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Title: Ligand-Guided Growth of Alloyed Shells on Intermetallic Seeds as a Route toward Multimetallic Nanocatalysts with Shape-Control

Abstract

In this work, shape-controlled core@shell PdCu@PtCu nanoparticles (NPs) were synthesized by seed-mediated co-reduction. Specifically, cubic-shaped NPs were achieved by selecting tetraoctylammonium bromide (TOAB) and triphenylphosphine (TPP) as capping ligands. Their roles were investigated by incorporating independently each ligand into the reaction and analyzing the products by transmission electron microscopy (TEM). This analysis revealed that the quasi-spherical PdCu seeds acquired cubic shapes during the synthesis and directed shell deposition. This process was mediated by TPP, which was central to achieving monodisperse NPs with shape-control. The synthesis conditions were modified to tune both the thickness and composition of the shells. Evaluation of the NPs as catalysts for the electrooxidation of formic acid found that the NPs with the thinnest Pt-rich shells gave the highest specific activity, with the nanocubic shape also enhancing performance with respect to the spherical counterpart. These results highlight the benefits of integrating compositional, architectural, and shape-control all in one NP construct.

Authors:
 [1];  [1]; ORCiD logo [1]
  1. Indiana Univ., Bloomington, IN (United States)
Publication Date:
Research Org.:
Indiana Univ., Bloomington, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1659495
Grant/Contract Number:  
SC0018961
Resource Type:
Accepted Manuscript
Journal Name:
ChemNanoMat
Additional Journal Information:
Journal Volume: 6; Journal Issue: 5; Journal ID: ISSN 2199-692X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ligand; shape; control; nanoparticles; nanocatalysts

Citation Formats

Bueno, Sandra L. A., Gamler, Jocelyn T. L., and Skrabalak, Sara E. Ligand-Guided Growth of Alloyed Shells on Intermetallic Seeds as a Route toward Multimetallic Nanocatalysts with Shape-Control. United States: N. p., 2020. Web. https://doi.org/10.1002/cnma.202000026.
Bueno, Sandra L. A., Gamler, Jocelyn T. L., & Skrabalak, Sara E. Ligand-Guided Growth of Alloyed Shells on Intermetallic Seeds as a Route toward Multimetallic Nanocatalysts with Shape-Control. United States. https://doi.org/10.1002/cnma.202000026
Bueno, Sandra L. A., Gamler, Jocelyn T. L., and Skrabalak, Sara E. Fri . "Ligand-Guided Growth of Alloyed Shells on Intermetallic Seeds as a Route toward Multimetallic Nanocatalysts with Shape-Control". United States. https://doi.org/10.1002/cnma.202000026. https://www.osti.gov/servlets/purl/1659495.
@article{osti_1659495,
title = {Ligand-Guided Growth of Alloyed Shells on Intermetallic Seeds as a Route toward Multimetallic Nanocatalysts with Shape-Control},
author = {Bueno, Sandra L. A. and Gamler, Jocelyn T. L. and Skrabalak, Sara E.},
abstractNote = {In this work, shape-controlled core@shell PdCu@PtCu nanoparticles (NPs) were synthesized by seed-mediated co-reduction. Specifically, cubic-shaped NPs were achieved by selecting tetraoctylammonium bromide (TOAB) and triphenylphosphine (TPP) as capping ligands. Their roles were investigated by incorporating independently each ligand into the reaction and analyzing the products by transmission electron microscopy (TEM). This analysis revealed that the quasi-spherical PdCu seeds acquired cubic shapes during the synthesis and directed shell deposition. This process was mediated by TPP, which was central to achieving monodisperse NPs with shape-control. The synthesis conditions were modified to tune both the thickness and composition of the shells. Evaluation of the NPs as catalysts for the electrooxidation of formic acid found that the NPs with the thinnest Pt-rich shells gave the highest specific activity, with the nanocubic shape also enhancing performance with respect to the spherical counterpart. These results highlight the benefits of integrating compositional, architectural, and shape-control all in one NP construct.},
doi = {10.1002/cnma.202000026},
journal = {ChemNanoMat},
number = 5,
volume = 6,
place = {United States},
year = {2020},
month = {2}
}

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