Influence of heterointerfaces on the kinetics of oxygen surface exchange on epitaxial La1.85Sr0.15CuO4 thin films

Gene Yang; So Yeun Kim; Changhee Sohn; Jong K. Keum; Dongkyu Lee

doi:10.3390/app11093778

Influence of heterointerfaces on the kinetics of oxygen surface exchange on epitaxial La_1.85Sr_0.15CuO₄ thin films

Gene Yang, So Yeun Kim, Changhee Sohn, Jong K. Keum, Dongkyu Lee

Functional Hybrid Nanomaterials

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Considerable attention has been directed to understanding the influence of heterointer-faces between Ruddlesden–Popper (RP) phases and ABO₃ perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO₃ (LNO) on La_1.85Sr_0.15CuO₄ (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (k_chem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the k_chem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.

Original language	English
Article number	3778
Journal	Applied Sciences (Switzerland)
Volume	11
Issue number	9
DOIs	https://doi.org/10.3390/app11093778
State	Published - May 1 2021

Funding

Funding: This research was funded by the U.S. Department of Energy (DOE), Office of Science (OS), Basic Energy Sciences (BES), grant number DE-SC0021363. Support for C.S. was provided by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF-2017M3D1A1040828).

Keywords

ABO oxides
Cathodes
Electrical conductivity relaxation
Oxide heterostructures
Oxide thin films
Oxygen reductions reaction
Oxygen surface exchange kinetics
Ruddlesden–Popper oxides
Solid oxide fuel cells
Surface modification

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Access to Document

10.3390/app11093778

Cite this

@article{306e8982361f4b52ae522975a317564e,

title = "Influence of heterointerfaces on the kinetics of oxygen surface exchange on epitaxial La1.85Sr0.15CuO4 thin films",

abstract = "Considerable attention has been directed to understanding the influence of heterointer-faces between Ruddlesden–Popper (RP) phases and ABO3 perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO3 (LNO) on La1.85Sr0.15CuO4 (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (kchem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the kchem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.",

keywords = "ABO oxides, Cathodes, Electrical conductivity relaxation, Oxide heterostructures, Oxide thin films, Oxygen reductions reaction, Oxygen surface exchange kinetics, Ruddlesden–Popper oxides, Solid oxide fuel cells, Surface modification",

author = "Gene Yang and Kim, {So Yeun} and Changhee Sohn and Keum, {Jong K.} and Dongkyu Lee",

note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

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T1 - Influence of heterointerfaces on the kinetics of oxygen surface exchange on epitaxial La1.85Sr0.15CuO4 thin films

AU - Yang, Gene

AU - Kim, So Yeun

AU - Sohn, Changhee

AU - Keum, Jong K.

AU - Lee, Dongkyu

PY - 2021/5/1

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N2 - Considerable attention has been directed to understanding the influence of heterointer-faces between Ruddlesden–Popper (RP) phases and ABO3 perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO3 (LNO) on La1.85Sr0.15CuO4 (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (kchem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the kchem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.

AB - Considerable attention has been directed to understanding the influence of heterointer-faces between Ruddlesden–Popper (RP) phases and ABO3 perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO3 (LNO) on La1.85Sr0.15CuO4 (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (kchem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the kchem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.

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KW - Ruddlesden–Popper oxides

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KW - Surface modification

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