"Elucidating the surface compositions of Pd@Pt core-shell nanocrystals " by Peng Zhai, Yifeng Shi et al.

Faculty Publications

Title

Elucidating the surface compositions of Pd@Pt core-shell nanocrystals through catalytic reactions and spectroscopy probes

Authors

Peng Zhai, Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA. kunlunding@lsu.edu.
Yifeng Shi, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. younan.xia@bme.gatech.edu.
Qiuxiang Wang, The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, USA.
Younan Xia, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. younan.xia@bme.gatech.edu.
Kunlun Ding, Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA. kunlunding@lsu.edu.

Document Type

Article

Publication Date

11-18-2021

Abstract

The catalytic behaviors or properties of bimetallic catalysts are highly dependent on the surface composition, but it has been a grand challenge to acquire such information. In this work, we employ Pd@Pt core-shell nanocrystals with an octahedral shape and tunable Pt shell thickness as a model system to elucidate their surface compositions using catalytic reactions based upon the selective hydrogenation of butadiene and acetylene. Our results indicate that the surface of the core-shell nanocrystals changed from Pt-rich to Pd-rich when they were subjected to calcination under oxygen, a critical step involved in the preparation of many industrial catalysts. The inside-out migration can be attributed to both atomic interdiffusion and the oxidation of Pd atoms during the calcination process. The changes in surface composition were further confirmed using infrared and X-ray photoelectron spectroscopy. This work offers insightful guidance for the development and optimization of bimetallic catalysts toward various reactions.

Publication Source (Journal or Book title)

Nanoscale

First Page

18498

Last Page

18506

Recommended Citation

Zhai, P., Shi, Y., Wang, Q., Xia, Y., & Ding, K. (2021). Elucidating the surface compositions of Pd@Pt core-shell nanocrystals through catalytic reactions and spectroscopy probes. Nanoscale, 13 (44), 18498-18506. https://doi.org/10.1039/d1nr05636k

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