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Defect Engineering Centrosymmetric 2D Material Flexocatalysts
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DOI：10.1002/smll.202401116.png)
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In this study, the flexoelectric characteristics of 2D TiO2 nanosheets are examined. The theoretical calculations and experimental results reveal an excellent strain-induced flexoelectric potential (flexopotential) by an effective defect engineering strategy, which suppresses the recombination of electron-hole pairs, thus substantially improving the catalytic activity of the TiO2 nanosheets in the degradation of Rhodamine B dye and the hydrogen evolution reaction in a dark environment. The results indicate that strain-induced bandgap reduction enhances the catalytic activity of the TiO2 nanosheets. In addition, the TiO2 nanosheets degraded Rhodamine B, with kobs being approximate to 1.5 x 10-2 min-1 in dark, while TiO2 nanoparticles show only an adsorption effect. 2D TiO2 nanosheets achieve a hydrogen production rate of 137.9 mu mol g-1 h-1 under a dark environment, 197% higher than those of TiO2 nanoparticles (70.1 mu mol g-1 h-1). The flexopotential of the TiO2 nanosheets is enhanced by increasing the bending moment, with excellent flexopotential along the y-axis. Density functional theory is used to identify the stress-induced bandgap reduction and oxygen vacancy formation, which results in the self-dissociation of H2O on the surface of the TiO in the dark. The present findings provide novel insights into the role of TiO2 flexocatalysis in electrochemical reactions. An excellent strain-induced flexoelectric potential by an effective defect engineering strategy suppresses the recombination of electron-hole pairs, thus substantially improving the catalytic activity of the 2D TiO2 nanosheets in a dark environment. image
Keyword:
2D materials
centrosymmetric
defect Engineering
flexocatalysts
期刊
IF:
12.1
论文数:
3.0W
被引数:
16.4W
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