Enhanced Oxygen Evolution Electrocatalysis In Strained A-Site Cation Deficient Lanio3 Perovskite Thin Films
NANO LETTERS(2020)
摘要
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 d(z)(2) 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 (eta) of compressively strained L0.95NO film is reduced to 130 mV at j = 30 mu A/cm(2) compared with nonstrained LNO (eta = 280 mV), indicating a significant enhancement in OER.
更多查看译文
关键词
d-orbital, Transition metal oxide, Oxygen evolution catalyst, Strain, A-site deficiency
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要