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Title: Atomic Layer-by-Layer Deposition of Platinum on Palladium Octahedra for Enhanced Catalysts toward the Oxygen Reduction Reaction

Abstract

We systematically evaluated two different approaches to the syntheses of Pd@PtnL (n = 2–5) core–shell octahedra. We initially prepared the core–shell octahedra using a polyol-based route by titrating a Pt(IV) precursor into the growth solution containing Pd octahedral seeds at 200 °C through the use of a syringe pump. The number of Pt atomic layers could be precisely controlled from two to five by increasing the volume of the precursor solution while fixing the amount of seeds. We then demonstrated the synthesis of Pd@Pt nL octahedra using a water-based route at 95 °C through the one-shot injection of a Pt(II) precursor. Due to the large difference in reaction temperature, the Pd@Pt nL octahedra obtained via the water-based route showed sharper corners than their counterparts obtained through the polyol-based route. When compared to a commercial Pt/C catalyst based upon 3.2 nm Pt particles, the Pd@Pt nL octahedra prepared using both methods showed similar remarkable enhancement in terms of activity (both specific and mass) and durability toward the oxygen reduction reaction. These calculations based upon periodic, self-consistent density functional theory suggested that the enhancement in specific activity for the Pd@Pt nL octahedra could be attributed to the destabilization of OH on theirmore » Pt nL*/Pd(111) surface relative to the {111} and {100} facets exposed on the surface of Pt/C. Finally. the destabilization of OH facilitates its hydrogenation, which was found to be the rate-limiting step of the oxygen reduction reaction on all these surfaces.« less

Authors:
 [1];  [2];  [2];  [3];  [4];  [3];  [2];  [5];  [4];  [3];  [6]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
  2. Georgia Inst. of Technology, Atlanta, GA (United States). Wallace H. Coulter Dept. of Biomedical Engineering
  3. Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemical and Biological Engineering
  4. Univ. of Texas, Dallas, TX (United States). Dept. of Materials Science and Engineering
  5. Department of Materials Science and Engineering, University of Texas at Dallas
  6. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry, Wallace H. Coulter Dept. of Biomedical Engineering
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Org.:
EMSL; CNM at ANL; and NERSC
OSTI Identifier:
1396170
Grant/Contract Number:
FG02-05ER15731; AC02-06CH11357; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; core−shell nanocrystals; density functional theory; octahedra; oxygen reduction reaction; platinum-based electrocatalysts

Citation Formats

Park, Jinho, Zhang, Lei, Choi, Sang-Il, Roling, Luke T., Lu, Ning, Herron, Jeffrey A., Xie, Shuifen, Wang, Jinguo, Kim, Moon J., Mavrikakis, Manos, and Xia, Younan. Atomic Layer-by-Layer Deposition of Platinum on Palladium Octahedra for Enhanced Catalysts toward the Oxygen Reduction Reaction. United States: N. p., 2015. Web. doi:10.1021/nn506387w.
Park, Jinho, Zhang, Lei, Choi, Sang-Il, Roling, Luke T., Lu, Ning, Herron, Jeffrey A., Xie, Shuifen, Wang, Jinguo, Kim, Moon J., Mavrikakis, Manos, & Xia, Younan. Atomic Layer-by-Layer Deposition of Platinum on Palladium Octahedra for Enhanced Catalysts toward the Oxygen Reduction Reaction. United States. doi:10.1021/nn506387w.
Park, Jinho, Zhang, Lei, Choi, Sang-Il, Roling, Luke T., Lu, Ning, Herron, Jeffrey A., Xie, Shuifen, Wang, Jinguo, Kim, Moon J., Mavrikakis, Manos, and Xia, Younan. Sun . "Atomic Layer-by-Layer Deposition of Platinum on Palladium Octahedra for Enhanced Catalysts toward the Oxygen Reduction Reaction". United States. doi:10.1021/nn506387w. https://www.osti.gov/servlets/purl/1396170.
@article{osti_1396170,
title = {Atomic Layer-by-Layer Deposition of Platinum on Palladium Octahedra for Enhanced Catalysts toward the Oxygen Reduction Reaction},
author = {Park, Jinho and Zhang, Lei and Choi, Sang-Il and Roling, Luke T. and Lu, Ning and Herron, Jeffrey A. and Xie, Shuifen and Wang, Jinguo and Kim, Moon J. and Mavrikakis, Manos and Xia, Younan},
abstractNote = {We systematically evaluated two different approaches to the syntheses of Pd@PtnL (n = 2–5) core–shell octahedra. We initially prepared the core–shell octahedra using a polyol-based route by titrating a Pt(IV) precursor into the growth solution containing Pd octahedral seeds at 200 °C through the use of a syringe pump. The number of Pt atomic layers could be precisely controlled from two to five by increasing the volume of the precursor solution while fixing the amount of seeds. We then demonstrated the synthesis of Pd@PtnL octahedra using a water-based route at 95 °C through the one-shot injection of a Pt(II) precursor. Due to the large difference in reaction temperature, the Pd@PtnL octahedra obtained via the water-based route showed sharper corners than their counterparts obtained through the polyol-based route. When compared to a commercial Pt/C catalyst based upon 3.2 nm Pt particles, the Pd@PtnL octahedra prepared using both methods showed similar remarkable enhancement in terms of activity (both specific and mass) and durability toward the oxygen reduction reaction. These calculations based upon periodic, self-consistent density functional theory suggested that the enhancement in specific activity for the Pd@PtnL octahedra could be attributed to the destabilization of OH on their PtnL*/Pd(111) surface relative to the {111} and {100} facets exposed on the surface of Pt/C. Finally. the destabilization of OH facilitates its hydrogenation, which was found to be the rate-limiting step of the oxygen reduction reaction on all these surfaces.},
doi = {10.1021/nn506387w},
journal = {ACS Nano},
number = 3,
volume = 9,
place = {United States},
year = {Sun Feb 08 00:00:00 EST 2015},
month = {Sun Feb 08 00:00:00 EST 2015}
}

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