【摘 要】
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Porous metal nanostructures exhibit excellent catalytic properties due to their high surface-to-volume ratios and abundant catalytic active sites.However,it is still challenging to control nanopores density and structural features in a facile route and th
【机 构】
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College of Science,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College o
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Porous metal nanostructures exhibit excellent catalytic properties due to their high surface-to-volume ratios and abundant catalytic active sites.However,it is still challenging to control nanopores density and structural features in a facile route and the preparation of porous alloy nanorods for catalytic appli-cation has not been well explored.In this work,we demonstrate a synthetic strategy to fabricate highly porous Au-Ag alloy nanorods (P-AuAgNRs) by critically dealloying Ag atoms from homogeneous solid Au-Ag alloy nanorods (AuAgNRs).Combining the merits of the tunable plasmonic properties of noble metal nanorods,excellent stabilities of alloys,and superior catalytic activities of porous structures,we use the P-AuAgNRs as a Raman probe for the in situ monitoring of the catalytic oxidation of 3,3\',5,5\'tetram-ethylbenzidine (TMB) and reduction of 4-nitrothiophenol (4-NTP).We also compare their composition-dependent catalytic activities.The results show that P-AuAgNRs possess superior chemical stability and higher catalytic activity than those of core-shell structures due to synergistic structural and chemical mechanisms.This strategy provides a predictive design approach for the next-generation alloy catalysts with high-performance.
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