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 PtCl42-) with a coreduction process (for PdCl 42- 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 PtCl42- 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 PtCl42-) with a coreduction process (for PdCl 42- 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 PtCl42- 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 - PROX
KW - Pd nanocubes
KW - Pd-Pt alloy nanocages
KW - coreduction
KW - galvanic replacement
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U2 - 10.1021/nn202896q
DO - 10.1021/nn202896q
M3 - Article
C2 - 21888409
AN - SCOPUS:80055015816
SN - 1936-0851
VL - 5
SP - 8212
EP - 8222
JO - ACS nano
JF - ACS nano
IS - 10
ER -