Strong piezo-electrochemical effect of multiferroic BiFeO3 square micro-sheets for mechanocatalysis

You, Hui; Jia, Yanmin; Wu, Zheng; Xu, Xiaoli; Qian, Weiqi; Xia, Yuntao; Ismail, Muhammad

doi:10.1016/j.elecom.2017.04.017

Cited by 118 publications

(48 citation statements)

References 23 publications

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“…Also, in this case, most of the studies are based on similar systems (azobenzene derivatives), but a larger variability could be obtained by employing different photo-sensible units (for example, spiropyran, stilbene, diarylethene). Further study of alternative stimuli such as variations of chemical composition of the surrounding medium (at the moment current studies are limited to variations of pH or ionic strength), electric and magnetic field (whose employment, in most of the cases, is limited to obtain an easy separation of catalysts after the end of their work [64,65] or to the induction of heating [66] for endothermic reactions) or mechanical stress (also thanks to the exploitation of piezoelectric effect for the generation of catalytically active species [67]) would be desirable, paving the way to the preparation of dynamic systems based on new and unconventional strategies. The preparation of macroscopic catalytic devices has already opened the way in this direction, finding alternative strategies in comparison to the traditional dispersion of heterogeneous catalysts in solution, which also enabled the synergistic combination of precise temporal and spatial control of chemical reactions.…”

Section: Discussionmentioning

confidence: 99%

Switchable Stimuli-Responsive Heterogeneous Catalysis

Vassalini

Alessandri

2018

Catalysts

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Heterogeneous catalytic systems based on the use of stimuli-responsive materials can be switched from an "on" active state to an "off" inactive state, which contributes to endowing the catalysts with unique functional properties, such as adaptability, recyclability and precise spatial and temporal control on different types of chemical reactions. All these properties constitute a step toward the development of nature-inspired catalytic systems. Even if this is a niche area in the field of catalysis, it is possible to find in literature intriguing examples of dynamic catalysts, whose systematic analysis and review are still lacking. The aim of this work is to examine the recent developments of stimuli-responsive heterogeneous catalytic systems from the viewpoint of different approaches that have been proposed to obtain a dynamic control of catalytic efficiency. Because of the variety of reactions and conditions, it is difficult to make a quantitative comparison between the efficiencies of the considered systems, but the analysis of the different strategies can inspire the preparation of new smart catalytic systems.Catalysts 2018, 8, 569 2 of 25 fields [6] and mechanical stress [7], have also been exploited. A large variability can also be observed in the type of system response: variations of chemical properties, solubility, shape, volume, color, aggregation state, electrical properties, magnetic properties, mechanical properties, etc. are all possible. Thanks to this high versatility, artificial smart materials have found application in various sectors [8], ranging from medicine to national security and structural engineering [9]. They are commonly employed for drug delivery [10], self-healing [11], sensing [12], actuations [13], information storage [14], etc. Their use for catalytic purposes has been remarkably less investigated, even if heterogeneous catalysis can fully take advantage of the dynamic behavior of smart materials. For example, it is possible to make a catalyst to pass from a state of activity (an "on" state) to a state of inertness (an "off" state) in a controlled way, with a precise temporal control, obtaining switchable catalysis. In other circumstances, the possibility of modulating the reaction rate in a continuous way, regulating the amount of accessible active sites and accelerating or lowering the reaction rate in a non-discrete way, is more interesting, and in this case we can also exploit stimuli-responsive materials. It is also possible to create microenvironments in which the reaction occurs preferentially, accomplishing a spatial control on the reaction development. In addition, the responsiveness of the employed systems can be exploited to improve the recyclability of the catalytic system, making the catalyst separation from the reaction medium and its reuse easier.In this review, we analyze some of the latest works on dynamic systems in the field of heterogeneous catalysis. Many more examples can be found for homogeneous catalysis, but most of them have been already analyzed in previ...

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Section: Discussionmentioning

confidence: 99%

Switchable Stimuli-Responsive Heterogeneous Catalysis

Vassalini

Alessandri

2018

Catalysts

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“…The diffraction peaks of the pure BiFeO3 accord well with the rhombohedral phase based on the JCPDS Card No. 86-1518 [25]. Because of the low g-C3N4 content, there is no obvious difference of the XRD patterns between BiFeO3/g-C3N4 heterostructures and pure BiFeO3 can be seen in Fig.…”

Section: Pyrocatalytic Dye Decompositionmentioning

confidence: 91%

“…All the raw materials were analytical reagents in this experiment. BiFeO3 was synthesized through a hydrothermal method [25,26]. 2.425 g of Bi(NO3)3•5H2O was dissolved in 50 mL of ethylene glycol.…”

Section: Materials and Methods 21 Synthesis Of Bifeo3mentioning

confidence: 99%

The Enhanced Pyrocatalysis of the Pyroelectric BiFeO3/g-C3N4 Heterostructure for Dye Decomposition Driven by Cold-hot Temperature Alternation

Chen

Yao

et al. 2020

Preprint

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The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of the g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25 %, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25 oC - 65 oC) cycles increases at first and then decreases, reaching a maximum value of ~ 94.2 % at 10% while that of the pure BiFeO 3 is ~ 67.7 %. The enhanced dye decomposition may be due to the fabrication of the heterostructure which strengthens the separation of the positive and negative carriers and further accelerates their migration. The intermediate products in the pyrocatalytic reaction also have been detected and confirmed, which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO3/g-C3N4 heterostructure catalyst. The pyroelectric BiFeO3/g-C3N4 heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.

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“…All the raw materials were analytical reagents in this experiment. BiFeO3 was synthesized through a hydrothermal method [32,33]. 2.425 g of Bi(NO3)3•5H2O was dissolved in 50 mL of ethylene glycol.…”

Section: Materials and Methods 21 Synthesis Of Bifeo3mentioning

confidence: 99%

The enhanced pyrocatalysis of the pyroelectric BiFeO3/g-C3N4 heterostructure for dye decomposition driven by cold-hot temperature alternation

Chen

Yao

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25 %, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25 oC - 65 oC) cycles increases at first and then decreases, reaching a maximum value of ~ 94.2 % at 10 % while that of the pure BiFeO3 is ~ 67.7 %. The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their migrations. The intermediate products in the pyrocatalytic reaction also have been detected and confirmed, which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO3/g-C3N4 heterostructure catalyst. The pyroelectric BiFeO3/g-C3N4 heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.

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Strong piezo-electrochemical effect of multiferroic BiFeO3 square micro-sheets for mechanocatalysis

Cited by 118 publications

References 23 publications

Switchable Stimuli-Responsive Heterogeneous Catalysis

Switchable Stimuli-Responsive Heterogeneous Catalysis

The Enhanced Pyrocatalysis of the Pyroelectric BiFeO3/g-C3N4 Heterostructure for Dye Decomposition Driven by Cold-hot Temperature Alternation

The enhanced pyrocatalysis of the pyroelectric BiFeO3/g-C3N4 heterostructure for dye decomposition driven by cold-hot temperature alternation

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