Synthesis of Pd Nanocrystals Enclosed by {100} Facets and with Sizes 〈10 nm for Application in CO Oxidation

作     者：Mingshang Jin Hongyang Liu Hui Zhang Zhaoxiong Xie Jingyue Liu Younan Xia 

作者机构：Department of Biomedical Engineering Washington University St. Louis Missouri 63130 USA Center for Nanoscience University of Missouri St. Louis Missouri 63121 USA State Key Laboratory for Physical Chemistry of Solid Surfaces Department of Chemistry Xiamen University Xiamen Fujian 361005 China Department of Physics and Astronomy and Department of Chemistry and Biochemistry University of Missouri St. Louis Missouri 63121 USA 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2011年第4卷第1期

页      面：83-91页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 081705[工学-工业催化] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070205[理学-凝聚态物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：美国国家科学基金 the China Scholarship Council (CSC) the Nano Research Facility (NRF) the National Nanotechnology InfrastructureNetwork (NNIN) 美国国家科学基金 

主　　题：Palladium nanocubes CO oxidation size-dependence 

摘      要：The catalytic activity of noble-metal nanocrystals is mainly determined by their sizes and the facets exposed on the surface. For single crystals, it has been demonstrated that the Pd（100） surface is catalytically more active than both Pd（110） and Pd（111） surfaces for the CO oxidation reaction. Here we report the synthesis of Pd nanocrystals enclosed by {100} facets with controllable sizes in the range of 6-18 nm by manipulating the rate of reduction of the precursor. UV-vis spectroscopy studies indicate that the rate of reduction of Na2PdC14 can be controlled by adjusting the concentrations of Br- and C1- ions added to the reaction mixture. Pd nanocrystals with different sizes were immobilized on ZnO nanowires and evaluated as catalysts for CO oxidation. We found that the activity of this catalytic system for CO oxidation showed a strong dependence on the nanocrystal size. When the size of the Pd nanocrystals was reduced from 18 nm to 6 nm, the maximum conversion rate was significantly enhanced by a factor of -10 and the corresponding maximum conversion temperature was lowered by -80℃.