X射线吸收光谱法
钙钛矿(结构)
密度泛函理论
晶界
材料科学
催化作用
电子转移
吸收光谱法
化学
物理化学
结晶学
计算化学
冶金
物理
微观结构
量子力学
生物化学
作者
Juan Wang,Chen Cheng,Xiaoqing Huang,Jianlei Cao,Leigang Li,Qi Shao,Liang Zhang,Xiaoqing Huang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2021-01-15
卷期号:21 (2): 980-987
被引量:71
标识
DOI:10.1021/acs.nanolett.0c04004
摘要
Electroreduction of carbon dioxide (CO2RR) has been regarded as a promising approach to realize the production of useful fuels and to decrease greenhouse gas levels simultaneously, where high-efficiency catalysts are required. Herein, we report La2CuO4 nanobamboo (La2CuO4 NBs) perovskite with rich twin boundaries showing a high Faraday efficiency (FE) of 60% toward ethylene (C2H4), whereas bulk La2CuO4 exhibits a FECO of 91%. X-ray absorption spectroscopy (XAS) reveals that the Cu in La2CuO4 NBs is in the Cu2+ state, and no obvious change can be observed during the catalytic process, as monitored by in situ XAS. Density functional theory calculations reveal that the superior FEC2H4 of La2CuO4 NBs originates from the active (113) surfaces with intrinsic strain. The formation of gap states annihilates the electron transfer barrier of C–C coupling, resulting in the high FEC2H4. This work provides a new perspective for developing efficient perovskite catalysts via grain boundary engineering.
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