Robust Flexo‐Catalysis in Centrosymmetric Nanoparticles

Liu, Zhen; Wen, Xinrong; Wang, Yan; Jia, Yanmin; Wang, Feifei; Yuan, Guoliang; Wang, Yaojin

doi:10.1002/admt.202101484

Cited by 14 publications

(9 citation statements)

References 63 publications

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“…Compared with the fresh nanofibers, there is only a very weak absorption peak at around 1250 cm –1 for the used nanofibers, indicating that the absorption effect is very weak. Recently, flexocatalysis has received much attention. , The flexocatalysis effect could happen in the piezocatalysis process, especially for two-dimensional single-crystal piezocatalyst . However, the Bi 5 Ti 3 FeO 15 nanofibers are composed of nanoparticles and when nanofibers are bent under ultrasonic vibration, these nanoparticles in nanofibers are deformed because of compression or tension.…”

Section: Resultsmentioning

confidence: 99%

Bi₅Ti₃FeO₁₅ Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Zhu

et al. 2023

ACS Appl. Nano Mater.

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A piezocatalyst with highly efficient catalytic efficiency toward multiple pollutants’ removal can improve treatment efficiency and reduce the consumption of catalysts, which is ideal for practical applications. Herein, Bi5Ti3FeO15 nanofibers were prepared using electrospinning and its excellent piezocatalytic performances for mixed dyes’ and antibiotics’ degradation were revealed. Rhodamine B (RhB) is degraded by 98% in 20 min, and the acquired reaction rate constant is 0.195 min–1 under ultrasonic vibration. Particularly, the mixed dyes of RhB, acid orange 7, methylene blue, and methyl orange are simultaneously degraded within 40 min, a high rate constant of 0.106 min–1 is achieved, and the degradation efficiencies can be always maintained at ∼100% for five consecutive cycles. The obtained rate constant for mixed dyes’ degradation is superior to many of the previously reported catalysts just toward one dye degradation. Furthermore, it is further demonstrated that tetracycline hydrochloride, bisphenol A, and phenol can be also efficiently degraded by 94, 90, and 79%, respectively, within 30 min. The piezocatalytic performances of nanofibers at different pH values and reaction temperatures were also explored. Catalytic mechanism investigations demonstrate that the optimized Bi5Ti3FeO15 nanofibers possess a weaker carrier recombination rate, smaller carrier transfer resistance, and higher carrier separation efficiency, which account for its superior piezocatalytic performance. This work reveals that Bi5Ti3FeO15 nanofiber is a superior catalyst for organic pollutants’ degradation under mechanical vibration and offers a strategy for the design of other high-performance piezocatalysts.

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Section: Resultsmentioning

confidence: 99%

Bi₅Ti₃FeO₁₅ Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Zhu

et al. 2023

ACS Appl. Nano Mater.

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“…On the other hand, the flexoelectric effect occurs when a strain gradient breaks the inversion symmetry, generating electric polarization in a preferred direction of dielectric materials. 37 Unlike the piezoelectric effect, the flexoelectric effect is not restricted to noncentrosymmetric crystal structures. Although flexoelectricity is typically weak in bulk materials due to low flexoelectric coefficients, it may become significant in nanosized ML materials due to the substantial strain gradients.…”

Section: ••mentioning

confidence: 99%

Mechanoluminescent Light Sources Based on Nanostructured Systems for Biomedical Applications: A Review

Yang,

Ge,

Zheng

et al. 2024

ACS Appl. Nano Mater.

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Mechanoluminescent materials refer to substances that emit light in response to mechanical stimuli. While these materials exhibit unique properties ideal for stress-based wearable device, structure diagnosis, and anticounterfeiting applications, their utilization in the biomedical field has been relatively underexplored. This comprehensive review aims to provide an extensive overview of the latest advancements in mechanoluminescent light sources, including trap-controlled mechanoluminescence and chemiluminescence/bioluminescence-based mechanoluminescence. We delve into their working principles, synthesis methods, and intricate details of their biomedical applications. Additionally, we highlight existing challenges in mechanoluminescent materials, such as synthesis strategy, mechanism elucidation, and functionalization, subsequently proposing potential solutions essential for advancing their biomedical applications.

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“…(1) 压-电-化学耦合的物理机制尚有待完善：压-电-化学耦合是将力信号 (机械信号)转化为电信号并进一步参与化学反应。然而其中间的力-电转换过程除了源自催化剂材料的压电效应，在理论上也有可能源自催化剂的挠曲电效应或摩擦生电效应 [75,76] 。对于压电化学耦合实验现象的解释目前包括压电催化、挠曲电催化和摩擦催化，未来需要对其具体的起源进行深入的研究和系统的甄别。此外，目前尚未对压电化学耦合的中间过程，如载流子的产生与迁移过程需要进行详细的理论与实验研究。在光-电-化学耦合过程，李灿等人采用表面光电压谱直接观测到载流子的产生和迁移 [77] ，未来如何采用类似的方法对压-电-化…”

Section: 展望unclassified

Research progress in enhancement strategies and mechanisms of piezo-electro-chemical coupling

Yao¹,

Wang²,

Zhang³

et al. 2023

Acta Phys. Sin.

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Piezoelectric materials can harvest tiny mechanical energy existing in the environment, and have a strong ability to convert mechanical signals into electrical signals. Piezo-electro-chemical coupling can be realized via coupling piezoelectric effect of piezoelectric materials and electrochemical redox effect. In recent years, piezo-electro-chemical coupling has attracted a lot of attention from researchers in harvesting vibration energy to treat dye wastewater. The piezoelectric catalyst material dispersed in solution is deformed by ultrasonic vibrations with applied stress. Based on the piezoelectric and spontaneous polarization effects, positive and negative charges are generated at both ends of the catalyst, which can further react with dissolved oxygen and hydroxide ions in the solution to generate superoxide and hydroxyl radicals (·O<sub>2</sub>-and ·OH) for decomposing organic dyes. However, ordinary piezoelectric catalytic materials are often difficult to meet people's pursuit of efficient treatment of organic dyes. Researchers have conducted a lot of research on piezo-electro-chemical coupling, mainly focusing on the following two aspects: 1) the modification of piezoelectric catalysts to achieve extended carrier lifetime, accelerated carrier separation and high piezoelectric coefficients. 2) The combination of piezo-electro-chemical coupling with photocatalysis to suppress photogenerated carrier compounding to obtain high synergistic catalytic performance. In this work, the following five strategies to enhance the piezo-electro-chemical coupling via modifying piezoelectric catalyst materials are introduced. The heterojunction structure is constructed to promote the separation of electron-hole pairs. The precious metal is coated on the surface of the catalyst to accelerate the transport and transfer of electrons. The catalyst composition is regulated and controlled to obtain an increased piezoelectric coefficient at the phase boundary. Carbon or graphene are mixed in the catalyst to accelerate the electron transfer on the surface of piezoelectric materials. The number of active sites is increased through introducing defects in the catalyst to increase the concentration of carriers. The physical mechanisms of five different strategies are described from the perspectives of electrons transport and transfer, phase transition and oxygen vacancies. In addition, prospects for piezoelectric chemical coupling in energy and biomedical applications such as hydrogen production, carbon dioxide reduction, tumor therapy and tooth whitening are presented.

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Robust Flexo‐Catalysis in Centrosymmetric Nanoparticles

Cited by 14 publications

References 63 publications

Bi₅Ti₃FeO₁₅ Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Bi₅Ti₃FeO₁₅ Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Mechanoluminescent Light Sources Based on Nanostructured Systems for Biomedical Applications: A Review

Research progress in enhancement strategies and mechanisms of piezo-electro-chemical coupling

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Robust Flexo‐Catalysis in Centrosymmetric Nanoparticles

Cited by 14 publications

References 63 publications

Bi5Ti3FeO15 Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Bi5Ti3FeO15 Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Mechanoluminescent Light Sources Based on Nanostructured Systems for Biomedical Applications: A Review

Research progress in enhancement strategies and mechanisms of piezo-electro-chemical coupling

Contact Info

Product

Resources

About

Bi₅Ti₃FeO₁₅ Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics

Bi₅Ti₃FeO₁₅ Nanofibers for Highly Efficient Piezocatalytic Degradation of Mixed Dyes and Antibiotics