Ag–Pt Compositional Intermetallics Made from Alloy Nanoparticles
Abstract
Intermetallics are compounds with long-range structural order that often lies in a state of thermodynamic minimum. They are usually considered as favorable structures for catalysis due to their high activity and robust stability. However, formation of intermetallic compounds is often regarded as element specific. For instance, Ag and Pt do not form alloy in bulk phase through the conventional metallurgy approach in almost the entire range of composition. Herein, we demonstrate a bottom-up approach to create a new Ag–Pt compositional intermetallic phase from nanoparticles. By thermally treating the corresponding alloy nanoparticles in inert atmosphere, we obtained an intermetallic material that has an exceptionally narrow Ag/Pt ratio around 52/48 to 53/47, and a structure of interchangeable closely packed Ag and Pt layers with 85% on tetrahedral and 15% on octahedral sites. This rather unique stacking results in wavy patterns of Ag and Pt planes revealed by scanning transmission electron microscope (STEM). Finally, this Ag–Pt compositional intermetallic phase is highly active for electrochemical oxidation of formic acid at low anodic potentials, 5 times higher than its alloy nanoparticles, and 29 times higher than the reference Pt/C at 0.4 V (vs RHE) in current density.
- Authors:
-
- University of Illinois at Urbana—Champaign, Department of Chemical and Biomolecular Engineering, 114 Roger Adam Laboratory, MC-712, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
- University of Illinois at Urbana—Champaign, Department of Materials Science and Engineering, 1006 Materials Research Laboratory, 104 South Goodwin Avenue, Urbana, Illinois 61801, United States
- Publication Date:
- Research Org.:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1323986
- Alternate Identifier(s):
- OSTI ID: 1329044
- Grant/Contract Number:
- DEFG02-01ER45923; FG02-01ER45923
- Resource Type:
- Published Article
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Name: Nano Letters Journal Volume: 16 Journal Issue: 10; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ag−Pt; electrocatalysis; intermetallic compound; nanoparticle processing
Citation Formats
Pan, Yung-Tin, Yan, Yuqi, Shao, Yu-Tsun, Zuo, Jian-Min, and Yang, Hong. Ag–Pt Compositional Intermetallics Made from Alloy Nanoparticles. United States: N. p., 2016.
Web. doi:10.1021/acs.nanolett.6b03302.
Pan, Yung-Tin, Yan, Yuqi, Shao, Yu-Tsun, Zuo, Jian-Min, & Yang, Hong. Ag–Pt Compositional Intermetallics Made from Alloy Nanoparticles. United States. https://doi.org/10.1021/acs.nanolett.6b03302
Pan, Yung-Tin, Yan, Yuqi, Shao, Yu-Tsun, Zuo, Jian-Min, and Yang, Hong. Mon .
"Ag–Pt Compositional Intermetallics Made from Alloy Nanoparticles". United States. https://doi.org/10.1021/acs.nanolett.6b03302.
@article{osti_1323986,
title = {Ag–Pt Compositional Intermetallics Made from Alloy Nanoparticles},
author = {Pan, Yung-Tin and Yan, Yuqi and Shao, Yu-Tsun and Zuo, Jian-Min and Yang, Hong},
abstractNote = {Intermetallics are compounds with long-range structural order that often lies in a state of thermodynamic minimum. They are usually considered as favorable structures for catalysis due to their high activity and robust stability. However, formation of intermetallic compounds is often regarded as element specific. For instance, Ag and Pt do not form alloy in bulk phase through the conventional metallurgy approach in almost the entire range of composition. Herein, we demonstrate a bottom-up approach to create a new Ag–Pt compositional intermetallic phase from nanoparticles. By thermally treating the corresponding alloy nanoparticles in inert atmosphere, we obtained an intermetallic material that has an exceptionally narrow Ag/Pt ratio around 52/48 to 53/47, and a structure of interchangeable closely packed Ag and Pt layers with 85% on tetrahedral and 15% on octahedral sites. This rather unique stacking results in wavy patterns of Ag and Pt planes revealed by scanning transmission electron microscope (STEM). Finally, this Ag–Pt compositional intermetallic phase is highly active for electrochemical oxidation of formic acid at low anodic potentials, 5 times higher than its alloy nanoparticles, and 29 times higher than the reference Pt/C at 0.4 V (vs RHE) in current density.},
doi = {10.1021/acs.nanolett.6b03302},
journal = {Nano Letters},
number = 10,
volume = 16,
place = {United States},
year = {Mon Sep 12 00:00:00 EDT 2016},
month = {Mon Sep 12 00:00:00 EDT 2016}
}
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https://doi.org/10.1021/acs.nanolett.6b03302
https://doi.org/10.1021/acs.nanolett.6b03302
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Cited by: 33 works
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