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Wang X, Vara M, Luo M, et al. Pd@Pt Core-Shell Concave Decahedra: A Class of Catalysts for the Oxygen Reduction Reaction with Enhanced Activity and Durability. J Am Chem Soc. 2015;137(47):15036-42doi: 10.1021/jacs.5b10059.
Wang, X., Vara, M., Luo, M., Huang, H., Ruditskiy, A., Park, J., Bao, S., Liu, J., Howe, J., Chi, M., Xie, Z., & Xia, Y. (2015). Pd@Pt Core-Shell Concave Decahedra: A Class of Catalysts for the Oxygen Reduction Reaction with Enhanced Activity and Durability. Journal of the American Chemical Society, 137(47), 15036-42. https://doi.org/10.1021/jacs.5b10059
Wang, Xue, et al. "Pd@Pt Core-Shell Concave Decahedra: A Class of Catalysts for the Oxygen Reduction Reaction with Enhanced Activity and Durability." Journal of the American Chemical Society vol. 137,47 (2015): 15036-42. doi: https://doi.org/10.1021/jacs.5b10059
Wang X, Vara M, Luo M, Huang H, Ruditskiy A, Park J, Bao S, Liu J, Howe J, Chi M, Xie Z, Xia Y. Pd@Pt Core-Shell Concave Decahedra: A Class of Catalysts for the Oxygen Reduction Reaction with Enhanced Activity and Durability. J Am Chem Soc. 2015 Dec 02;137(47):15036-42. doi: 10.1021/jacs.5b10059. Epub 2015 Nov 20. PMID: 26566188.
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J Am Chem Soc. 2015 Dec 02;137(47):15036-42. doi: 10.1021/jacs.5b10059. Epub 2015 Nov 20.

Pd@Pt Core-Shell Concave Decahedra: A Class of Catalysts for the Oxygen Reduction Reaction with Enhanced Activity and Durability.

Journal of the American Chemical Society

Xue Wang, Madeline Vara, Ming Luo, Hongwen Huang, Aleksey Ruditskiy, Jinho Park, Shixiong Bao, Jingyue Liu, Jane Howe, Miaofang Chi, Zhaoxiong Xie, Younan Xia

Affiliations

  1. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University , Atlanta, Georgia 30332, United States.
  2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, Xiamen University , Xiamen, Fujian 361005, People's Republic of China.
  3. School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
  4. Department of Physics, Arizona State University , Tempe, Arizona 85287, United States.
  5. Hitachi High-Technologies Canada , Toronto, Ontario M9W?6A4, Canada.
  6. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.

PMID: 26566188 DOI: 10.1021/jacs.5b10059

Abstract

We report a facile synthesis of multiply twinned Pd@Pt core-shell concave decahedra by controlling the deposition of Pt on preformed Pd decahedral seeds. The Pt atoms are initially deposited on the vertices of a decahedral seed, followed by surface diffusion to other regions along the edges/ridges and then across the faces. Different from the coating of a Pd icosahedral seed, the Pt atoms prefer to stay at the vertices and edges/ridges of a decahedral seed even when the deposition is conducted at 200 °C, naturally generating a core-shell structure covered by concave facets. The nonuniformity in the Pt coating can be attributed to the presence of twin boundaries at the vertices, as well as the {100} facets and twin defects along the edges/ridges of a decahedron, effectively trapping the Pt adatoms at these high-energy sites. As compared to a commercial Pt/C catalyst, the Pd@Pt concave decahedra show substantial enhancement in both catalytic activity and durability toward the oxygen reduction reaction (ORR). For the concave decahedra with 29.6% Pt by weight, their specific (1.66 mA/cm(2)Pt) and mass (1.60 A/mgPt) ORR activities are enhanced by 4.4 and 6.6 times relative to those of the Pt/C catalyst (0.36 mA/cm(2)Pt and 0.32 A/mgPt, respectively). After 10,000 cycles of accelerated durability test, the concave decahedra still exhibit a mass activity of 0.69 A/mgPt, more than twice that of the pristine Pt/C catalyst.

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