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Title: Platinum–nickel nanowire catalysts with composition-tunable alloying and faceting for the oxygen reduction reaction

Abstract

The ability to tune the alloying properties and faceting characteristics of bimetallic nanocatalysts is essential for designing catalysts with enhanced activity and stability through optimizing strain and ligand effects, which is an important frontier for designing advanced materials as catalysts for fuel cell applications. This report describes composition-controlled alloying and faceting of platinum–nickel nanowires (PtNi NWs) for the electrocatalytic oxygen reduction reaction. The PtNi NWs are synthesized by a surfactant-free method and are shown to display bundled morphologies of nano-tetrahedra or nanowires, featuring an ultrathin and irregular helix morphology with composition-tunable facets. Using high-energy synchrotron X-ray diffraction coupled with atomic pair distribution function analysis, lattice expansion and shrinking are revealed, with the Pt : Ni ratio of ~3 : 2 exhibiting a clear expansion, which coincides with the maximum electrocatalytic activity for the ORR. In comparison with PtNi nanoparticles (NPs), the PtNi NWs display remarkably higher electrocatalytic activity and stability as a result of the composition dependent atomic-scale alloying and faceting, demonstrating a new pathway to the design of alloy nanocatalysts with enhanced activity and durability for fuel cells.

Authors:
; ; ; ; ; ; ; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
OSTI Identifier:
1377898
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 24; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Chang, Fangfang, Yu, Gang, Shan, Shiyao, Skeete, Zakiya, Wu, Jinfang, Luo, Jin, Ren, Yang, Petkov, Valeri, and Zhong, Chuan-Jian. Platinum–nickel nanowire catalysts with composition-tunable alloying and faceting for the oxygen reduction reaction. United States: N. p., 2017. Web. doi:10.1039/c7ta03266h.
Chang, Fangfang, Yu, Gang, Shan, Shiyao, Skeete, Zakiya, Wu, Jinfang, Luo, Jin, Ren, Yang, Petkov, Valeri, & Zhong, Chuan-Jian. Platinum–nickel nanowire catalysts with composition-tunable alloying and faceting for the oxygen reduction reaction. United States. doi:10.1039/c7ta03266h.
Chang, Fangfang, Yu, Gang, Shan, Shiyao, Skeete, Zakiya, Wu, Jinfang, Luo, Jin, Ren, Yang, Petkov, Valeri, and Zhong, Chuan-Jian. Sun . "Platinum–nickel nanowire catalysts with composition-tunable alloying and faceting for the oxygen reduction reaction". United States. doi:10.1039/c7ta03266h.
@article{osti_1377898,
title = {Platinum–nickel nanowire catalysts with composition-tunable alloying and faceting for the oxygen reduction reaction},
author = {Chang, Fangfang and Yu, Gang and Shan, Shiyao and Skeete, Zakiya and Wu, Jinfang and Luo, Jin and Ren, Yang and Petkov, Valeri and Zhong, Chuan-Jian},
abstractNote = {The ability to tune the alloying properties and faceting characteristics of bimetallic nanocatalysts is essential for designing catalysts with enhanced activity and stability through optimizing strain and ligand effects, which is an important frontier for designing advanced materials as catalysts for fuel cell applications. This report describes composition-controlled alloying and faceting of platinum–nickel nanowires (PtNi NWs) for the electrocatalytic oxygen reduction reaction. The PtNi NWs are synthesized by a surfactant-free method and are shown to display bundled morphologies of nano-tetrahedra or nanowires, featuring an ultrathin and irregular helix morphology with composition-tunable facets. Using high-energy synchrotron X-ray diffraction coupled with atomic pair distribution function analysis, lattice expansion and shrinking are revealed, with the Pt : Ni ratio of ~3 : 2 exhibiting a clear expansion, which coincides with the maximum electrocatalytic activity for the ORR. In comparison with PtNi nanoparticles (NPs), the PtNi NWs display remarkably higher electrocatalytic activity and stability as a result of the composition dependent atomic-scale alloying and faceting, demonstrating a new pathway to the design of alloy nanocatalysts with enhanced activity and durability for fuel cells.},
doi = {10.1039/c7ta03266h},
journal = {Journal of Materials Chemistry. A},
issn = {2050-7488},
number = 24,
volume = 5,
place = {United States},
year = {2017},
month = {1}
}

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