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Title: Nanoscale Alloying, Phase-Segregation, and Core-Shell Evolution of Gold-Platinum Nanoparticles and Their Electrocatalytic Effect on Oxygen Reduction Reaction

Abstract

The design and preparation of active and robust bimetallic catalysts require the understanding of the nanoscale alloying and phase-segregation structures. While platinum-based bimetallic catalysts have been widely explored for oxygen reduction reaction in fuel cells, little has been established for the correlation between the nanoscale phase structures and the catalytic properties. Here we describe new findings of the correlation between the nanoscale phase structures and the electrocatalytic properties of gold-platinum nanoparticles. The alloying and partial or complete phase-segregation were probed as a function of composition, size, thermal treatment temperature and duration by X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, electrochemical characterization, and density functional theory modeling. The unprecedented thermal control of the alloying and phase segregation provided the basis for establishing the nanostructure-catalysis correlation, which has immediate implications to the design and nanoengineering of a wide variety of advanced bimetallic functional nanostructures.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
986696
Report Number(s):
PNNL-SA-70644
Journal ID: ISSN 0897-4756; 30446; KP1704020; TRN: US201017%%477
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 22; Journal Issue: 14; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; CATALYSTS; DESIGN; FUEL CELLS; FUNCTIONALS; NANOSTRUCTURES; OXYGEN; SEGREGATION; SIMULATION; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; Environmental Molecular Sciences Laboratory

Citation Formats

Wanjala, Bridgid N., Luo, Jin, Loukrakpam, Rameshwori, Fang, Bin, Mott, Derrick, Njoki, Peter N., Engelhard, Mark, Naslund, H. Richard, Wu, Jia Kai, Wang, Lichang, Malis, Oana, and Zhong, Chuan-Jian. Nanoscale Alloying, Phase-Segregation, and Core-Shell Evolution of Gold-Platinum Nanoparticles and Their Electrocatalytic Effect on Oxygen Reduction Reaction. United States: N. p., 2010. Web. doi:10.1021/cm101109e.
Wanjala, Bridgid N., Luo, Jin, Loukrakpam, Rameshwori, Fang, Bin, Mott, Derrick, Njoki, Peter N., Engelhard, Mark, Naslund, H. Richard, Wu, Jia Kai, Wang, Lichang, Malis, Oana, & Zhong, Chuan-Jian. Nanoscale Alloying, Phase-Segregation, and Core-Shell Evolution of Gold-Platinum Nanoparticles and Their Electrocatalytic Effect on Oxygen Reduction Reaction. United States. doi:10.1021/cm101109e.
Wanjala, Bridgid N., Luo, Jin, Loukrakpam, Rameshwori, Fang, Bin, Mott, Derrick, Njoki, Peter N., Engelhard, Mark, Naslund, H. Richard, Wu, Jia Kai, Wang, Lichang, Malis, Oana, and Zhong, Chuan-Jian. Tue . "Nanoscale Alloying, Phase-Segregation, and Core-Shell Evolution of Gold-Platinum Nanoparticles and Their Electrocatalytic Effect on Oxygen Reduction Reaction". United States. doi:10.1021/cm101109e.
@article{osti_986696,
title = {Nanoscale Alloying, Phase-Segregation, and Core-Shell Evolution of Gold-Platinum Nanoparticles and Their Electrocatalytic Effect on Oxygen Reduction Reaction},
author = {Wanjala, Bridgid N. and Luo, Jin and Loukrakpam, Rameshwori and Fang, Bin and Mott, Derrick and Njoki, Peter N. and Engelhard, Mark and Naslund, H. Richard and Wu, Jia Kai and Wang, Lichang and Malis, Oana and Zhong, Chuan-Jian},
abstractNote = {The design and preparation of active and robust bimetallic catalysts require the understanding of the nanoscale alloying and phase-segregation structures. While platinum-based bimetallic catalysts have been widely explored for oxygen reduction reaction in fuel cells, little has been established for the correlation between the nanoscale phase structures and the catalytic properties. Here we describe new findings of the correlation between the nanoscale phase structures and the electrocatalytic properties of gold-platinum nanoparticles. The alloying and partial or complete phase-segregation were probed as a function of composition, size, thermal treatment temperature and duration by X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, electrochemical characterization, and density functional theory modeling. The unprecedented thermal control of the alloying and phase segregation provided the basis for establishing the nanostructure-catalysis correlation, which has immediate implications to the design and nanoengineering of a wide variety of advanced bimetallic functional nanostructures.},
doi = {10.1021/cm101109e},
journal = {Chemistry of Materials},
issn = {0897-4756},
number = 14,
volume = 22,
place = {United States},
year = {2010},
month = {7}
}