Grain-Boundary-Engineered La<sub>2</sub>CuO<sub>4</sub> Perovskite Nanobamboos for Efficient CO<sub>2</sub> Reduction Reaction.
basic_science · Level V
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- Record sourced from PubMed, PMID 33448862.
- Also identified by DOI 10.1021/acs.nanolett.0c04004.
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Abstract
Electroreduction of carbon dioxide (CO<sub>2</sub>RR) 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 La<sub>2</sub>CuO<sub>4</sub> nanobamboo (La<sub>2</sub>CuO<sub>4</sub> NBs) perovskite with rich twin boundaries showing a high Faraday efficiency (FE) of 60% toward ethylene (C<sub>2</sub>H<sub>4</sub>), whereas bulk La<sub>2</sub>CuO<sub>4</sub> exhibits a FE<sub>CO</sub> of 91%. X-ray absorption spectroscopy (XAS) reveals that the Cu in La<sub>2</sub>CuO<sub>4</sub> NBs is in the Cu<sup>2+</sup> state, and no obvious change can be observed during the catalytic process, as monitored by <i>in situ</i> XAS. Density functional theory calculations reveal that the superior FE<sub>C<sub>2</sub>H<sub>4</sub></sub> of La<sub>2</sub>CuO<sub>4</sub> 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 FE<sub>C<sub>2</sub>H<sub>4</sub></sub>. This work provides a new perspective for developing efficient perovskite catalysts <i>via</i> grain boundary engineering.