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; Chen, SM (reprint author), Univ Sci & Technol China, CAS Hefei Sci Ctr, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China.
2015
发表期刊NANO LETTERS
ISSN1530-6984
卷号15期号:9页码:5961—5968
文章类型期刊文献
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.
关键词Ray-absorption Spectroscopy Nanocrystals Clusters Metal Principles Morphology Reduction Complexes Growth
语种英语
WOS记录号WOS:000361252700046
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/24964
专题中科院上海应用物理研究所2011-2018年
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.
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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.,...&Chen, SM .(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.
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