Qi Ji, Zhang Yuan, Liu Huan, Xu Hang, Wang Chen, Hu Linglong, Feng Ming, Lü Weiming
Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China.
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China.
Nano Lett. 2022 Sep 14;22(17):7066-7072. doi: 10.1021/acs.nanolett.2c01966. Epub 2022 Aug 17.
In perovskite complex oxides, the strain has been established as a promising approach for tuning the oxygen evolution reaction (OER) performance by the manipulated electronic structure and interaction/coupling. In this study, we have employed rigid epitaxial, flexible freestanding, and van der Waals LaSrMnO (LSMO) to investigate the strain effects on OER, which are different in stress strength and range via lattice mismatch and curvature change. It was found that the OER performances as a function of strain exhibited volcano and monotonous trends in rigid and flexible LSMO, respectively. The findings suggest that distinguished oxygen activation energy in varied lattice fields also plays a crucial role in the epitaxial LSMO in contrast to the pure strain effect in the flexible LSMO. Our results not only fundamentally clarify the effort of strain but also technologically provide an effective route to engineer the electronic structure for modified OER performance by perovskite complex oxides.
在钙钛矿复合氧化物中，应变已被确立为一种有前景的方法，可通过操纵电子结构和相互作用/耦合来调节析氧反应（OER）性能。在本研究中，我们采用了刚性外延、柔性独立和范德华LaSrMnO（LSMO）来研究应变对OER的影响，这些应变通过晶格失配和曲率变化在应力强度和范围上有所不同。研究发现，作为应变函数的OER性能在刚性和柔性LSMO中分别呈现出火山形和单调趋势。研究结果表明，与柔性LSMO中的纯应变效应相比，不同晶格场中独特的氧活化能在外延LSMO中也起着关键作用。我们的结果不仅从根本上阐明了应变的作用，而且在技术上为通过钙钛矿复合氧化物设计用于改善OER性能的电子结构提供了一条有效途径。
