS
	2015
卷号	15 期号:9 页码:5961—5968
关键词	RAY-ABSORPTION SPECTROSCOPY NANOCRYSTALS CLUSTERS METAL PRINCIPLES MORPHOLOGY REDUCTION COMPLEXES GROWTH
ISSN号	1530-6984
通讯作者	Chen, SM (reprint author), Univ Sci & Technol China, CAS Hefei Sci Ctr, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China.
英文摘要	Understanding the detailed reaction mechanism in the early stage of noble metal nanoparticles is very critical for controlling the final crystal's size, morphology, and properties. Here, we report a systematic study on the initial reaction mechanism of Pt nanoparticles in methanol-water system and demonstrate an anomalous catalytic effect of H2O on the reduction of H2PtCl6 to Pt nanoparticles using a combination of UV-vis, X-ray absorption spectroscopy (XAS), liquid chromatography mass spectrometry (LCMS), and first-principles calculation methods. The observations reveal the transformation route [PtCl6](2-) -> [PtCl5(CH3O)](2-) -> [PtCl4](2-) -> [PtCl3(CH3O)](2-) -> [PtCl2](2-) and finally to form Pt nanoparticles in a pure CH3OH solution. With 10 vol % water adding in the CH3OH solution, a new and distinct chemical reduction pathway is found in which the precursors change from [PtCl6](2-) to [PtCl5(CH3O)(H2O)](2-) to [PtCl4](2-) to [PtCl3(CH3O)(H2O)](2-) to [PtCl2](2-) and to Pt nanoparticles. Notably, the supernumerary water molecular can significantly accelerate the rate of chemical reduction and greatly shorten the reaction time. This work not only elucidates the initial reaction mechanism of Pt nanoparticles but also highlights the pronounced influence of H2O on the reaction pathway, which will provide useful insights for understanding the formation mechanism of noble metal nanoparticles and open up a high efficient way to synthesize new functional nanomaterial.
语种	英语
WOS记录号	WOS:000361252700046
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/24964]
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	Chen, SM,Yang, QY,Wang, HH,et al. Initial Reaction Mechanism of Platinum Nanoparticle in Methanol-Water System and the Anomalous Catalytic Effect of Water[J]. NANO LETTERS,2015,15(9):5961—5968.
APA	Chen, SM.,Yang, QY.,Wang, HH.,Zhang, S.,Li, J.,...&Song, L.(2015).Initial Reaction Mechanism of Platinum Nanoparticle in Methanol-Water System and the Anomalous Catalytic Effect of Water.NANO LETTERS,15(9),5961—5968.
MLA	Chen, SM,et al."Initial Reaction Mechanism of Platinum Nanoparticle in Methanol-Water System and the Anomalous Catalytic Effect of Water".NANO LETTERS 15.9(2015):5961—5968.