Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces

Cheng, Yuan; Raman, Abhinav S.; Paige, Julian; Zhang, Liang; Sun, Danyi; Chen, Mavis U.; Vojvodic, Aleksandra; Gorte, Raymond J.; Vohs, John M.

doi:10.1021/acs.jpclett.9b01235

Title: Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces

Journal Article · 03 July 2019 · Journal of Physical Chemistry Letters

DOI: https://doi.org/10.1021/acs.jpclett.9b01235 · OSTI ID:1594019

Cheng, Yuan ^[1]; Raman, Abhinav S. ^[2]; Paige, Julian ^[2]; Zhang, Liang ^[2]; Sun, Danyi ^[2]; Chen, Mavis U. ^[2];

^[2]; Gorte, Raymond J. ^[2];

^[2]

Univ. of Pennsylvania, Philadelphia, PA (United States); University of Pennsylvania
Univ. of Pennsylvania, Philadelphia, PA (United States)

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.

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Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0031252

OSTI ID:: 1594019

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 14 Vol. 10; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
oxygen reduction reaction
electrocatalysis
cathode
solid oxide fuel cells

Title: Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces

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