Nano‐Ferroelectric for High Efficiency Overall Water Splitting under Ultrasonic Vibration

Su, Ran; Hsain, H. Alex; Wu, Ming; Zhang, Dawei; Hu, Xinghao; Wang, Zhipeng; Wang, Xiaojing; Li, F.; Chen, Xuemin; Zhu, Lina; Yang, Yong; Yang, Yaodong; Lou, Xiaojie; Pennycook, Stephen J.

doi:10.1002/anie.201907695

Cited by 194 publications

(129 citation statements)

References 48 publications

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“…g,h) H 2 evolution performance comparison of UT‐g‐C 3 N 4 with the reported piezocatalysts (g) and g‐C 3 N 4 ‐based photocatalysts (h). [ 14,16,17,29–49 ]…”

Section: Resultsmentioning

confidence: 99%

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

et al. 2021

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Utilizing mechanical energy to produce hydrogen is emerging as a promising way to generate renewable energy, but is challenged by low efficiency and scanty cognition. In this work, graphitic carbon nitride (g‐C3N4) with an atomically thin sheet‐like structure is applied for prominent piezocatalytic and photo‐enhanced piezocatalytic H2 production. It is revealed that the anomalous piezoelectricity in g‐C3N4 originates from the strong in‐plane polarization along the a‐axis, contributed by the superimposed polar tri‐s‐triazine units and flexoelectric effect derived from the structured triangular cavities, which provides powerful electrochemical driving force for the water reduction reaction. Furthermore, the photo‐enhanced charge transfer enables g‐C3N4 nanosheets to reserve more energized polarization charges to fully participate in the reaction at the surface reactive sites enriched by strain‐induced carbon vacancies. Without any cocatalysts, an exceptional photo‐piezocatalytic H2 evolution rate of 12.16 mmol g−1 h−1 is delivered by the g‐C3N4 nanosheets, far exceeding that of previously reported piezocatalysts and g‐C3N4 photocatalysts. Further, high pure‐water‐splitting performance with production of the value‐added oxidation product H2O2 via photo‐piezocatalysis is also disclosed. This work not only exposes the potential of g‐C3N4 as a piezo‐semiconductor for catalytic H2 evolution, but also breaks a new ground for the conversion of solar and mechanical energy by photomediated piezocatalytic reaction.

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“…g,h) H 2 evolution performance comparison of UT‐g‐C 3 N 4 with the reported piezocatalysts (g) and g‐C 3 N 4 ‐based photocatalysts (h). [ 14,16,17,29–49 ]…”

Section: Resultsmentioning

confidence: 99%

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

et al. 2021

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“…The lower curvature of landau free energy suggests that formation of MPB decreased the energy barrier, leading to an appreciable piezoelectricity (Figure 11e,f). [ 116 ] As a result, an overall water splitting performance with high production rates of H 2 (655 µmol g −1 h −1 ) and O 2 (316 µmol g −1 h −1 ) was obtained.…”

Section: Piezocatalysismentioning

confidence: 99%

mentioning

confidence: 99%

Piezocatalysis and Piezo‐Photocatalysis: Catalysts Classification and Modification Strategy, Reaction Mechanism, and Practical Application

Guo

Zhang

et al. 2020

Adv Funct Materials

491

320

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Piezoelectric-based catalysis that relies on the charge energy or separation efficiency of charge carriers has attracted significant attention. The piezo-potential induced by strain or stress can induce a giant electric field, which has been demonstrated to be an effective means for charge energy shifting or transferring electrons and holes. In recent years, intense efforts have been made in this subject, and the research has mainly focussed on two aspects: i) Alteration of surface charge energy by piezo-potential in piezocatalysis; ii) the separation of photo-generated charge carriers and the catalytic activity enhancement of an integrated piezoelectric semiconductor or coupled system composed of piezoelectrics and semiconductors. Systematically summarizing the advances of the above two aspects is helpful in the context of deepening understanding of the relevant issues and developing new ideas for piezoelectric-based catalysis. In this review, a comprehensive summary on piezocatalysis and piezo-photocatalysis is provided. The charge transfer behaviors and catalytic mechanisms over a large variety of piezocatalysts and piezo-photocatalysts are systematically analyzed. In addition, the types of mechanical energy, strategies for enhancing piezocatalysis, and the advanced applications of piezocatalysis and piezophotocatalysis are discussed. Finally, the promising development directions of piezocatalysis and piezo-photocatalysis, such as materials, assembly forms, and applications in the future are proposed.

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“…In recent years, there has been a growing interest in utilizing mechanical energy as a clean energy for more applications. For instance, piezoelectric nanomaterials, especially those of one-and two-dimensions, undergo considerable deformation under vibrations with piezopotentials generated across them [1], which subsequently induce such redox reactions as degradation of organic pollutants [2][3][4][5][6] and hydrogen production [7][8][9]. A technology known as piezocatalysis has thus emerged, which aims to harvest mechanical energy in ambient environments through piezoelectric nanomaterials for chemical reactions and has been extensively investigated [10,11].…”

Section: Introductionmentioning

confidence: 99%

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Tang

Xiao

et al. 2021

Friction

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The friction between nanomaterials and Teflon magnetic stirring rods has recently drawn much attention for its role in dye degradation by magnetic stirring in dark. Presently the friction between TiO2 nanoparticles and magnetic stirring rods in water has been deliberately enhanced and explored. As much as 1.00 g TiO2 nanoparticles were dispersed in 50 mL water in 100 mL quartz glass reactor, which got gas-closed with about 50 mL air and a Teflon magnetic stirring rod in it. The suspension in the reactor was magnetically stirred in dark. Flammable gases of 22.00 ppm CO, 2.45 ppm CH4, and 0.75 ppm H2 were surprisingly observed after 50 h of magnetic stirring. For reference, only 1.78 ppm CO, 2.17 ppm CH4, and 0.33 ppm H2 were obtained after the same time of magnetic stirring without TiO2 nanoparticles. Four magnetic stirring rods were simultaneously employed to further enhance the stirring, and as much as 30.04 ppm CO, 2.61 ppm CH4, and 8.98 ppm H2 were produced after 50 h of magnetic stirring. A mechanism for the catalytic role of TiO2 nanoparticles in producing the flammable gases is established, in which mechanical energy is absorbed through friction by TiO2 nanoparticles and converted into chemical energy for the reduction of CO2 and H2O. This finding clearly demonstrates a great potential for nanostructured semiconductors to utilize mechanical energy through friction for the production of flammable gases.

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Nano‐Ferroelectric for High Efficiency Overall Water Splitting under Ultrasonic Vibration

Cited by 194 publications

References 48 publications

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

Exceptional Cocatalyst‐Free Photo‐Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In‐Plane Polarization

Piezocatalysis and Piezo‐Photocatalysis: Catalysts Classification and Modification Strategy, Reaction Mechanism, and Practical Application

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

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