Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

Abstract

Efficient photo- and piezoelectric-induced molecular oxygen activation are both achieved by macroscopic polarization enhancement on a noncentrosymmetric piezoelectric semiconductor BiOIO . The replacement of V ions for I in IO polyhedra gives rise to strengthened macroscopic polarization of BiOIO , which facilitates the charge separation in the photocatalytic and piezoelectric catalytic process, and renders largely promoted photo- and piezoelectric induced reactive oxygen species (ROS) evolution, such as superoxide radicals ( O ) and hydroxyl radicals ( OH). This work advances piezoelectricity as a new route to efficient ROS generation, and also discloses macroscopic polarization engineering on improvement of multi-responsive catalysis.

Retracted: Self‐floating Cu/N co‐doped TiO2/diatomite granule composite with enhanced visible‐light‐responsive photoactivity and reusability

“…The additional peak at c . 531.6 eV was ascribed to the presence of O from the hydroxyl group . This result suggests that the electron moved between the Ti and the Si atom via the movement of the intermediate O atom, which resulted in the formation of Si‐O‐Ti bonds …”

Macroscopic Spontaneous Polarization and Surface Oxygen Vacancies Collaboratively Boosting CO2 Photoreduction on BiOIO3 Single Crystals

“…The enhanced charge separation promotes photocatalytic degradation of methylene blue . Our group also uncovered that ionic substitution in BiOIO 3 crystal strengthens the distortion of the IO 3 polyhedron, which induces enhanced macroscopic polarization, and consequently promotes bulk charge separation and oxygen activation for producing superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH) …”

Unprecedented Eighteen‐Faceted BiOCl with a Ternary Facet Junction Boosting Cascade Charge Flow and Photo‐redox

“…BiOCl-50, BiOCl-100, and BiOCl-200 samples all exhibited higher H 2 generation activities than BiOCl-10 ( Figure S11), and BiOCl-100 shows the optimal performance among the series samples.T he H 2 production rate of BiOCl-100 (12.49 mmol g À1 h À1 )i sa pproximately 2.1 times that of BiOCl-10 (5.99 mmol g À1 h À1 ;F igure 2a). [23] Thegeneration rate of COH concentration over BiOCl-100 in N 2 was determined to be 11.66 10 À7 mol g À1 h À1 ,w hich reaches 17.67 times higher than that of BiOCl-10 (0.66 10 À7 mol g À1 h À1 ) ( Figure 2b and Figure S12). COH is an important reactive oxygen radical (ROS), which is generally produced via H 2 OorOH À oxidation by photo-induced h + .…”