Enhanced Oxygen Evolution Electrocatalysis in Strained A-Site Cation Deficient LaNiO<sub>3</sub> Perovskite Thin Films.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33135899.
- Also identified by DOI 10.1021/acs.nanolett.0c02949.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
As the BO<sub>6</sub> 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 BO<sub>6</sub> structure is largely lacking. Here, we report the oxygen evolution reaction (OER) of LaNiO<sub>3</sub> (LNO) by changing the NiO<sub>6</sub> 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 d<sub><i>z</i><sup>2</sup></sub> 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 L<sub>0.95</sub>NO film is reduced to 130 mV at <i>j</i> = 30 μA/cm<sup>2</sup> compared with nonstrained LNO (η = 280 mV), indicating a significant enhancement in OER.