Facile synthesis of Pd-Pt Alloy nanocages and their enhanced performance for preferential oxidation of co in excess hydrogen

Hui Zhang, Mingshang Jin, Hongyang Liu, Jinguo Wang, Moon J. Kim, Deren Yang, Zhaoxiong Xie, Jingyue Liu, Younan Xia

Research output: Contribution to journalArticle

191 Citations (Scopus)

Abstract

This article describes a new method for the facile synthesis of Pd-Pt alloy nanocages with hollow interiors and porous walls by using Pd nanocubes as sacrificial templates. Differing from our previous work (Zhang, H.; Jin, M. S.; Wang, J. G.; Li, W. Y.; Camargo, P. H. C.; Kim, M. J.; Yang, D. R.; Xie, Z. X.; Xia, Y. Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction. J. Am. Chem. Soc.2011, 133, 6078-6079), we complemented the galvanic replacement (between Pd nanocubes and PtCl4 2-) with a coreduction process (for PdCl 4 2- from the galvanic reaction and PtCl4 2- from the feeding) to generate Pd-Pt alloy nanocages in one step. We found that the rate of galvanic replacement (as determined by the concentrations of Br- and PtCl4 2- and temperature) and the rates of coreduction (as determined by the type of reductant and temperature) played important roles in controlling the morphology of resultant Pd-Pt alloy nanocages. The Pd-Pt nanocages exhibited both enhanced activity and selectivity for the preferential oxidation (PROX) of CO in excess hydrogen than those of Pd nanocubes and the commercial Pt/C thanks to the alloy composition and hollow structure. In addition, as the sizes of the Pd-Pt nanocages decreased, they exhibited higher CO conversion rates and lower maximum conversion temperatures due to the increase in specific surface area.

Original languageEnglish (US)
Pages (from-to)8212-8222
Number of pages11
JournalACS Nano
Volume5
Issue number10
DOIs
StatePublished - Oct 25 2011
Externally publishedYes

Fingerprint

Hydrogen
Oxidation
oxidation
hydrogen
Carbon Monoxide
synthesis
hollow
porous walls
Reducing Agents
Bromides
Specific surface area
Nanocrystals
Temperature
temperature
bromides
nanocrystals
templates
selectivity
Chemical analysis

Keywords

  • coreduction
  • galvanic replacement
  • Pd nanocubes
  • Pd-Pt alloy nanocages
  • PROX

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Facile synthesis of Pd-Pt Alloy nanocages and their enhanced performance for preferential oxidation of co in excess hydrogen. / Zhang, Hui; Jin, Mingshang; Liu, Hongyang; Wang, Jinguo; Kim, Moon J.; Yang, Deren; Xie, Zhaoxiong; Liu, Jingyue; Xia, Younan.

In: ACS Nano, Vol. 5, No. 10, 25.10.2011, p. 8212-8222.

Research output: Contribution to journalArticle

Zhang, Hui ; Jin, Mingshang ; Liu, Hongyang ; Wang, Jinguo ; Kim, Moon J. ; Yang, Deren ; Xie, Zhaoxiong ; Liu, Jingyue ; Xia, Younan. / Facile synthesis of Pd-Pt Alloy nanocages and their enhanced performance for preferential oxidation of co in excess hydrogen. In: ACS Nano. 2011 ; Vol. 5, No. 10. pp. 8212-8222.
@article{a7024e88001d4e30ae1e64853011fa7a,
title = "Facile synthesis of Pd-Pt Alloy nanocages and their enhanced performance for preferential oxidation of co in excess hydrogen",
abstract = "This article describes a new method for the facile synthesis of Pd-Pt alloy nanocages with hollow interiors and porous walls by using Pd nanocubes as sacrificial templates. Differing from our previous work (Zhang, H.; Jin, M. S.; Wang, J. G.; Li, W. Y.; Camargo, P. H. C.; Kim, M. J.; Yang, D. R.; Xie, Z. X.; Xia, Y. Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction. J. Am. Chem. Soc.2011, 133, 6078-6079), we complemented the galvanic replacement (between Pd nanocubes and PtCl4 2-) with a coreduction process (for PdCl 4 2- from the galvanic reaction and PtCl4 2- from the feeding) to generate Pd-Pt alloy nanocages in one step. We found that the rate of galvanic replacement (as determined by the concentrations of Br- and PtCl4 2- and temperature) and the rates of coreduction (as determined by the type of reductant and temperature) played important roles in controlling the morphology of resultant Pd-Pt alloy nanocages. The Pd-Pt nanocages exhibited both enhanced activity and selectivity for the preferential oxidation (PROX) of CO in excess hydrogen than those of Pd nanocubes and the commercial Pt/C thanks to the alloy composition and hollow structure. In addition, as the sizes of the Pd-Pt nanocages decreased, they exhibited higher CO conversion rates and lower maximum conversion temperatures due to the increase in specific surface area.",
keywords = "coreduction, galvanic replacement, Pd nanocubes, Pd-Pt alloy nanocages, PROX",
author = "Hui Zhang and Mingshang Jin and Hongyang Liu and Jinguo Wang and Kim, {Moon J.} and Deren Yang and Zhaoxiong Xie and Jingyue Liu and Younan Xia",
year = "2011",
month = "10",
day = "25",
doi = "10.1021/nn202896q",
language = "English (US)",
volume = "5",
pages = "8212--8222",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "10",

}

TY - JOUR

T1 - Facile synthesis of Pd-Pt Alloy nanocages and their enhanced performance for preferential oxidation of co in excess hydrogen

AU - Zhang, Hui

AU - Jin, Mingshang

AU - Liu, Hongyang

AU - Wang, Jinguo

AU - Kim, Moon J.

AU - Yang, Deren

AU - Xie, Zhaoxiong

AU - Liu, Jingyue

AU - Xia, Younan

PY - 2011/10/25

Y1 - 2011/10/25

N2 - This article describes a new method for the facile synthesis of Pd-Pt alloy nanocages with hollow interiors and porous walls by using Pd nanocubes as sacrificial templates. Differing from our previous work (Zhang, H.; Jin, M. S.; Wang, J. G.; Li, W. Y.; Camargo, P. H. C.; Kim, M. J.; Yang, D. R.; Xie, Z. X.; Xia, Y. Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction. J. Am. Chem. Soc.2011, 133, 6078-6079), we complemented the galvanic replacement (between Pd nanocubes and PtCl4 2-) with a coreduction process (for PdCl 4 2- from the galvanic reaction and PtCl4 2- from the feeding) to generate Pd-Pt alloy nanocages in one step. We found that the rate of galvanic replacement (as determined by the concentrations of Br- and PtCl4 2- and temperature) and the rates of coreduction (as determined by the type of reductant and temperature) played important roles in controlling the morphology of resultant Pd-Pt alloy nanocages. The Pd-Pt nanocages exhibited both enhanced activity and selectivity for the preferential oxidation (PROX) of CO in excess hydrogen than those of Pd nanocubes and the commercial Pt/C thanks to the alloy composition and hollow structure. In addition, as the sizes of the Pd-Pt nanocages decreased, they exhibited higher CO conversion rates and lower maximum conversion temperatures due to the increase in specific surface area.

AB - This article describes a new method for the facile synthesis of Pd-Pt alloy nanocages with hollow interiors and porous walls by using Pd nanocubes as sacrificial templates. Differing from our previous work (Zhang, H.; Jin, M. S.; Wang, J. G.; Li, W. Y.; Camargo, P. H. C.; Kim, M. J.; Yang, D. R.; Xie, Z. X.; Xia, Y. Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction. J. Am. Chem. Soc.2011, 133, 6078-6079), we complemented the galvanic replacement (between Pd nanocubes and PtCl4 2-) with a coreduction process (for PdCl 4 2- from the galvanic reaction and PtCl4 2- from the feeding) to generate Pd-Pt alloy nanocages in one step. We found that the rate of galvanic replacement (as determined by the concentrations of Br- and PtCl4 2- and temperature) and the rates of coreduction (as determined by the type of reductant and temperature) played important roles in controlling the morphology of resultant Pd-Pt alloy nanocages. The Pd-Pt nanocages exhibited both enhanced activity and selectivity for the preferential oxidation (PROX) of CO in excess hydrogen than those of Pd nanocubes and the commercial Pt/C thanks to the alloy composition and hollow structure. In addition, as the sizes of the Pd-Pt nanocages decreased, they exhibited higher CO conversion rates and lower maximum conversion temperatures due to the increase in specific surface area.

KW - coreduction

KW - galvanic replacement

KW - Pd nanocubes

KW - Pd-Pt alloy nanocages

KW - PROX

UR - http://www.scopus.com/inward/record.url?scp=80055015816&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80055015816&partnerID=8YFLogxK

U2 - 10.1021/nn202896q

DO - 10.1021/nn202896q

M3 - Article

VL - 5

SP - 8212

EP - 8222

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

IS - 10

ER -