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Title: Atomic Layer-by-Layer Deposition of Pt on Pd Nanocubes for Catalysts with Enhanced Activity and Durability toward Oxygen Reduction

Abstract

An effective strategy for reducing the Pt content while retaining the activity of a Pt-based catalyst is to deposit the Pt atoms as ultrathin skins of only a few atomic layers thick on nanoscale substrates made of another metal. During deposition, however, the Pt atoms often take an island growth mode because of a strong bonding between Pt atoms. Here we report a versatile route to the conformal deposition of Pt as uniform, ultrathin shells on Pd nanocubes in a solution phase. The introduction of the Pt precursor at a relatively slow rate and high temperature allowed the deposited Pt atoms to spread across the entire surface of a Pd nanocube to generate a uniform shell. The thickness of the Pt shell could be controlled from one to six atomic layers by varying the amount of Pt precursor added into the system. Compared to a commercial Pt/C catalyst, the Pd@PnL (n = 1-6) core-shell nanocubes showed enhancements in specific activity and durability toward the oxygen reduction reaction (ORR). Density functional theory (DFT) calculations on model (100) surfaces suggest that the enhancement in specific activity can be attributed to the weakening of OH binding through ligand and strain effects, which, inmore » turn, increases the rate of OH hydrogenation. A volcano-type relationship between the ORR specific activity and the number of Pt atomic layers was derived, in good agreement with the experimental results. Both theoretical and experimental studies indicate that the ORR specific activity was maximized for the catalysts based on Pd@Pt2-3L nanocubes. Because of the reduction in Pt content used and the enhancement in specific activity, the Pd@Pt1L nanocubes showed a Pt mass activity with almost three-fold enhancement relative to the Pt/C catalyst.« less

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1222136
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Nano Letters, 14(6):3570-3576
Additional Journal Information:
Journal Name: Nano Letters, 14(6):3570-3576
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Xie, Shuifen, Choi, Sang, Lu, Ning, Roling, Luke T., Herron, Jeffrey A., Zhang, Lei, Park, Jinho, Wang, Jinguo, Kim, Moon J., Xie, Zhaoxiong, Mavrikakis, Manos, and Xia, Younan. Atomic Layer-by-Layer Deposition of Pt on Pd Nanocubes for Catalysts with Enhanced Activity and Durability toward Oxygen Reduction. United States: N. p., 2014. Web. doi:10.1021/nl501205j.
Xie, Shuifen, Choi, Sang, Lu, Ning, Roling, Luke T., Herron, Jeffrey A., Zhang, Lei, Park, Jinho, Wang, Jinguo, Kim, Moon J., Xie, Zhaoxiong, Mavrikakis, Manos, & Xia, Younan. Atomic Layer-by-Layer Deposition of Pt on Pd Nanocubes for Catalysts with Enhanced Activity and Durability toward Oxygen Reduction. United States. https://doi.org/10.1021/nl501205j
Xie, Shuifen, Choi, Sang, Lu, Ning, Roling, Luke T., Herron, Jeffrey A., Zhang, Lei, Park, Jinho, Wang, Jinguo, Kim, Moon J., Xie, Zhaoxiong, Mavrikakis, Manos, and Xia, Younan. 2014. "Atomic Layer-by-Layer Deposition of Pt on Pd Nanocubes for Catalysts with Enhanced Activity and Durability toward Oxygen Reduction". United States. https://doi.org/10.1021/nl501205j.
@article{osti_1222136,
title = {Atomic Layer-by-Layer Deposition of Pt on Pd Nanocubes for Catalysts with Enhanced Activity and Durability toward Oxygen Reduction},
author = {Xie, Shuifen and Choi, Sang and Lu, Ning and Roling, Luke T. and Herron, Jeffrey A. and Zhang, Lei and Park, Jinho and Wang, Jinguo and Kim, Moon J. and Xie, Zhaoxiong and Mavrikakis, Manos and Xia, Younan},
abstractNote = {An effective strategy for reducing the Pt content while retaining the activity of a Pt-based catalyst is to deposit the Pt atoms as ultrathin skins of only a few atomic layers thick on nanoscale substrates made of another metal. During deposition, however, the Pt atoms often take an island growth mode because of a strong bonding between Pt atoms. Here we report a versatile route to the conformal deposition of Pt as uniform, ultrathin shells on Pd nanocubes in a solution phase. The introduction of the Pt precursor at a relatively slow rate and high temperature allowed the deposited Pt atoms to spread across the entire surface of a Pd nanocube to generate a uniform shell. The thickness of the Pt shell could be controlled from one to six atomic layers by varying the amount of Pt precursor added into the system. Compared to a commercial Pt/C catalyst, the Pd@PnL (n = 1-6) core-shell nanocubes showed enhancements in specific activity and durability toward the oxygen reduction reaction (ORR). Density functional theory (DFT) calculations on model (100) surfaces suggest that the enhancement in specific activity can be attributed to the weakening of OH binding through ligand and strain effects, which, in turn, increases the rate of OH hydrogenation. A volcano-type relationship between the ORR specific activity and the number of Pt atomic layers was derived, in good agreement with the experimental results. Both theoretical and experimental studies indicate that the ORR specific activity was maximized for the catalysts based on Pd@Pt2-3L nanocubes. Because of the reduction in Pt content used and the enhancement in specific activity, the Pd@Pt1L nanocubes showed a Pt mass activity with almost three-fold enhancement relative to the Pt/C catalyst.},
doi = {10.1021/nl501205j},
url = {https://www.osti.gov/biblio/1222136}, journal = {Nano Letters, 14(6):3570-3576},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {6}
}

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