58 research outputs found
Achieving low energy consuming bio-based piezoelectric nanogenerators via modulating the inner layer thickness for a highly sensitive pedometer
Considering their drawbacks of environmental pollution, biodegradable cellulose-based materials are becoming one of the most promising alternative candidates for conventional petroleum-based polymers, which are considered the fundamental materials for dynamical units in human-machine interaction systems. Using an up-to-date hydrogen bond replacement strategy, which means using the highly electronegative Fâ in polyvinylidene fluoride (PVDF) to replace the intramolecular hydrogen bonds in cellulose for weakening the self-assembly behavior, herein, multilayer-structured piezoelectric nanogenerators (PENGs) composed of cellulose, a small amount of PVDF, and Ba0.7Ca0.3Zr0.2Ti0.8O3 (BCZT) fillers were fabricated via modified tape-casting technology. Due to the hydrogen bond network, which was confirmed using multiple characterization methods, the fillers dispersed uniformly in the matrix. Through changing the inner layer thickness, the output performance of the PENGs can be subtly modulated, which is revealed to be caused by the synergistic effect between the trapped electrons and the inter-squeezing between adjacent particles by employing the band theory. When applied to a pedometer, one of the essential devices for monitoring human health, such a modulation can significantly improve its sensitivity. The water contact angle test also indicates their potential for use in humid environments. Compared with some typical cellulose-based PENGs, our device shows outstanding performance in PD/F, defined as the power density triggered by unit force, indicating our PENG's low energy consumption characteristic.</p
Achieving ultrahigh energy storage density in super relaxor BCZT-based lead-free capacitors through multiphase coexistence
Dielectric capacitors own great potential in next-generation energy storage devices for their fast charge-discharge time, while low energy storage capacity limits their commercialization. Enormous lead-free ferroelectric ceramic capacitor systems have been reported in recent decades, and energy storage density has increased rapidly. By comparing with some ceramic systems with fashioned materials or techniques, which lacks repeatability, as reported latterly, we proposed a unique but straightforward way to boost the energy storage capacity in a modified conventional ferroelectric system. Through stoichiometric ratio regulation, the coexistence of the C-phase and T-phase was obtained in 0.85(Ba1-xCax)(ZryTi1-y)O3-0.15BiSmO3-2 wt. % MnO ceramics with x = 0.1 and y = 0.15 under the proof of the combination of Rietveld XRD refinement and transmission electron microscope measurement. The Wrec of 3.90 J/cm3, an excellent value for BCZT-based ceramic at the present stage, was obtained because of the co-contribution of the optimization of electric field distribution and the additional interfacial polarization triggered at the higher electric fields. The finite element simulation and physical deduction, which fits very well with our experimental result, were also performed. As to the practical application, stable performance in a long-time cycle and frequency stability was obtained, and excellent discharge behaviors were also achieved.</p
Phase transition behavior, dielectric and ferroelectric properties of (1 â x)(Bi0.5Na0.5)TiO3-xBa0.85Ca0.15Ti0.9Zr0.1O3 ceramics
(1 â x)(Bi0.5Na0.5)TiO3-xBa0.85Ca0.15Ti0.9Zr0.1O3 ceramics were prepared by solid state route and their phase structure and electric properties were investigated with the focus on optimizing properties for capacitor applications. There are two obvious maxima in the permittivity curves for x = 0.1â0.4 compositions. The first anomaly is suggested to be due to thermal evolution of LT-PNRs and the second one is attributed to the phase transition between the two types PNRs and the thermal evolution of HT-PNRs. The x = 0.3 sample has an operational temperature range from 87 âŠC to 310 âŠC. Most of the samples exhibit a dielectric thermal hysteresis. The x = 0.2â0.4 compositions exhibit a significant pinched P-E hysteresis loops. A large d33* of 427 pm/V was observed in 0.7BNT-0.3BCTZ composition. The x = 0.5â0.6 samples show a slim P-E hysteresis loop, and the sample with x = 0.5 exhibits high energy density of 0.6649 J/cm3 and energy storage efficiency of 83.17%, making it most suitable for application as high energy density capacitors
Research Progress in the Application of Chinese Herbal Medicines in Aquaculture: A Review
Due to increasing safety concerns regarding human consumption of fish products, an increasing number of medicinal chemicals are prohibited from use in aquaculture. As a result, Chinese herbal medicines are being increasingly used, coining the use of the term âgreen medicine.â Research shows that Chinese herbal medicines have many beneficial effects on fish, including growth promotion, enhancement of disease resistance, and improvement in meat quality. Many effective ingredients have been discovered in Chinese herbal medicines, which function to promote feed intake, improve meat flavor, and increase digestive enzyme activity. They also regulate and participate in processes that improve the specific and non-specific immunity of fish; however, the composition of Chinese herbal medicines is very complex and it is often difficult to identify the effective ingredients. This article reviews the latest research and application progress in Chinese herbal medicines regarding growth and feed utilization, immunity and disease resistance, and the meat quality of cultured fish. It also discusses research on the chemical constituents of classical Chinese medicinal herbs and problems with the application of Chinese herbal medicines in fish culture. This article concludes by proposing that future studies on Chinese herbal medicines should focus on how to cheaply refine and extract the effective ingredients in classical Chinese medicinal herbs, as well as how to use them efficiently in aquaculture
Impact of mechanical stress on barium titanate-based positive temperature coefficient resistive material
The sensitivity toward mechanical stress of barium titanate-based positive temperature coefficient resistor material was investigated by determining the resistance change with application of uniaxial stress from room temperature to 200 °C, which is well above the Curie temperature TC. Using the LandauâGinsburgâDevonshire theory the resistance increases in the paraelectric state, the negligible impact of stress close to TC and the observed increase in TC with increasing stress could be rationalized. For the ferroelectric state, the stressrelated resistance increase was attributed to ferroelasticity, a change in bulk permittivity and interfacial stress inducing a piezoelectric potential. The obtained results are also discussed with respect to recent endeavors to tune properties of potential barriers in piezoelectric semiconductors by mechanical stress
Decreasing polar-structure size : achieving superior energy storage properties and temperature stability in Na0.5Bi0.5TiO3-based ceramics for low electric field and high-temperature applications
It is a grand challenge to achieve high energy density (W) and efficiency (η) simultaneously under a low electric field (LE) to obtain new high energy storage capacitors. Similar to anti-ferroelectrics, the (1-x)NBT-xBaMg1/3Nb2/3O3 relaxor material exhibits a non-linear dependence on electric field, which is caused by a reversible field-induced phase transition. This leads to high W (2.37 J/cm3) and η (81.5 %) under a LE of 155 kV/cm, which makes it superior to other bulk ceramics. Combining large polarizability of Ba2+ in A-site and local structural heterogeneity on the B-site by Mg1/3Nb2/34+, enhanced relaxor behavior and decreased polar-structure size were induced in (1-x)NBT-xBaMg1/3Nb2/3O3 ceramics. The permittivity, nevertheless, stays high at âŒ2273±15 %. Furthermore, the electrical properties become stable in a wide temperature range from 44â396 °C for the sample with x=0.15. In addition, high current density/CD (450 A/cm2), power density/PD (23 MW/cm3) and discharge density/WD (0.57 J/cm3) were realized tested with pulse discharge testing. Our work will provide a development guidance for dielectric energy storage ceramics at low field and high fields with excellent temperature stability
Pulse discharge characterization of perovskite dielectric ceramics
The pulse discharge characterization of perovskite dielectric ceramics, which
has confronted a barrier between research and application, has the problems of
inconsistent test standards and lack of comparability. To mitigate this issue and
further advance the application process, we suggest an extrinsic standard (for
convenience of comparison) for energy dielectric ceramics of thickness
(0.2 mm), electrode area (4 mm2) and operation voltage (2 kV). We report the
pulse discharge performance parameters of three typical dielectric materials:
relaxor ferroelectric (Na0.5Bi0.5)0.9Li0.1Ti0.9Ta0.1O3 (NBLTT), paraelectric Ca0.6-Sr0.4TiO3 (CST) and linear dielectric K0.5Na0.5NbO3 (KNN) glass ceramics
through computer simulation and fitting of pulse discharge curves based on the
resistance-inductance-capacitor pulse discharge circuit. The NBLTT ceramics
exhibited higher peak current (16 A under 100 kV/cm) and stability with
minimal variation less than 15% from 20 to 150 ïżœC during pulse discharge
compared with linear dielectric and ferroelectric glass ceramics. In addition, the
NBLTT system holds the fast discharge time (90% of the discharge energy
density released in about 100 ns) and good fatigue resistance. The short discharge time, high thermal stability and low medium voltage (500â5000 V) make the NBLTT ceramics promising for pulse capacitor in large current and low
electric operation voltage conditions. An operable comparison standard and the
research frontiers of pulsed dielectric materials are prospected
High Energy Storage Density and Optical Transparency of Microwave Sintered Homogeneous (Na<sub>0.5</sub>Bi<sub>0.5</sub>)<sub>(1â<i>x</i>)</sub>ÂBa<sub><i>x</i></sub>Ti<sub>(1â<i>y</i>)</sub>ÂSn<sub><i>y</i></sub>O<sub>3</sub> Ceramics
Homogeneous
(Na<sub>0.5</sub>Bi<sub>0.5</sub>)<sub>(1â<i>x</i>)</sub>ÂBa<sub><i>x</i></sub>Ti<sub>(1â<i>y</i>)</sub>ÂSn<sub><i>y</i></sub>O<sub>3</sub> ceramics were densified by a combination of cold isostatic pressing
and microwave sintering (CIP&MS strategy), and their phase transition
and ferroelectric properties were investigated. X-ray diffraction
(XRD) analysis proves that the reaction between Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> (NBT) and BaSnO<sub>3</sub> (BSN) was suppressed
by fast sintering when <i>x</i> < 0.3. The grain size
of the homogeneous ceramic sample was about 1 ÎŒm, and the uniform
element distribution was detected by EDS mapping when <i>x</i> < 0.3. The <i>x</i> = 0.2 sample possesses a modest
dielectric constant (âŒ2000), low dielectric loss (tan ÎŽ
< 0.015), and highly diffusive and dispersive relaxor-like behavior.
The weakly polar phase gradually increases and the energy loss gradually
decreases with BSN addition. When <i>x</i> = 0.2, a high
transparency in the visible spectra (âŒ50%) and the high discharge
energy density (<i>W</i><sub>D</sub>) of 2.347 J/cm<sup>3</sup> were achieved as a result of high homogeneous sample, meanwhile <i>P</i><sub>m</sub> was as high as 35.75 ÎŒC/cm<sup>2</sup>. Then, a homogenization model was utilized to explain the high energy
storage properties
Structural Evolution and Enhanced Piezoelectric Activity in Novel Lead-Free BaTiO3-Ca(Sn1/2Zr1/2)O3 Solid Solutions
In this study, a series of solid solutions of (1−x)BaTiO3-xCa(Sn1/2Zr1/2)O3 (abbreviated as (1−x)BT-xCSZ, x = 0.00–0.15) ceramics have been prepared by the conventional solid-state reaction method to search for high performance lead-free piezoelectric materials. The structural evolution, microstructure, and piezoelectric properties are investigated. X-ray diffraction (XRD) results indicate that the phase symmetry strongly depends on the CSZ content. A tetragonal phase is well-maintained in the compositions of 0 ≤ x ≤ 0.03, and coexistence of tetragonal and cubic phases is obtained in the range of x = 0.06–0.09, beyond which a pure cubic phase becomes stable. More importantly, a significantly enhanced piezoelectric coefficient of d33 = 388 ± 9 pC/N is attained in the composition of x = 0.06 in the MPB region, where a tetragonal ferroelectric phase and an ergodic relaxor phase with average cubic symmetry coexist. Based on the analysis of crystal structure and dielectric properties, a temperature-composition phase diagram consisting of four phase regions is established. This study indicates that the lead-free BT-CSZ binary system has great potential for use in electromechanical transducer applications
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