Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La1.85Sr0.15CuO4 Thin Films
- Univ. of South Carolina, Columbia, SC (United States)
- Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Considerable attention has been directed to understanding the influence of heterointerfaces 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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC05-00OR22725; SC0021363
- OSTI ID:
- 1797906
- Alternate ID(s):
- OSTI ID: 1991685
- Journal Information:
- Applied Sciences, Journal Name: Applied Sciences Journal Issue: 9 Vol. 11; ISSN 2076-3417
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strain control of oxygen kinetics in the Ruddlesden-Popper oxide La1.85Sr0.15CuO4
Journal Article
·
Sun Jan 07 19:00:00 EST 2018
· Nature Communications
·
OSTI ID:1422606
Related Subjects
25 ENERGY STORAGE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABO3 oxides
Ruddlesden–Popper oxides
cathodes
electrical conductivity relaxation
oxide heterostructures
oxide thin films
oxygen reductions reaction
oxygen surface exchange kinetics
solid oxide fuel cells
surface modification
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABO3 oxides
Ruddlesden–Popper oxides
cathodes
electrical conductivity relaxation
oxide heterostructures
oxide thin films
oxygen reductions reaction
oxygen surface exchange kinetics
solid oxide fuel cells
surface modification