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Title: Synthetic Routes to Shaped AuPt Core-Shell Particles with Smooth Surfaces Based on Design Rules for Au Nanoparticle Growth

Abstract

Widespread implementation of polymer electrolyte fuel cells is limited by the performance of Pt catalysts because of the high cost of Pt and the propensity for catalyst surfaces to lose activity as a result of surface poisoning. AuPt core–shell particles show potential to address these issues, yet provide new challenges because of the immiscibility of Au and Pt during particle growth. In this work, AuPt core–shell particles with distinct shapes are made using a one-pot synthesis under mild reaction conditions by exploiting the difference in reduction rate between Au and Pt ions. Employing this approach results in smooth, well-defined surfaces, rather than the more commonly observed dendritic or island-like Pt shells that generally form when presynthesized Au cores are used to template Au-core/Pt-shell particle growth. By using the established mechanisms of Au nanoparticle growth, facile modification of particle shape and size is achieved with no significant change to the Pt surface. As a result, this approach also offers a synthetic route to the preparation of more complex AuPt nanostructures, such as those with exotic shapes and high-energy surface facets.

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Wesleyan Univ., Middletown, CT (United States)
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States). Energy Frontier Research Center (EFRC) Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470246
Alternate Identifier(s):
OSTI ID: 1429547
Grant/Contract Number:  
SC0012573
Resource Type:
Accepted Manuscript
Journal Name:
Particle & Particle Systems Characterization
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5; Related Information: IMASC partners with Harvard University (lead); Fritz Haber Institute; Lawrence Berkeley National Laboratory; Lawrence Livermore National Laboratory; University of Kansas; Tufts University; Journal ID: ISSN 0934-0866
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; coreduction; core–shell nanoparticles; gold; platinum; shape control

Citation Formats

Stone, Aidan L., King, Melissa E., McDarby, Sean P., Robertson, Daniel D., and Personick, Michelle L. Synthetic Routes to Shaped AuPt Core-Shell Particles with Smooth Surfaces Based on Design Rules for Au Nanoparticle Growth. United States: N. p., 2018. Web. doi:10.1002/ppsc.201700401.
Stone, Aidan L., King, Melissa E., McDarby, Sean P., Robertson, Daniel D., & Personick, Michelle L. Synthetic Routes to Shaped AuPt Core-Shell Particles with Smooth Surfaces Based on Design Rules for Au Nanoparticle Growth. United States. doi:10.1002/ppsc.201700401.
Stone, Aidan L., King, Melissa E., McDarby, Sean P., Robertson, Daniel D., and Personick, Michelle L. Sun . "Synthetic Routes to Shaped AuPt Core-Shell Particles with Smooth Surfaces Based on Design Rules for Au Nanoparticle Growth". United States. doi:10.1002/ppsc.201700401. https://www.osti.gov/servlets/purl/1470246.
@article{osti_1470246,
title = {Synthetic Routes to Shaped AuPt Core-Shell Particles with Smooth Surfaces Based on Design Rules for Au Nanoparticle Growth},
author = {Stone, Aidan L. and King, Melissa E. and McDarby, Sean P. and Robertson, Daniel D. and Personick, Michelle L.},
abstractNote = {Widespread implementation of polymer electrolyte fuel cells is limited by the performance of Pt catalysts because of the high cost of Pt and the propensity for catalyst surfaces to lose activity as a result of surface poisoning. AuPt core–shell particles show potential to address these issues, yet provide new challenges because of the immiscibility of Au and Pt during particle growth. In this work, AuPt core–shell particles with distinct shapes are made using a one-pot synthesis under mild reaction conditions by exploiting the difference in reduction rate between Au and Pt ions. Employing this approach results in smooth, well-defined surfaces, rather than the more commonly observed dendritic or island-like Pt shells that generally form when presynthesized Au cores are used to template Au-core/Pt-shell particle growth. By using the established mechanisms of Au nanoparticle growth, facile modification of particle shape and size is achieved with no significant change to the Pt surface. As a result, this approach also offers a synthetic route to the preparation of more complex AuPt nanostructures, such as those with exotic shapes and high-energy surface facets.},
doi = {10.1002/ppsc.201700401},
journal = {Particle & Particle Systems Characterization},
number = 5,
volume = 35,
place = {United States},
year = {2018},
month = {3}
}

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