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Synthesis of bimetallic Pt/Pd nanotues and their enhanced catalytic activity in methanol electro-oxidaiton
- POSTED DATE : 2014-02-12
- WRITER :
- HIT : 3053
- Researcher : Sang Min Kim, Sungho Park*
In this work, we successfully synthesized a vertically-aligned bimetallic Pt/Pd nanotube array by using
anodic aluminum oxide (AAO) template-assisted electro-deposition. The resulting nanostructures
exhibited higher catalytic activity in methanol oxidation than either individual constituent (Pt or Pd).
The facile synthesis of the Pt/Pd tubular nanostructure was inspired by the previously developed thinwalled
Pd nanotube formation mechanism, which takes advantage of the surface hydroxyl chemistry of
the AAO template. The content of Pt in the bimetallic Pt/Pd nanotubes could reach up to 50%. The
inner and outer walls of the perpendicular open Pt/Pd nanotubes increased the ratio of the surface
area to the mass relative to the solid nanorod structure, resulting in a higher current density in
methanol oxidation. More importantly, the synergistic electronic effect between Pt and Pd gave rise to
the enhanced catalytic activity in methanol oxidation, as evidenced from comparisons of the onset
potentials and CO oxidation behaviors. Thus, vertically-aligned bimetallic Pt/Pd nanotubes may act as a
better catalyst in methanol oxidation than the single-component Pt counterpart.
anodic aluminum oxide (AAO) template-assisted electro-deposition. The resulting nanostructures
exhibited higher catalytic activity in methanol oxidation than either individual constituent (Pt or Pd).
The facile synthesis of the Pt/Pd tubular nanostructure was inspired by the previously developed thinwalled
Pd nanotube formation mechanism, which takes advantage of the surface hydroxyl chemistry of
the AAO template. The content of Pt in the bimetallic Pt/Pd nanotubes could reach up to 50%. The
inner and outer walls of the perpendicular open Pt/Pd nanotubes increased the ratio of the surface
area to the mass relative to the solid nanorod structure, resulting in a higher current density in
methanol oxidation. More importantly, the synergistic electronic effect between Pt and Pd gave rise to
the enhanced catalytic activity in methanol oxidation, as evidenced from comparisons of the onset
potentials and CO oxidation behaviors. Thus, vertically-aligned bimetallic Pt/Pd nanotubes may act as a
better catalyst in methanol oxidation than the single-component Pt counterpart.
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