Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 14, Pages 7675-7680Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202014144
Keywords
core@shell; CuNi@Pt-Cu; MOR activity; nanocatalysts; nano-octahedra
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Funding
- National Science Foundation [DMR 1808383]
- US Department of Energy [DE-SC0019445]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0001135]
- U.S. DOE, Office of Basic Energy Sciences [DE-SC0012704]
- S3IP, State University of New York at Binghamton
- U.S. Department of Energy (DOE) [DE-SC0019445] Funding Source: U.S. Department of Energy (DOE)
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The study successfully prepared octahedral CuNi@Pt-Cu core@shell nanocrystals using a colloidal seed-mediated method, achieving uniform Pt-based shells with a thickness of less than 1 nm by precisely controlling synthesis conditions. The resulting nano-octahedra exhibited superior activity in electrochemical methanol oxidation reaction compared to commercial Pt/C catalysts and nano-polyhedron counterparts of CuNi@Pt-Cu.
Fabrication of 3d metal-based core@shell nanocatalysts with engineered Pt-surfaces provides an effective approach for improving the catalytic performance. The challenges in such preparation include shape control of the 3d metallic cores and thickness control of the Pt-based shells. Herein, we report a colloidal seed-mediated method to prepare octahedral CuNi@Pt-Cu core@shell nanocrystals using CuNi octahedral cores as the template. By precisely controlling the synthesis conditions including the deposition rate and diffusion rate of the shell-formation through tuning the capping ligand, reaction temperature, and heating rate, uniform Pt-based shells can be achieved with a thickness of <1 nm. The resultant carbon-supported CuNi@Pt-Cu core@shell nano-octahedra showed superior activity in electrochemical methanol oxidation reaction (MOR) compared with the commercial Pt/C catalysts and carbon-supported CuNi@Pt-Cu nano-polyhedron counterparts.
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