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Temperature‐Driven Restructuring of Silver on AuAg Porous Nanotubes: Impact on CO Oxidation
Author(s) -
Costa Jean C. S.,
Gonçalves Renato V.,
TeixeiraNeto Érico,
Rossi Liane M.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601512
Subject(s) - materials science , catalysis , x ray photoelectron spectroscopy , chemical engineering , galvanic cell , porosity , scanning electron microscope , metal , thermal treatment , nanotechnology , metallurgy , chemistry , composite material , biochemistry , engineering
Abstract Gold porous nanotubes (PNTs) prepared by the galvanic replacement reaction between HAuCl 4 and a sacrificial metal nanowire have received attention as a platform for developing self‐sustained catalysts. However, due to an alloying process, the PNT contains a complex mixture of the two metals. Their thermal behavior, e. g., atom restructuring and morphological changes, under reaction conditions has been scarcely studied and difficult to predict. Here, we demonstrate that restructuring of silver atoms occurs after the thermal treatment of AuAg PNTs obtained through galvanic replacement reaction. Using various characterization techniques such as X‐ray diffraction, analytical electron microscopy, and X‐ray photoelectron spectroscopy, we were able to elucidate the structure and surface composition of this novel nanoarchitecture, which approaches an Ag nanoparticle‐decorated AuAg PNT like structure. The surface changes were studied through the catalytic oxidation of CO, a model reaction for surface science investigations.