Enhanced Oxygen Evolution Electrocatalysis in Strained A-Site Cation Deficient LaNiO3 Perovskite Thin Films
- Authors
- Choi, M.-J.; Kim, T.L.; Kim, J.K.; Lee, T.H.; Lee, S.A.; Kim, C.; Hong, K.; Bark, C.W.; Ko, K.-T.; Jang, H.W.
- Issue Date
- Nov-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- A-site deficiency; d-orbital; Oxygen evolution catalyst; Strain; Transition metal oxide
- Citation
- NANO LETTERS, v.20, no.11, pp.8040 - 8045
- Journal Title
- NANO LETTERS
- Volume
- 20
- Number
- 11
- Start Page
- 8040
- End Page
- 8045
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/79226
- DOI
- 10.1021/acs.nanolett.0c02949
- ISSN
- 1530-6984
- Abstract
- As the BO6 octahedral structure in perovskite oxide is strongly linked with electronic behavior, it is actively studied for various fields such as metal-insulator transition, superconductivity, and so on. However, the research about the relationship between water-splitting activity and BO6 structure is largely lacking. Here, we report the oxygen evolution reaction (OER) of LaNiO3 (LNO) by changing the NiO6 structure using compositional change and strain. The 5 atom % La deficiency in LNO resulted in an increase of the Ni-O-Ni bond angle and an expansion of bandwidth, enhancing the charge transfer ability. In-plane compressive strain derives the higher dz2 orbital occupancy, leading to suitable metal-oxygen bond strength for OER. Because of the synergistic effect of A-site deficiency and compressive strain, the overpotential (η) of compressively strained L0.95NO film is reduced to 130 mV at j = 30 μA/cm2 compared with nonstrained LNO (η = 280 mV), indicating a significant enhancement in OER.
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