Deconvolution of octahedral Pt3Ni nanoparticle growth pathway from in situ characterizations

Xiaochen Shen, Changlin Zhang, Shuyi Zhang, Sheng Dai, Guanghui Zhang, Mingyuan Ge, Yanbo Pan, Stephen M. Sharkey, George W. Graham, Adrian Hunt, Iradwikanari Waluyo (), Jeffrey T. Miller (), Xiaoqing Pan () and Zhenmeng Peng ()
Additional contact information
Xiaochen Shen: The University of Akron
Changlin Zhang: The University of Akron
Shuyi Zhang: University of Michigan
Sheng Dai: University of Michigan
Guanghui Zhang: Purdue University
Mingyuan Ge: Brookhaven National Laboratory
Yanbo Pan: The University of Akron
Stephen M. Sharkey: The University of Akron
George W. Graham: University of Michigan
Adrian Hunt: Brookhaven National Laboratory
Iradwikanari Waluyo: Brookhaven National Laboratory
Jeffrey T. Miller: Purdue University
Xiaoqing Pan: University of California-Irvine
Zhenmeng Peng: The University of Akron

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Understanding the growth pathway of faceted alloy nanoparticles at the atomic level is crucial to morphology control and property tuning. Yet, it remains a challenge due to complexity of the growth process and technical limits of modern characterization tools. We report a combinational use of multiple cutting-edge in situ techniques to study the growth process of octahedral Pt3Ni nanoparticles, which reveal the particle growth and facet formation mechanisms. Our studies confirm the formation of octahedral Pt3Ni initiates from Pt nuclei generation, which is followed by continuous Pt reduction that simultaneously catalyzes Ni reduction, resulting in mixed alloy formation with moderate elemental segregation. Carbon monoxide molecules serve as a facet formation modulator and induce Ni segregation to the surface, which inhibits the (111) facet growth and causes the particle shape to evolve from a spherical cluster to an octahedron as the (001) facet continues to grow.

Date: 2018
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DOI: 10.1038/s41467-018-06900-z

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