Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces
Abstract
A detailed understanding of the effects of surface chemical and geometric composition is essential for understanding the electrochemical performance of the perovskite (ABO3) oxides commonly used as electrocatalysts in the cathodes of ceramic fuel cells. In this work, we report how the addition of submonolayer quantities of A- and B-site cations affect the rate of the Oxygen Reduction Reaction (ORR) of Sr-doped LaFeO3 (LSF), LaMnO3 (LSM), and LaCoO3 (LSCo). Density functional theory (DFT) calculations were performed to determine the stability of different active sites on a collection of surfaces. With LSF and LSM, rates for ORR are significantly higher on the A-site terminated surface, while surface termination is less important for LSCo. Our findings highlight the importance of tailoring the surface termination of the perovskite to obtain its ultimate ORR performance.
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Publication Date:
- Research Org.:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1594019
- Grant/Contract Number:
- FE0031252
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry Letters
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 14; Journal ID: ISSN 1948-7185
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; oxygen reduction reaction; electrocatalysis; cathode; solid oxide fuel cells
Citation Formats
Cheng, Yuan, Raman, Abhinav S., Paige, Julian, Zhang, Liang, Sun, Danyi, Chen, Mavis U., Vojvodic, Aleksandra, Gorte, Raymond J., and Vohs, John M. Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces. United States: N. p., 2019.
Web. doi:10.1021/acs.jpclett.9b01235.
Cheng, Yuan, Raman, Abhinav S., Paige, Julian, Zhang, Liang, Sun, Danyi, Chen, Mavis U., Vojvodic, Aleksandra, Gorte, Raymond J., & Vohs, John M. Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces. United States. https://doi.org/10.1021/acs.jpclett.9b01235
Cheng, Yuan, Raman, Abhinav S., Paige, Julian, Zhang, Liang, Sun, Danyi, Chen, Mavis U., Vojvodic, Aleksandra, Gorte, Raymond J., and Vohs, John M. Thu .
"Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces". United States. https://doi.org/10.1021/acs.jpclett.9b01235. https://www.osti.gov/servlets/purl/1594019.
@article{osti_1594019,
title = {Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces},
author = {Cheng, Yuan and Raman, Abhinav S. and Paige, Julian and Zhang, Liang and Sun, Danyi and Chen, Mavis U. and Vojvodic, Aleksandra and Gorte, Raymond J. and Vohs, John M.},
abstractNote = {A detailed understanding of the effects of surface chemical and geometric composition is essential for understanding the electrochemical performance of the perovskite (ABO3) oxides commonly used as electrocatalysts in the cathodes of ceramic fuel cells. In this work, we report how the addition of submonolayer quantities of A- and B-site cations affect the rate of the Oxygen Reduction Reaction (ORR) of Sr-doped LaFeO3 (LSF), LaMnO3 (LSM), and LaCoO3 (LSCo). Density functional theory (DFT) calculations were performed to determine the stability of different active sites on a collection of surfaces. With LSF and LSM, rates for ORR are significantly higher on the A-site terminated surface, while surface termination is less important for LSCo. Our findings highlight the importance of tailoring the surface termination of the perovskite to obtain its ultimate ORR performance.},
doi = {10.1021/acs.jpclett.9b01235},
journal = {Journal of Physical Chemistry Letters},
number = 14,
volume = 10,
place = {United States},
year = {Thu Jul 04 00:00:00 EDT 2019},
month = {Thu Jul 04 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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