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DOE OSTI · 1775497

In Situ Strain Evolution on Pt Nanoparticles during Hydrogen Peroxide Decomposition

Choi, Sungwook·Chung, Myungwoo·Kim, Dongjin·Kim, Sungwon·Yun, Kyuseok·Cha, Wonsuk·Harder, Ross·Kawaguchi, Tomoya·Liu, Yihua·Ulvestad, Andrew·You, Hoydoo·Song, Mee Kyung·Kim, Hyunjung
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Abstract

Fundamental understanding of structural changes during catalytic reactions is crucial to understanding the underlying mechanisms and optimizing efficiencies. Surface energy and related catalytic mechanisms are widely studied. However, the catalyst lattice deformation induced by catalytic processes is not well understood. Here, we study the strain in an individual platinum (Pt) nanoparticle (NP) using Bragg coherent diffraction imaging under in situ oxidation and reduction reactions. When Pt NPs are exposed to H 2 O 2 , a typical oxidizer and an intermediate during the oxygen reduction reaction process, alternating overall strain distribution near the surface and inside the NP is observed at the (111) Bragg reflection. In contrast, relatively insignificant changes appear in the (200) reflection. Density functional theory calculations are employed to rationalize the anisotropic lattice strain in terms of induced stress by H 2 O 2 adsorption and decomposition on the Pt NP surface. Our study provides deeper insight into the activity-structure relationship in this system.

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3D imaging77 NANOSCIENCE AND NANOTECHNOLOGYBragg coherent diffraction imagingoxygen reduction reactionplatinum nanoparticlestrain

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Choi, Sungwook, Chung, Myungwoo, Kim, Dongjin, Kim, Sungwon, Yun, Kyuseok, Cha, Wonsuk, Harder, Ross, Kawaguchi, Tomoya, Liu, Yihua, Ulvestad, Andrew, You, Hoydoo, Song, Mee Kyung, Kim, Hyunjung. 2020-11-11. In Situ Strain Evolution on Pt Nanoparticles during Hydrogen Peroxide Decomposition. https://doi.org/10.1021/acs.nanolett.0c03005

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