MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yan Zhu,Xing Ji,Yuli Xiong,Jiangna Guo,Shuangrui Yao,Qingxin Lai,Ping Li,Yunhuai Zhang,Peng Xiao
Spontaneous polarization field in ferroelectric can improve the oxidation kinetics and photocurrent of a photoanode in photoelectrochemical water splitting. But the impact of ferroelectric polarization field on the migration of different charge carriers which have different mobility and diffusion length is still unknown. In this work, we synthesized tetragonal BaTiO 3 nanoparticles by solvothermal method successfully and fabricated the hybrid photoanode composed by monoclinic WO 3 and BaTiO 3 for solar water oxidation. Density functional theory calculations showed that the mobility of electron was faster than that of the hole in WO 3, and had a longer diffusion length. We demonstrated that the polarization field of ferroelectric had a greatly impact upon holes migration compared with electrons, thus the thin hybrid photoanode after poling by bias presented a significant improvement of photocurrent (210.5%) under the back-side illumination, and a remarkable augment of charge separation efficiency (94%) and oxidation kinetics (69%) at 1.23 V. Our work provided a deeper understanding of how ferroelectric polarization field affected the photoelectrochemical water oxidation and a general pathway towards enhancing minority carrier collection in photoanode.
研究领域:
材料科学
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Fei Liu,Xiangjie Zhuang,Zoufei Du,Yi Dan,Yun Huang,Long Jiang
Although photocatalysts can convert plastic wastes into energy fuels and show unique advantages in the treatment of plastic wastes, photocatalytic efficiency is still limited by the fast recombination of photoexcited charges. In this paper, potassium niobate (KNbO 3 ) nanosheet with the ferroelectric property was synthesized and polarized under an external electric field. Polarization does not change the morphology and structure of KNbO 3 , but effectively enhances the spontaneous polarization field. This spontaneous polarization field exists through the whole material and can effectively improve the separation of photogenerated charges. The photocatalytic efficiency of polarized KNbO 3 (P-KNbO 3 ) for degradation of PE and PP improves by about 210 % and 140 %, compared with KNbO 3 . P-KNbO 3 also shows excellent photocatalytic activity for the degradation of real-world waste plastic products (plastic bags, gloves, tubes and boxes). This study might provide insights into designing high-efficiency photocatalysts for plastic waste treatment by regulating and controlling the polarization of ferroelectric materials.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Leqi Chen,Zhaoshi Yu,Xing Ji,Rui Huang,Li Luo,Zhixin Tang,Peng Xiao,Yunhuai Zhang
The polarization field of ferroelectric materials can increase the performance of a photoelectrode by manipulating the band bending at the solid-liquid interface. However, the effect of pH of an electrolyte to the ferroelectric polarization field when applied to photoelectrochemical water oxidation is still not clear. In this work, hematite and tetragonal barium titanate nanoparticles are synthesized to construct a ferroelectric-semiconductor hybrid photoanode. We find that the photocurrent density of the positive polarized photoanode is improved about 30% in the near neutral electrolyte. However, this effect is disappeared in the high pH electrolyte. The ferroelectric polarization field is beneficial to improve the surface states and the donor density in the space charge layer of the photoanode to enhance the hole collection ability and the water oxidation kinetics in a near neutral electrolyte. Through the molecular dynamic simulation, we find that the adsorption capacity of OH − groups on the polarized barium titanate is reduced at high pH value, thus weakens the impact of the ferroelectric polarization field. Our work can maximize the utilization of the ferroelectric materials by selecting the pH value of the electrolyte and provides a new insight into the mechanism of ferroelectrics on photoelectrochemical reactions.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 2
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IF 4
Pang Weitao,Ye Zhiwei,Yi Juan,Zhang Shixian,Chen Junyu,Fu Yuheng,Zhang Yibo,Ding Changwei,Xiong Chuanxi
A poly(vinylidene fluoride)-based composite film with higher piezoelectric properties was prepared by the solvent mixing method of adding liquid crystal small molecules to create defects among polyvinylidene fluoride (PVDF) molecular chains. The composite obtained by simple uniaxial stretching and thermal polarization exhibits higher piezoelectric properties (d 33 = 29.0 pC/N) than neat PVDF (d 33 = 24.3 pC/N). The defects reduce the grain size of PVDF to some extent, thus reducing the coercivity field of PVDF from 64.6 to 58.1 MV/m. This strategy could endow PVDF with higher piezoelectric coefficient and lower polarization field, which is attractive for piezoelectric applications.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Haiyang Liu,Mengyu Liu,Chunmiao Zhang,Feiya Xu,Xuanli Zheng,Xu Li,Zhiming Wu,Yaping Wu,Junyong Kang
Janus transition metal dichalcogenides host a unique structural asymmetry that enhances their potential for spintronics and valleytronics. Here, using a phase engineering strategy, a hybrid H/T-MoSeS monolayer is synthesized via in situ plasma substitution. Theoretical analysis predicts a valley splitting of 7.35 meV, which is experimentally realized, with a 2.7-fold enhancement in the g-factor compared to the H-MoSeS. The substantial valley splitting originates from the additional exchange interactions and spin imbalance introduced by the T-phase. The coupling with the T phase further results in electrically tunable valley polarization, which reveals a sharp increase within ±20 V, gradually saturates at higher voltages, and reaches a high ratio of up to 43.8% for trions at room temperature. Such an enhancement is accompanied by elongated exciton lifetimes due to the increased electron concentration and phase-modulated Janus polarization field. All these findings reveal the synergistic interplay between phase engineering and the polarization field in Janus structures, providing a development strategy for 2D spin-valley devices with designed phase components and structural symmetry.
研究领域:
凝聚态物理
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材料科学
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纳米科技
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半导体物理
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低维材料
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自旋电子学
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激子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ming Liu,Aikun Liu,Hongjian Zhang,Shuxuan Li,Yong Zhang
The coupling effect of piezo-photocatalytic technology is well demonstrated as a promising strategy for effective degradation of organic pollutants. However, the catalytic efficiency is dramatically limited by the undesirable neutralization of photogenerated electron-hole pairs. Herein, PVDF@Bi 2 MoO 6 /BiOBr heterojunction was designed elaborately to boosting their piezo-photocatalytic activity by built-in polarization field and controlled carrier transfer. The composite film presents excellent degradation performance of methyl orange (MO, 15 mg/L) (98.99%, 120 min) under the simultaneous ultrasonic vibration and visible light irradiation, which is around 2 and 3.1 times than that of individual piezoelectric and photocatalytic process. The improved piezo-photocatalytic capability could be attributed to the enhanced built-in piezoelectric field that generated by the vibration of p-type BiOBr nanosheets . The construction of piezoelectric polarization reduces the recombination efficiency of photogenerated carriers at the p-n heterojunction interface, thereby dramatically improving the catalytic efficiency. This work proposes and demonstrates the very positive role of dual piezoelectricity in modulating the photocatalytic efficiency in semiconductors, which provides a new paradigm for the further development of highly-efficient piezo-photocatalysts to be applied in environmental purification and wastewater treatment.
研究领域:
材料科学
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环境科学
·
催化技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jian Gao,Shu Wang,Yupu Liu,Denghui Yang,Xin Li,Fangzheng Yuan,Shuang Han,Wenlong Yang,Hui Zhang
It is of great significance and challenges to construct physical field-enhanced photocatalysts for energy and environmental applications. Herein, an artificial-photosynthesized CdS/PbTiO 3 S-scheme heterostructures with the enhancement of polarization electric field have been developed to promote the bifunctionally catalytic efficiencies for Cr(VI) photoreduction degradation of heavy metal pollution and Tetracycline (TC) photooxidation degradation of antibiotic. In our work, CdS nanoparticles are selectively grown on the positive polarization planes of PbTiO 3 microplates to form the same direction for both the ferroelectric polarization field of PbTiO 3 and the built-in electric field of S-scheme heterojunction. In this case, the stable heterostructures of PTO(00−1)/CdS(010) are obtained, and the greatly improved photocatalytic performances of redox degradation are achieved. The charge transfer mechanism and the synergetic effect between the spontaneous ferroelectric polarization and S-scheme heterojunction have been revealed by DFT calculations and experimental verifications. This interesting finding provides new insight into the design of efficient artificial-photosynthesized photocatalytic systems and we hope our work could serve as a valuable reference for our colleagues.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Ting Sun,Chuanyezi Cai,Jiacheng Guo,Bixuan Zhu,Xi Chen,Yu He,Weihao Zhong,Ruiqi He,Lu Ye,Jianjun Zhang,Sude Ma
As a ferroelectric polymer with excellent performance, polyvinylidene difluoride (PVDF) has an irreplaceable position in film capacitors. However, the problem of polarization hysteresis needs to be effectively improved. Consequently, linear polymer polymethyl methacrylate (PMMA) was introduced into the PVDF blend, and PMMA could inhibit the polarization behavior of PVDF in the amorphous region, thus weakening the local polarization field and reducing the coherent coupling between ferroelectric domains. In addition, high dielectric constant barium titanate (BaTiO 3 ) nanoparticles were introduced to enhance the depolarization field inside the crystalline phase, and the synergistic effect of PMMA and BaTiO 3 improved the polarization hysteresis and dielectric properties of PVDF. Preparation of PVDF/PMMA/BaTiO 3 films was undertaken through the utilization of a spin-coating process, and the film thicknesses were uniform without obvious aggregation. The maximum discharge energy density of the 30 wt.% BaTiO 3 nanocomposite film was 1.87 J/cm 3 , and the dielectric loss (tanδ) can be stabilized at 0.12 and below. At 100 Hz, the E b and tanδ of the 30 wt.% BaTiO 3 nanocomposite film were 1400 kV/cm and 0.12, respectively. The favorable performance of the films has also been displayed by the phase field simulation results.
研究领域:
材料科学
·
高分子科学
·
纳米技术
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介电与电磁学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yandong Xu,Wenhao Su,Zihui Jing,Zhouyu Jiang,Mingliang Wang
The development of highly active photocatalysts for H 2 O 2 production is of significant practical importance for addressing environmental issues and energy shortages. In this study, an S-scheme heterojunction photocatalyst with strong redox performance was synthesized through the in-situ growth of the TpPa-Cl covalent organic framework (COF) material on the surface of Cu-loaded ZnO nanorods. The incorporation of Cu disrupts the charge shielding effect of ZnO, promotes the spatial separation of charge carriers, and enhances piezoelectric catalytic activity. Furthermore, the porous ultra-thin COF layer extends carrier lifetime and increases the contact area with reactants, endowing the composite with strong light absorption capacity and excellent oxygen reduction performance. Under the combined influence of the piezoelectric-photocatalytic dual electric field, the H 2 O 2 yield of the composite in pure water reached 1838.8 μmol g −1 h −1 , and the resulting H 2 O 2 solution can be directly utilized for pollutant removal and water disinfection. In situ X-ray photoelectron spectroscopy, density functional theory calculations, and electron spin resonance studies elucidate the S-scheme electron transfer mechanism, which accelerates the transfer of photogenerated carriers and enhances the utilization of electron-hole pairs. This research offers a novel approach for the design and development of catalysts aimed at efficient H 2 O 2 production.
研究领域:
光催化
·
材料科学
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环境科学
·
纳米技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wangchuan Zhu,Chuantao Wang,Xiang Li,Wenhui Shi,Qiyu Chen,Xinlei Bai,Feng Fu,Danjun Wang,Chunming Yang
Advanced oxidation processes based on piezo-promoted peroxymonosulfate (PMS) activation in environmental remediation have been widely applied, but the treatment efficiency of pollutants was restricted by sluggish charge separation and low affinity of PMS. Herein, trace iron-doped layered molybdenum disulfide (Fe/MoS 2 ) was used to degrade pollutants by piezo-promoted PMS activation. Real-time reaction site changes in carbamazepine (CBZ) degradation process were predicted by Fukui function calculation of the reaction intermediates, and the possible degradation pathways were given. Through piezoresponse force microscopy and calculation of the adsorption energy, electronic localized functions and Crystal Orbital Hamilton Population, it was verified that Fe doping improves the adsorption of oxygen-containing reactants on MoS 2 , enhancing the electron delocalization and piezo-polarization field, thus accelerating the piezo-promoted PMS activation kinetics. The degradation efficiency of CBZ on Fe/MoS 2 (0.44 min −1 ) was about 22 times than that of MoS 2 . Piezo-promoted PMS activation strategy based on Fe/MoS 2 still maintains a high removal rate in the treatment of dye and antibiotic pollutants such as ornidazole, rhodamine B, tetracycline, methyl orange, chlortetracycline. This study provides insights into the mechanism by which piezo-promoted PMS activation, and achieving high chemical efficiency for pollutants removal.
研究领域:
环境科学
·
化学工程
·
材料科学
·
高级氧化过程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Yaning Xu,Chong Guo,Weiqi Qian,Chris R. Bowen,Ya Yang
Ferroelectric materials, owing to their unique optoelectronic effect and intrinsic polarization fields, are capable of accurately extract image features in outdoor lighting environments, which is highly challenging in machine vision systems. However, conventional ferroelectric-based vision sensors, confined to image sensing, incur latency and additional power consumption during data transmission. Here we report a dual-mode vision sensor based on a ferroelectric Bi x Sm 2-x O 3 film that achieves high-contrast imaging and storage functionalities. By strategically leveraging the photoelectric effect and the heat-sensitive characteristic of the ferroelectric polarization field, the polarization intensity of the ferroelectric film can be precisely modulated to achieve time-scale controllable photocurrent reversal, thereby significantly enhancing imaging contrast, while exploiting the non-volatile nature of the ferroelectric polarization to achieve an image storage functionality. The developed sensor array facilitates accurate extraction of target shape features, enabling high-contrast imaging in uneven light conditions. This integrated sensing-memory architecture establishes a new paradigm for robust machine vision systems operating in challenging environmental conditions.
研究领域:
光电子学
·
铁电器件
·
图像传感器
·
机器视觉
·
智能传感系统
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）