Tuning oxygen vacancies in Bi4Ti3O12 nanosheets to boost piezo-photocatalytic activity
Abstract
Piezo-photocatalysis has emerged as a promising strategy to address environmental pollution and the fast-growing energy shortage. Unfortunately, current efficiencies of piezo-photocatalysts are still far from ideal, and improving their catalytic efficiency remains challenging. In this paper, we introduce oxygen vacancies (OVs) in Bi4Ti3O12 (BIT) nanosheets to boost their piezo-photocatalytic performance. Compared to pristine BIT nanosheets, BIT with an optimized OV concentration exhibit excellent piezo-photocatalytic activity, with an enhancement of 2.2 times the degradation rate constant (k = 0.214 min−1) for Rhodamine B (RhB). The effect of OVs on the adsorption energy and Bader charges was also investigated using density functional theory (DFT) calculations, which shed light on the underlying mechanism that improves the piezo-photocatalytic process in the presence of OVs. Specifically, the introduction of OVs increases the adsorption energy and Bader charges, resulting in an enhancement of charge transfer between O2/H2O and BIT, thus facilitating the catalytic process. This study provides a deeper understanding into the regulation mechanism of OV enhanced piezo-photocatalytic activity and opens new avenues for designing high-performance piezo-photocatalysts. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000595231Publication status
publishedExternal links
Journal / series
Nano EnergyVolume
Pages / Article No.
Publisher
ElsevierSubject
Oxygen vacancies; Piezo-photocatalysis; Bi₄Ti₃O₁₂; DFT; Dye degradationOrganisational unit
03871 - Pérez-Ramírez, Javier / Pérez-Ramírez, Javier
03627 - Nelson, Bradley J. / Nelson, Bradley J.
08705 - Gruppe Pané Vidal
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Funding
192012 - Mechano-chromic, Voltage-sensitive Electrostimulators: Innovative Piezoelectric Biomaterials for Electro-stimulated Cellular growth (SNF)
181988 - Functional 2D porous crystalline materials (2DMats) (SNF)
771565C - Highly Integrated Nanoscale Robots for Targeted Delivery to the Central Nervous System (EC)
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