Flexo-photocatalysis in centrosymmetric semiconductors

Boosting Efficiency in Piezo-Photocatalysis Process Using Poled Ba0.7Sr0.3TiO3 Nanorod Arrays for Pollutant Degradation and Hydrogen Production

“…Figure h shows that the reaction rate constants k for the degradation of RhB molecules were 3.6, 7.5, and 14.5 min –1 using TiO 2 NRs under ultrasonic vibration only, light irradiation only, and both ultrasonic vibration and light irradiation conditions. The reaction rate constants under ultrasonic vibration conditions are higher than the catalysis-free conditions, which may be attributed to the flexoelectricity-enhanced catalysis process. , …”

Photocatalytic Conversion of Carbon Dioxide and Nitrogen Dioxide: Current Developments, Challenges, and Perspectives

“…The other option is to design new hybrid systems of photovoltaic and photocatalytic devices, allowing solar energy to be successfully utilized for more extended periods of time, and perhaps combine emergent technologies such as external stimuli technologies, such as magnetic, , mechanical, − or thermal. , In the future, hybrid photoreactor architecture appears to be a promising solution for the year-round production of solar fuel and offers much more consideration, with tremendous potential impact on society and space exploration. , Consequently, by combining solar cells with a photoreactor system, it is possible to carry out efficient and affordable heterogeneous photocatalytic processes.…”

Coupling Enhanced Piezo-Photocatalysis on Robust Intergrowth Ferroelectric SrBi8Ti7O27 Nanosheets

“…This advantage stems from the generation of a built-in electric field through the piezoelectric effect, which plays a crucial role in promoting the separation and subsequent utilization of carriers. − For noncentrosymmetric crystal structures, the piezoelectric polarization electric field can be created by mechanical stress. Moreover, it has been reported that local built-in electric fields can be formed through strain-gradient-induced flexoelectric polarization or exposing local dipoles in nonpiezoelectric materials with centrosymmetric systems, such as g-C 3 N 4 , BiVO 4 , δ-MnO 2 , TiO 2 , and Bi 2 Fe 4 O 9 . − Meanwhile, the built-in electric field induced by mechanical force strongly depends on the change of defects, morphology, size, and structure of the materials . Various strategies have been devised to promote the charge separation and interfacial charge transfer in these hybrid platforms, such as morphology control, polarization regulation, surface engineering, and heterostructure. − Among them, the direct enhancement of internal polarization in piezoelectric materials is crucial to improve the piezoelectric potential output because the efficiency of piezo-photocatalysis is positively related to the piezoelectricity of the semiconductor .…”