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Title: Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters

Abstract

We demonstrated that platinum (Pt) oxygen-reduction fuel-cell electrocatalysts can be stabilized against dissolution under potential cycling regimes (a continuing problem in vehicle applications) by modifying Pt nanoparticles with gold (Au) clusters. This behavior was observed under the oxidizing conditions of the O{sub 2} reduction reaction and potential cycling between 0.6 and 1.1 volts in over 30,000 cycles. There were insignificant changes in the activity and surface area of Au-modified Pt over the course of cycling, in contrast to sizable losses observed with the pure Pt catalyst under the same conditions. In situ x-ray absorption near-edge spectroscopy and voltammetry data suggest that the Au clusters confer stability by raising the Pt oxidation potential.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930625
Report Number(s):
BNL-80964-2008-JA
Journal ID: ISSN 0193-4511; SCEHDK; TRN: US200901%%1
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Science; Journal Volume: 315; Journal Issue: 5809
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; FUEL CELLS; ELECTROCATALYSTS; GOLD; PLATINUM; ADDITIVES; STABILIZATION; OXIDATION; national synchrotron light source

Citation Formats

Zhang,J., Sasaki, K., Sutter, E., and Adzic, R. Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters. United States: N. p., 2007. Web. doi:10.1126/science.1134569.
Zhang,J., Sasaki, K., Sutter, E., & Adzic, R. Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters. United States. doi:10.1126/science.1134569.
Zhang,J., Sasaki, K., Sutter, E., and Adzic, R. Mon . "Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters". United States. doi:10.1126/science.1134569.
@article{osti_930625,
title = {Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters},
author = {Zhang,J. and Sasaki, K. and Sutter, E. and Adzic, R.},
abstractNote = {We demonstrated that platinum (Pt) oxygen-reduction fuel-cell electrocatalysts can be stabilized against dissolution under potential cycling regimes (a continuing problem in vehicle applications) by modifying Pt nanoparticles with gold (Au) clusters. This behavior was observed under the oxidizing conditions of the O{sub 2} reduction reaction and potential cycling between 0.6 and 1.1 volts in over 30,000 cycles. There were insignificant changes in the activity and surface area of Au-modified Pt over the course of cycling, in contrast to sizable losses observed with the pure Pt catalyst under the same conditions. In situ x-ray absorption near-edge spectroscopy and voltammetry data suggest that the Au clusters confer stability by raising the Pt oxidation potential.},
doi = {10.1126/science.1134569},
journal = {Science},
number = 5809,
volume = 315,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}