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Title: The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles

Abstract

Nanosizing can dramatically alter material properties by enhancing surface thermodynamic contributions, shortening diffusion lengths, and increasing the number of catalytically active sites per unit volume. These mechanisms have been used to explain the improved properties of catalysts, battery materials, plasmonic materials, etc. Here we show that Pd nanoparticles also have the ability to self-heal defects in their crystal structures. Using Bragg coherent diffractive imaging, we image dislocations nucleated deep in a Pd nanoparticle during the forward hydriding phase transformation that heal during the reverse transformation, despite the region surrounding the dislocations remaining in the hydrogen-poor phase. We show that defective Pd nanoparticles exhibit sloped isotherms, indicating that defects act as additional barriers to the phase transformation. Our results resolve the formation and healing of structural defects during phase transformations at the single nanoparticle level and offer an additional perspective as to how and why nanoparticles differ from their bulk counterparts.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Stanford Univ., CA (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1411033
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE

Citation Formats

Ulvestad, A., and Yau, A. The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles. United States: N. p., 2017. Web. doi:10.1038/s41467-017-01548-7.
Ulvestad, A., & Yau, A. The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles. United States. doi:10.1038/s41467-017-01548-7.
Ulvestad, A., and Yau, A. Thu . "The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles". United States. doi:10.1038/s41467-017-01548-7. https://www.osti.gov/servlets/purl/1411033.
@article{osti_1411033,
title = {The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles},
author = {Ulvestad, A. and Yau, A.},
abstractNote = {Nanosizing can dramatically alter material properties by enhancing surface thermodynamic contributions, shortening diffusion lengths, and increasing the number of catalytically active sites per unit volume. These mechanisms have been used to explain the improved properties of catalysts, battery materials, plasmonic materials, etc. Here we show that Pd nanoparticles also have the ability to self-heal defects in their crystal structures. Using Bragg coherent diffractive imaging, we image dislocations nucleated deep in a Pd nanoparticle during the forward hydriding phase transformation that heal during the reverse transformation, despite the region surrounding the dislocations remaining in the hydrogen-poor phase. We show that defective Pd nanoparticles exhibit sloped isotherms, indicating that defects act as additional barriers to the phase transformation. Our results resolve the formation and healing of structural defects during phase transformations at the single nanoparticle level and offer an additional perspective as to how and why nanoparticles differ from their bulk counterparts.},
doi = {10.1038/s41467-017-01548-7},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {11}
}

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Cited by: 11 works
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