Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides
Abstract
Exsolution generates stable and catalytically active metal nanoparticles via phase precipitation out of a host oxide. An ability to control the size and dispersion of the exsolution particles is desirable for design of nanostructured (electro)catalysts. In this work, we demonstrate that tuning point defects by lattice strain affects both the thermodynamics and the kinetics of iron (Fe0) exsolution on La0.6Sr0.4FeO3 (LSF) thin film model. By combining in situ surface characterization and ab initio defect modeling, we show oxygen vacancy and Schottky defects to be the primary point defects formed upon Fe0 exsolution. Lattice strain tunes the formation energy, and thus the abundance of these defects, and alters the amount and size of the resulting exsolution particles. In addition, we find that the density of exsolved nanoparticles matches the concentration of oxygen vacancy pairs, thus pointing to the surface oxygen vacancy pairs as preferential nucleation sites for exsolution. The tensile-strained LSF with a facile formation of these critical point defects results in a higher Fe0 metal concentration, a larger density of nanoparticles, and a reduced particle size at its surfaces. These results provide important mechanistic insights and highlight the role of point-defect engineering in designing nanostructured catalysts in energy and fuelmore »
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Technische Univ. Wien, Austria (Austria)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Amsterdam (Netherlands)
- Technische Univ. Wien, Austria (Austria)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sorbonne Univ., Paris (France); Synchrotron SOLEIL, Gif-sur-Yvette (France)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1807942
- Report Number(s):
- BNL-221797-2021-JAAM
Journal ID: ISSN 0897-4756
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemistry of Materials
- Additional Journal Information:
- Journal Volume: 33; Journal Issue: 13; Journal ID: ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; nanoparticles; lattices; metal oxide nanoparticles; defects in solids; defects
Citation Formats
Wang, Jiayue, Yang, Jing, Opitz, Alexander K., Bowman, William, Bliem, Roland, Dimitrakopoulos, Georgios, Nenning, Andreas, Waluyo, Iradwikanari, Hunt, Adrian, Gallet, Jean-Jacques, and Yildiz, Bilge. Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides. United States: N. p., 2021.
Web. doi:10.1021/acs.chemmater.1c00821.
Wang, Jiayue, Yang, Jing, Opitz, Alexander K., Bowman, William, Bliem, Roland, Dimitrakopoulos, Georgios, Nenning, Andreas, Waluyo, Iradwikanari, Hunt, Adrian, Gallet, Jean-Jacques, & Yildiz, Bilge. Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides. United States. https://doi.org/10.1021/acs.chemmater.1c00821
Wang, Jiayue, Yang, Jing, Opitz, Alexander K., Bowman, William, Bliem, Roland, Dimitrakopoulos, Georgios, Nenning, Andreas, Waluyo, Iradwikanari, Hunt, Adrian, Gallet, Jean-Jacques, and Yildiz, Bilge. Tue .
"Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides". United States. https://doi.org/10.1021/acs.chemmater.1c00821. https://www.osti.gov/servlets/purl/1807942.
@article{osti_1807942,
title = {Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides},
author = {Wang, Jiayue and Yang, Jing and Opitz, Alexander K. and Bowman, William and Bliem, Roland and Dimitrakopoulos, Georgios and Nenning, Andreas and Waluyo, Iradwikanari and Hunt, Adrian and Gallet, Jean-Jacques and Yildiz, Bilge},
abstractNote = {Exsolution generates stable and catalytically active metal nanoparticles via phase precipitation out of a host oxide. An ability to control the size and dispersion of the exsolution particles is desirable for design of nanostructured (electro)catalysts. In this work, we demonstrate that tuning point defects by lattice strain affects both the thermodynamics and the kinetics of iron (Fe0) exsolution on La0.6Sr0.4FeO3 (LSF) thin film model. By combining in situ surface characterization and ab initio defect modeling, we show oxygen vacancy and Schottky defects to be the primary point defects formed upon Fe0 exsolution. Lattice strain tunes the formation energy, and thus the abundance of these defects, and alters the amount and size of the resulting exsolution particles. In addition, we find that the density of exsolved nanoparticles matches the concentration of oxygen vacancy pairs, thus pointing to the surface oxygen vacancy pairs as preferential nucleation sites for exsolution. The tensile-strained LSF with a facile formation of these critical point defects results in a higher Fe0 metal concentration, a larger density of nanoparticles, and a reduced particle size at its surfaces. These results provide important mechanistic insights and highlight the role of point-defect engineering in designing nanostructured catalysts in energy and fuel conversion technologies.},
doi = {10.1021/acs.chemmater.1c00821},
journal = {Chemistry of Materials},
number = 13,
volume = 33,
place = {United States},
year = {Tue Jun 15 00:00:00 EDT 2021},
month = {Tue Jun 15 00:00:00 EDT 2021}
}
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