期刊
NANO LETTERS
卷 16, 期 9, 页码 5669-5674出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02317
关键词
Defects; silver; catalysis; nanowire; silane
类别
资金
- National Natural Science Foundation of China (NSFC) [21403160, 21471123]
- Xi'an Jiaotong University
- China Postdoctoral Science Foundation [2015M582634]
- U.S. National Science Foundation [CHE-1308587]
Structural defects have-been proven to determine many of the materials' properties. Here, we demonstrate a unique approach to the creation of Ag nanowires with high-density defects through controllable nanoparticles coalescence-in one-dimensional pores of mesoporous silica. The-density of defects can be easily adjusted by tuning the annealing temperature during synthetic process. The high-density defects promote the adsorption and activation of more reactants on the surface of Ag nanowires during-Catalytic reactions. As a result; the as-prepared Ag nanowires exhibit enhanced activities in catalyzing dehydrogenative coupling reaction Of silane in. terms of apparent activation energy, and turnover frequency (TOF). We show further that the silane conversion rate can be,enhanced by maximizing the defect,density and thus' the number of active sites :on the Ag nanowires, reaching a remarkable TOF of 8288 which represents the:highest TOF that has been achieved by far,on Ag catalysts. This work not only-proves the important role of structural defects in catalysis but also provides a new and general strategy for;constructing high-density defects in metal catalysts.
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