Surface Structures and Electrochemical Activities of Pt Overlayers on Ir Nanoparticles
- Surface Structures and Electrochemical Activities of Pt Overlayers on Ir Nanoparticles
- 이국승; 유성종; 안도천; 전태열; 최광현; 박인수; 성영은
- Ir-Pt core-shell alloy catalysts; Methanol oxidation; direct methanol fuel cell
- Issue Date
- VOL 27, NO 6, 3128-3137
- Pt overlayers were deposited on carbon-supported Ir
nanoparticles with various coverages. Structural and electrochemical
characterizations were performed using transmission electron microscopy
(TEM), X-ray diffraction, high-resolution powder diffraction
(HRPD), X-ray photoelectron spectroscopy (XPS), X-ray absorption
near-edge spectroscopy (XANES), cyclic voltammetry (CV),
CO stripping voltammetry, and N2O reduction. The surface of Ir
nanoparticles was covered with Pt overlayers with thickness varying
from the submonolayer scale to more than two monolayers. Surface
analyses such as CV and CO stripping voltammetry indicated that
the Pt overlayers were uniformly deposited on the Ir nanoparticles,
and the resultant Pt overlayers exhibited gradual changes in surface
characteristics toward the Pt surface as the surface coverage increased.
The distinct CO stripping characteristics and the enhanced
Pt utilization affected electrocatalytic activities for methanol oxidation.
The electrochemical stability of the Pt overlayer was compared
with a commercial carbon-supported Pt catalyst by conducting a
potential cycling experiment.
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