CHEMICAL PHYSICS
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2024
·
IF 2
Xuecheng Ren,Mingxing Xiao,Kaidong Zhan,Fan Wu,Quinn Qiao
Inorganic lead-free perovskite Cs 3 B i2 I 9 has attracted extensive attention due to its enhanced stability and environmental friendliness. However, the photon-to-current conversion of Cs 3 B i2 I 9 perovskites is not efficient, partly due to inefficient electron-hole separation. In this manuscript, BiFeO 3 was deposited at the interface of Cs 3 Bi 2 I 9 /TiO 2 as the interface modifier by sol–gel method, and the photocurrent and responsiveness of the Cs 3 B i2 I 9 /BiFeO 3 /TiO 2 were significantly higher than those of the Cs 3 B i2 I 9 /TiO 2 based device. Kelvin probe force microscope, photoelectrochemical impedance spectroscopy and in-situ surface photovoltage spectra demonstrated that a self-polarized electric field of BiFeO 3 contributed to the separation of photogenerated charge carriers at the Cs 3 B i2 I 9 /TiO 2 interface. By analyzing the surface photovoltage phase spectra via a vector model method, complicated surface photovoltage processes were identified, and a detailed relationship between photocurrent generation and transfer characteristic of the photogenerated charge carriers have been discussed.
研究领域:
材料科学
·
光电化学
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Cheng Han,Lirong He,Qi Wang,Chuhong Zhang
Three-dimensional (3D) printing technologies possess incomparable advantages in fabricating 3D piezoelectric devices, enhancing the mechanical-to-electrical conversion efficiency. Among them, direct ink writing (DIW) holds great promise in constructing piezoelectric polymer devices as it enables self-polarization benefiting from the alignment of dipoles induced by the high pressure during the printing process. Besides, the electroactive phase of piezoelectric polymers is retained due to the operation is under ambient conditions. However, for the generally applied solvent-evaporation-assisted DIW technique, the architected structure suffers from drastic shrinkage and warpage in the final parts, which ultimately leads to a significant deviation from the programmed measure. In this work, for the first time, we develop a solvent-exchange-assisted DIW printing strategy to architect accurate and stable 3D PVDF PEH. This solvent exchange process in water not only enables the complete retaining of filament measure and generation of micropores to amplify the stain but also promotes the PVDF crystallization and formation of the β-phase. Moreover, trace vitamin B2 is formulated into the ink, affording self-polarized high β-phase content (95%) PVDF with good printability and optimal storage modulus to hold the 3D shapes. As a result, the 3D printed PVDF delivers an output voltage of 17.8 V, increased by 304% compared with device fabricated by solvent-evaporation-assisted DIW technique, and an impressive area output voltage density (11.04 V cm–2) which is twice that of the reported DIW printed PVDF PEH. This facile approach demonstrates a potential roadmap to high performance PEH through exploring complex 3D geometries enabled by the solvent-exchange-assisted 3D printing technique.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Rui Han,Lang Zheng,Guangzhao Li,Gang Chen,Sude Ma,Shuang Cai,Yijun Li
Micropiezoelectric devices have become one of the most competitive candidates for use in self-powered flexible and portable electronic products because of their instant response and mechanic–electric conversion ability. However, achievement of high output performance of micropiezoelectric devices is still a significant and challenging task. In this study, a poly(vinylidene fluoride) (PVDF)/MXene piezoelectric microdevice was fabricated through a microinjection molding process. The synergistic effect of both an intense shear rate (>104 s–1) as well as numerous polar C–F functional groups in MXene flakes promoted the formation of β-form crystals of PVDF in which the crystallinity of β-form could reach as high as 59.9%. Moreover, the shear-induced shish-kebab crystal structure with a high orientation degree (fh = ∼0.9) and the stacked MXene acted as the driving force for the dipoles to regularly arrange and produce a self-polarizing effect. Without further polarization, the fabricated piezoelectric microdevices exhibited an open-circuit voltage of 15.2 V and a short-circuit current of 497.3 nA, under optimal conditions (400 mm s–1 and 1 wt % MXene). Impressively, such piezoelectric microdevices can be used for energy storage and for sensing body motion to monitor exercise, and this may have a positive impact on next-generation smart sports equipment.
研究领域:
材料科学
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能源技术
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xingang Liu,Yinghao Shang,Jihai Zhang,Chuhong Zhang
Three-dimensional (3D) printing technologies have unparalleled advantages in constructing piezoelectric devices with three-dimensional structures, which are conducive to improving the efficiency of energy harvesting. Among them, fused deposition modeling (FDM) is the most widely used thanks to its low cost and wide range of molding materials. However, as the best piezoelectric polymer, a high electroactive β-phase poly(vinylidene fluoride) (PVDF) piezoelectric device cannot be directly obtained by FDM printing because the β-crystal is unstable at the molten state. Herein, we develop for the first time ionic liquid (IL)-assisted FDM for direct printing of β-PVDF piezoelectric devices. An IL can induce and maintain β crystals during melt extrusion and FDM printing, ensuring that the β-crystal in the printed PVDF device is as high as 98.3%, which is the highest in 3D-printed PVDF as far as we know. Furthermore, the shearing force provided by the FDM facilitates the directional arrangement of the dipoles, resulting in the printed PVDF device having self-polarization characteristics without poling. Finally, the piezoelectric output voltage of the 3D-printed PVDF device is 4.7 times that of the flat PVDF device, and its area current density (17.5 nA cm–2) is more than that of the reported 3D-printed PVDF piezoelectric device in the literature by two orders of magnitude. The one-step 3D printing strategy proposed in this paper can realize the rapid preparation of complex-shaped and lightweight self-polarized β-PVDF-based piezoelectric devices for energy harvesting.
研究领域:
材料科学
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能源技术
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3D 打印技术
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 13
·1909554
·
IF 16.836
Hui Liu,Shichao Zhang,Lifang Liu,Jianyong Yu,Bin Ding
Particulate matter (PM) pollution in air is thought to be an important mortality risk factor globally. Most existing air filters face the extreme challenge of effectively removing PM 0.3 , which has the most penetration particle size (MPPS) of ≈0.3 µm yet is particularly harmful. Here, an innovative in situ electret electrospinning/netting technique that can manipulate both solution phase separation and crystal phase transition is reported to develop self-polarized polyvinylidene fluoride nanofiber/net membranes with 2D networks and superior surface adhesion. By combining the true nanoscale diameter (≈21 nm), small pore size (≈0.26 µm), and highly electret surface (6.8 kV potential) of the 2D nanonets, the synergistic effect of sieving and adhesion for MPPS PM 0.3 is achieved. Such double capture characteristic enables the high-efficiency (≈99.998%) capture of PM 0.3 while maintaining low air resistance (≈0.1% atmosphere pressure). Moreover, the nanofiber/net filters show integrated properties of superhydrophobicity, desirable transparency (91%), and long-term stability. The synthesis of such attractive nanomaterials presents a promising attempt toward the development of high-performance filtration/separation materials for numerous applications.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 15
·2200114
·
IF 15.153
Lirong He,Jin Lu,Cheng Han,Xingang Liu,Jingfeng Liu,Chuhong Zhang
Piezoelectric pressure sensors are important for applications in robotics, artificial intelligence, communication devices, etc. The hyperboloid is theoretically predicted to be an unusual 3D structure that allows concerted piezoelectric enhancement owing to its synergistic effects of geometrical stress confinement and stress concentration, but has not been experimentally fulfilled due to a lack of efficient architecting techniques. In this work, a 3D hyperboloidal arrayed self-polarized PVDF piezoelectric energy harvester (PEH) is successfully fabricated by incorporating electrohydrodynamic (EHD) pulling technology into fused deposition modeling (FDM) 3D printing. This strategy not only simplifies the layer-by-layer constructing procedure for arrays, but simultaneously realizes a self-polarized and high β-phase (92%) PVDF PEH in a single electric-pulling step, saving posttreatment such as poling and removing excessive additives. Such a PEH delivers a significantly enhanced piezoelectric potential which is around 8 times that of a 2D flat film sensor. Moreover, this PEH featuring excellent linearity within a wide pressure regime, enables the sensing of human activities in a relatively large force range, which is otherwise difficult for traditional film sensors to differentiate. This work demonstrates a potential roadmap to advanced piezoelectric sensors exploiting unusual 3D structures enabled by the unique EHD pulling coupled 3D printing technique.
研究领域:
材料科学
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电子工程
·
先进制造
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yanbing Zhu,Hao Xiu,Gang Xue,Tianyong Lei,Yu Wang,Zhongfang Li,Shuren Cong,Tingting Wei
The piezoelectric properties are closely related to the properties of photocatalytic membrane in water environment. Here, a self-polarized g-C 3 N 4 /MoO 3 /PVDF-TrFE membrane with high piezoelectricity was synthesized using a facile spin-coating strategy. In the presence of a low-speed water flow, a stabilized photocatalytic hydrogen evolution rate (538.8 µmol g -1 h −1 ) was obtained for the g-C 3 N 4 /MoO 3 /PVDF-TrFE membrane. Experimental results revealed that the g-C 3 N 4 /MoO 3 induced a reorganization of PVDF-TrFE structure and thereby enlarged the polarization electric field to promote the directional migration of charge carriers and exciton dissociation. Additionally, pressure current test demonstrated that under the same pressure conditions, g-C 3 N 4 /MoO 3 /PVDF-TrFE exhibited a higher response than PVDF-TrFE. This work establishes a new method for the polarization electric field and provides a deeper understanding of the hydrogen evolution mechanism.
研究领域:
材料科学
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催化化学
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 5
·1907650
·
IF 15.621
Yong Zhang,Xiaoyue Zhao,Jiaxin Chen,Siyuan Li,Wei Yang,Xiaosheng Fang
ZnO film ultraviolet photodetectors (UV PDs) have always suffered from slow speed and low photosensitivity that restrict their broader applications. To break through those barriers, high-performance ZnO UV PD based on self-polarized BaTiO 3 (BTO) is first introduced through a facile one-step spin-coating method. Compared with pure ZnO film UV PD with low on/off ratio (65) and slow speed (4.1/7.5 s) at 3 V bias under 350 nm UV light, the BTO-ZnO bilayer film device exhibits an ultrahigh on/off ratio (14 300) and ultrafast response speed (0.11/5.80 ms), which is much faster than that of the most reported ZnO film-based UV PDs. The numerical simulation demonstrates that the spatial distribution of electron concentration of ZnO film is regulated by the self-polarization of BTO film, resulting in low dark current and fast response time of the BTO-ZnO PD. This work provides a new approach to fabricate high-performance PDs based on self-polarized ferroelectric materials.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 18
·2300650
·
IF 15.1
You Xue,Tao Yang,Yapeng Zheng,Kang Wang,Enhui Wang,Hongyang Wang,Laipan Zhu,Zhentao Du,Hailong Wang,Kuo-Chih Chou,Xinmei Hou
Piezoelectric nanogenerator (PENG) for practical application is constrained by low output and difficult polarization. In this work, a kind of flexible PENG with high output and self-polarization is fabricated by constructing CsPbBr 3 –Ti 3 C 2 T x heterojunctions in PVDF fiber. The polarized charges rapidly migrate to the electrodes from the Ti 3 C 2 T x nanosheets by forming heterojunctions, achieving the maximum utilization of polarized charges and leading to enhanced piezoelectric output macroscopically. Optimally, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits an excellent voltage output of 160 V under self-polarization conditions, which is higher than other self-polarized PENG previously. Further, the working principle and self-polarization mechanism are uncovered by calculating the interfacial charge and electric field using first-principles calculation. In addition, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits better water and thermal stability attributed to the protection of PVDF. It is also evaluated in practice by harvesting the energy from human palm taps and successfully lighting up 150 LEDs and an electronic watch. This work presents a new idea of design for high-performance self-polarization PENG.
研究领域:
材料科学
·
纳米技术
·
能量收集
·
电化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Huang Zhao-Xia,Li Lan-Wei,Huang Yun-Zhi,Rao Wen-Xu,Jiang Hao-Wei,Wang Jin,Zhang Huan-Huan,He He-Zhi,Qu Jin-Ping
Lightweight flexible piezoelectric polymers are demanded for various applications. However, the low instinctively piezoelectric coefficient ( i.e . d33) and complex poling process greatly resist their applications. Herein, we show that introducing dynamic pressure during fabrication is capable for poling polyvinylidene difluoride/barium titanate (PVDF/BTO) composites with d33 of ~51.20 pC/N at low density of ~0.64 g/cm 3 . The melt-state dynamic pressure driven energy implantation induces structure evolutions of both PVDF and BTO are demonstrated as reasons for self-poling. Then, the porous material is employed as pressure sensor with a high output of ~20.0 V and sensitivity of ~132.87 mV/kPa. Besides, the energy harvesting experiment suggests power density of ~58.7 mW/m 2 can be achieved for 10 N pressure with a long-term durability. In summary, we not only provide a high performance lightweight, flexible piezoelectric polymer composite towards sustainable self-powered sensing and energy harvesting, but also pave an avenue for electrical-free fabrication of piezoelectric polymers.
研究领域:
材料科学
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能源技术
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2022
·
IF 19.069
Xin Huang,Yuyan Wang,Xinxing Zhang
Despite significant efforts to develop piezoelectric nanogenerators (PENGs), scalable manufacture of polymeric PENGs with highly sensitive and stable piezoelectric output remains a great challenge. Here, we propose a noncovalent assembly-mediated solid-state drawing strategy for the electrical treatment-free fabrication of high-performance PENGs with hierarchically anisotropic structure. Along with the stress-induced anisotropic alignment of glycine modified-molybdenum disulfide nanosheets , the strong intermolecular interactions and confinement between 2D nanosheets and polyvinylidene fluoride (PVDF) dipoles can aggressively induce the self-polarized β-phase transition of PVDF in a favorable direction. The resulted nanocomposite without extra electrical treatment exhibits remarkable piezoelectric performance (d 33 =24.9 pC N -1 ) and extraordinary mechanical performance (tensile strength of 213.3 MPa, toughness of 85.8 MJ m -3 ), far surpassing most reported polymeric piezoelectric materials . Taking these advantages, the PENGs-based self-powered physiological sensors show highly sensitive and stable output signals, satisfying the requirements of tiny and large human motions monitoring. This work opens an avenue toward large-area compliant and low-energy manufacturing of diverse energy harvesting devices and self-powered sensory systems.
研究领域:
材料科学
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纳米技术
·
能源 harvesting
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xingang Liu,Xi Li,Xingneng Wei,Junyu Chen,Yijun Li,Chuhong Zhang
Porous poly(vinylidene fluoride) (PVDF) attracts considerable attention for mechanical energy harvesting and self-powered systems owing to its exceptional electromechanical coupling capabilities. Supercritical carbon dioxide foaming (SCF) that features solvent-free and green nature is one of the most preferable approaches to construct controllably porous polymers. Nonetheless, the electroactive β-phase of PVDF remains elusive during SCF due to its instability under an elevated temperature. Herein, we pioneer the use of ionic liquid (IL)-assisted SCF for the fabrication of self-polarized β-PVDF piezoelectric foam with tailored cells. IL incorporation not only facilitates CO2 infusion but also catalyzes the formation and preservation of β-phase crystals throughout the SCF process, culminating in a PVDF foam with an exceptionally high β-phase content (98%). Furthermore, the constructed honeycomb-like pore can effectively absorb external forces and significantly amplify the compressive strain, substantially enhancing the piezoelectric output of the PVDF foam. Impressively, PVDF foam with circumferential pore delivers a maximum piezoelectric output of 19.1 V, setting a new benchmark for SCF fabricated PVDF-based foam PEH. This advanced piezoelectric PVDF foam demonstrates significant potential as a flexible sensor for real-time monitoring of human foot pressure, highlighting its utility in adaptive sensing applications.
研究领域:
材料科学
·
高分子科学
·
能量转换与存储
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纳米技术
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）