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学者姓名：侯育冬
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摘要 ：
The rapid development of flexible micropower electronics has aided the opportunity for the broader application of flexible piezoelectric composites (PCs) but has also led to higher requirements for their power generation. Among them, 0-3 PCs with embedded zero-dimension piezoparticle fillers, although low cost and easy to prepare, suffer from suboptimal output performance because of inherent structural defects. In this work, the voltage output was increased from 3.4 to 12.7 V under a force of 7 N, through first-step regulation by aligning the KNbO3 (KN) particles in the polydimethylsiloxane (PDMS) matrix; then, a significantly enhanced current output (from 0.7 to 4.5 mu A) through second-step regulation by introducing copper nanorods (Cu NRs) interspersed in the gaps between the KN chains. Consequently, the proposed PC exhibits much higher power density, 37.3 mu W/cm(2), than that of random KN/PDMS and thus shows good potential for high-performance, flexible piezoelectric energy harvesters.
关键词 ：
flexible energy harvester flexible energy harvester piezoelectric composite piezoelectric composite poling efficiency poling efficiency stress transfer stress transfer structure designing structure designing
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| GB/T 7714 | Wang, Chenwei , Gao, Xin , Zheng, Mupeng et al. Two-Step Regulation Strategy Improving Stress Transfer and Poling Efficiency Boosts Piezoelectric Performance of 0-3 Piezocomposites [J]. | ACS APPLIED MATERIALS & INTERFACES , 2021 , 13 (35) : 41735-41743 . |
| MLA | Wang, Chenwei et al. "Two-Step Regulation Strategy Improving Stress Transfer and Poling Efficiency Boosts Piezoelectric Performance of 0-3 Piezocomposites" . | ACS APPLIED MATERIALS & INTERFACES 13 . 35 (2021) : 41735-41743 . |
| APA | Wang, Chenwei , Gao, Xin , Zheng, Mupeng , Zhu, Mankang , Hou, Yudong . Two-Step Regulation Strategy Improving Stress Transfer and Poling Efficiency Boosts Piezoelectric Performance of 0-3 Piezocomposites . | ACS APPLIED MATERIALS & INTERFACES , 2021 , 13 (35) , 41735-41743 . |
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摘要 ：
Lead-free piezoceramics are international research frontier in the fields of functional materials. In this work, high-quality Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCTZ) ceramics were prepared by using ultrafine powder synthesized by the molten salt method. The results show that the enhanced piezoelectric properties are obtained at intermediate grain size of 14.7 mu m. Furthermore, by the optimization of the DC poling parameters, excellent d(33) similar to 600 pC/N and k(p) similar to 0.50 values of BCTZ lead-free ceramic can be obtained, while d(33) similar to 420 pC/N and k(p) similar to 0.35 were obtained under the optimal AC poling parameters. The property difference is mainly due to that AC poling does not give enough time for the internal stress to relax, allowing the switched ferroelastic domains to accommodate each other, so it is difficult to achieve saturated poling. Though, AC poling method still provides a new insight for the optimization of the performance of piezoelectric ceramics.
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| GB/T 7714 | Zhao, Kang , Zheng, Mupeng , Yan, Xiaodong et al. Effect of direct current and alternating current poling on the piezoelectric properties of Ba0.85Ca0.15Ti0.9Zr0.1O3 ceramics [J]. | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2021 , 32 (23) : 27815-27822 . |
| MLA | Zhao, Kang et al. "Effect of direct current and alternating current poling on the piezoelectric properties of Ba0.85Ca0.15Ti0.9Zr0.1O3 ceramics" . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 32 . 23 (2021) : 27815-27822 . |
| APA | Zhao, Kang , Zheng, Mupeng , Yan, Xiaodong , Zhu, Mankang , Hou, Yudong . Effect of direct current and alternating current poling on the piezoelectric properties of Ba0.85Ca0.15Ti0.9Zr0.1O3 ceramics . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2021 , 32 (23) , 27815-27822 . |
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摘要 ：
Quenching alkaline bismuth titanates from sintering temperatures results in increased lattice distortion and consequently higher depolarization temperature. This work investigates the influence of quenching on the ergodicity of relaxor Na1/2Bi1/2TiO3-BaTiO3-K0.5Na0.5NbO3. A distinct departure from ergodicity is evidenced from the increase in remanent polarization and the absence of frequency dispersion in the permittivity response of poled samples. Further, the samples exhibit enhanced negative strain upon application of electric field, indicating proclivity towards correlated polar nanoregions, corroborated by the enhanced tetragonal distortion. As a result, ergodic relaxor Na1/2Bi1/2TiO3-6BaTiO(3)-3K(0.5)Na(0.5)NbO(3) exhibits a depolarization temperature of 85 degrees C with a 60% increase in remanent polarization and approximately a threefold increase in remanent strain upon quenching. Quenching-induced changes in the local environment of Na+ and Bi3+ cations hinder the development of ergodicity promoted by the A-site disorder. These results provide new insight into tailoring ergodicity of relaxor ferroelectrics.
关键词 ：
ferroelectricity ferroelectricity ferroelectric materials ferroelectric materials free ceramics free ceramics lead‐ lead‐ relaxors relaxors
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| GB/T 7714 | Wei, Qiumei , Riaz, Adeel , Zhukov, Sergey et al. Quenching-circumvented ergodicity in relaxor Na1/2Bi1/2TiO3-BaTiO3-K0.5Na0.5NbO3 [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2021 , 104 (7) : 3316-3324 . |
| MLA | Wei, Qiumei et al. "Quenching-circumvented ergodicity in relaxor Na1/2Bi1/2TiO3-BaTiO3-K0.5Na0.5NbO3" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 104 . 7 (2021) : 3316-3324 . |
| APA | Wei, Qiumei , Riaz, Adeel , Zhukov, Sergey , Hofmann, Kathrin , Zhu, Mankang , Hou, Yudong et al. Quenching-circumvented ergodicity in relaxor Na1/2Bi1/2TiO3-BaTiO3-K0.5Na0.5NbO3 . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2021 , 104 (7) , 3316-3324 . |
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摘要 ：
Flexible piezoelectric energy harvesters that efficiently convert mechanical energy into electrical energy have been extensively studied due to their great application potential in low-power wearable electronics and self-powered sensors. However, the low current output and poor thermal fatigue resistance severely restrict their practical applications. Here, we propose a new strategy to simultaneously improve the current density and thermal conductivity of the flexible piezocomposites (PCs) by designing delivery paths. High-quality (Ba0·85Ca0.15) (Ti0·90Zr0.10)O3/copper nanorods/polydimethylsiloxane (BCZT/Cu NRs/PDMS) PCs with a novel co-chained structure prepared using a well-suited technique of dielectrophoresis were reported for the first time. The BCZT particles and Cu NRs aligned in same chains throughout PDMS matrix results in an efficient delivery path both for induced charge transfer and heat dissipation, thus leading to ultrahigh current density (4.7 μA/cm2) and thermal conductivity (0.31 W/(m · K)). Further, a faster charging speed and a dramatically fatigue stability were realized in the co-chained PCs. Our work is expected to provide a potential solution for simultaneously enhancing current density and heat dissipation for a variety of composites in the field of flexible energy harvesting. © 2021 Elsevier Ltd
关键词 ：
Charge transfer Charge transfer Copper compounds Copper compounds Current density Current density Electrophoresis Electrophoresis Energy harvesting Energy harvesting Flexible electronics Flexible electronics Nanorods Nanorods Thermal conductivity Thermal conductivity Thermal fatigue Thermal fatigue
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| GB/T 7714 | Gao, Xin , Zheng, Mupeng , Yan, Xiaodong et al. Ultrahigh current density and fatigue stability in flexible energy harvester by designing delivery paths [J]. | Materials Today Physics , 2021 , 19 . |
| MLA | Gao, Xin et al. "Ultrahigh current density and fatigue stability in flexible energy harvester by designing delivery paths" . | Materials Today Physics 19 (2021) . |
| APA | Gao, Xin , Zheng, Mupeng , Yan, Xiaodong , Zhu, Mankang , Hou, Yudong . Ultrahigh current density and fatigue stability in flexible energy harvester by designing delivery paths . | Materials Today Physics , 2021 , 19 . |
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摘要 ：
In this work, high-quality (Ca1-xBix)(Mo1-xVx)O-4 (0.15 <= x <= 0.5) ceramics with a tetragonal scheelite structure were prepared at sintering temperatures of 800-925 degrees C. Their microstructures, alternating current impedance, and microwave dielectric properties were studied comprehensively. Through scanning electron microscopy and transmission electron microscopy analyses, the low-temperature sintering mechanism was clarified to be the dissolution-precipitation process of small particles in the liquid phase of the grain boundary. The increase in point defects led to an increase in extrinsic loss, which might be the main ex-trinsic factor affecting the Qxf (Q = quality factor = 1/dielectric loss, f = resonant frequency) value. The (Ca0.65Bi0.35)(Mo0.65V0.35)O-4 ceramic sintered at 875 degrees C for 4 h exhibited superior microwave dielectric properties, with permittivity (epsilon(r)) similar to 17, Qxf value similar to 12080 GHz (at 9.86 GHz), and near-zero temperature coefficient of resonance frequency (tau(f)) similar to + 3.6 ppm/degrees C; thus, the ceramic has great potential for the LTCC application. (C) 2021 Elsevier B.V. All rights reserved.
关键词 ：
Impedance spectroscopy Impedance spectroscopy Microwave dielectric properties Microwave dielectric properties Scheelite structure Scheelite structure Sintering mechanism Sintering mechanism
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| GB/T 7714 | Li, Yongqiang , Zheng, Mupeng , Zhu, Mankang et al. Microwave dielectric properties and low-temperature sintering mechanism in (Ca,Bi)(Mo,V)O-4 ceramics [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 889 . |
| MLA | Li, Yongqiang et al. "Microwave dielectric properties and low-temperature sintering mechanism in (Ca,Bi)(Mo,V)O-4 ceramics" . | JOURNAL OF ALLOYS AND COMPOUNDS 889 (2021) . |
| APA | Li, Yongqiang , Zheng, Mupeng , Zhu, Mankang , Hou, Yudong . Microwave dielectric properties and low-temperature sintering mechanism in (Ca,Bi)(Mo,V)O-4 ceramics . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 889 . |
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摘要 ：
In this work, an outstanding recoverable energy density (2.88 J/cm(3)) was achieved under a low field of 150 kV/ cm by introducing 4.0 mol.% NaTaO3(NT) into 0.76 K0.5Bi0.5TiO3-0.24BiFeO(3) (abbreviating as 4NT), which is fabricated by the conventional solid oxide reaction route. Introduction of NT enhances the relaxor behavior, and favors the temperature insensitivity of energy storage performance. Furthermore, the polarization contribution coming from the remanent ferroelectric order makes the 4NT sample show excellent recoverable energy density. Our findings provide the promising perspective of K0.5Bi0.5TiO3-based ceramics in dielectric energy storage application.
关键词 ：
Energy storage density Energy storage density K0.5Bi0.5TiO3 K0.5Bi0.5TiO3 Low electric field Low electric field Relaxor ferroelectric Relaxor ferroelectric
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| GB/T 7714 | Yang, Qian , Zhu, Mankang , Wei, Qiumei et al. Excellent energy storage performance of K0.5Bi0.5TiO3-based ferroelectric ceramics under low electric field [J]. | CHEMICAL ENGINEERING JOURNAL , 2021 , 414 . |
| MLA | Yang, Qian et al. "Excellent energy storage performance of K0.5Bi0.5TiO3-based ferroelectric ceramics under low electric field" . | CHEMICAL ENGINEERING JOURNAL 414 (2021) . |
| APA | Yang, Qian , Zhu, Mankang , Wei, Qiumei , Zhang, Manlin , Zheng, Mupeng , Hou, Yudong . Excellent energy storage performance of K0.5Bi0.5TiO3-based ferroelectric ceramics under low electric field . | CHEMICAL ENGINEERING JOURNAL , 2021 , 414 . |
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摘要 ：
Piezoelectric energy harvesters (PEHs) with piezoceramics as the core can convert low-frequency vibration energy that is ubiquitous in the environment into electrical energy and are at the frontier of research in the field of energy. The high piezoelectric charge coefficient (d) together with the large piezoelectric voltage coefficient (g) are essential for enhancing the energy harvesting performances of PEHs working on a nonresonant state. However, conventional doping and solid solution design strategies lead to the same increase or decrease trend of d and dielectric permittivity ε, making it difficult to obtain a high g value because g = d/ε. Herein, exceptionally well-balanced performances of high d and large g are achieved simultaneously in modified Pb(Zr, Ti)O3(PZT)-based ceramics via a multiscale heterogeneity strategy, which involves coordination among the defect dipole, hierarchical domain, and composite. The electromechanical parameters of the optimal specimen are not only superior to those of many state-of-the-art commercial counterparts but also exhibit good thermal stability. Most importantly, the assembled PEH with the optimal specimen shows excellent variable temperature power generation characteristics. This work provides a paradigm for building PEH material through a multiscale heterogeneity strategy, expected to benefit a wide range of electromechanical coupling materials.
关键词 ：
composite composite defect dipole defect dipole domain configuration domain configuration piezoceramics piezoceramics piezoelectricity piezoelectricity
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| GB/T 7714 | Yu Xiaole , Hou Yudong , Zheng Mupeng et al. Multiscale Heterogeneity Strategy in Piezoceramics for Enhanced Energy Harvesting Performances. [J]. | ACS applied materials & interfaces , 2021 , 13 (15) : 17800-17808 . |
| MLA | Yu Xiaole et al. "Multiscale Heterogeneity Strategy in Piezoceramics for Enhanced Energy Harvesting Performances." . | ACS applied materials & interfaces 13 . 15 (2021) : 17800-17808 . |
| APA | Yu Xiaole , Hou Yudong , Zheng Mupeng , Zhu Mankang . Multiscale Heterogeneity Strategy in Piezoceramics for Enhanced Energy Harvesting Performances. . | ACS applied materials & interfaces , 2021 , 13 (15) , 17800-17808 . |
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摘要 ：
Taking the advantage of the low transition barrier between P4bm and P4mm distortions, tetragonal structured 0.875Bi(0.5)Na(0.5)TiO(3)-0.125BaTiO(3) was designed to construct an electrocaloric ceramics with large electrocaloric strength by adding the third compound Bi(Mg0.5Ti0.5)O-3 (BMT). The experiments show that, through adding 2.5 mol.% BMT, a large Delta T of 0.80 K was directly observed under 4 kV/mm; especially, a high Delta T/Delta E of 0.020-0.023 K cm/kV was achieved, approximate to BaTiO3-based and some lead-based relaxors. The high electrocaloric effect is attributed to that the 2.5 mol.% BMT added sample bridges the nonergodic ferroelectric and ergodic relaxor states, and exhibits a microstructure coexisting P4bm and P4mm symmetries. Our design provides a new route in probing lead-free BNT-based electrocaloric materials apart from the MPB. (C) 2021 Elsevier B.V. All rights reserved.
关键词 ：
Bismuth sodium titanate Bismuth sodium titanate Dynamics of polar nanoregions Dynamics of polar nanoregions Electrocaloric effect Electrocaloric effect Ferroelectric-to-relaxor transition Ferroelectric-to-relaxor transition Tetragonal distortion Tetragonal distortion
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| GB/T 7714 | Zhu, Mankang , Yan, Xiaofen , Wei, Qiumei et al. Large electrocaloric strength in Bi(Mg0.5Ti0.5)O-3-modified tetragonal- structured Bi0.5Na0.5TiO3-12.5BaTiO(3) ceramics [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 889 . |
| MLA | Zhu, Mankang et al. "Large electrocaloric strength in Bi(Mg0.5Ti0.5)O-3-modified tetragonal- structured Bi0.5Na0.5TiO3-12.5BaTiO(3) ceramics" . | JOURNAL OF ALLOYS AND COMPOUNDS 889 (2021) . |
| APA | Zhu, Mankang , Yan, Xiaofen , Wei, Qiumei , Zheng, Mupeng , Hou, Yudong , Ke, Xiaoxing et al. Large electrocaloric strength in Bi(Mg0.5Ti0.5)O-3-modified tetragonal- structured Bi0.5Na0.5TiO3-12.5BaTiO(3) ceramics . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 889 . |
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摘要 ：
By maintaining high piezoelectric coefficients (d33), increasing the depolarization temperature is the key to constructing high-performance high-temperature piezoceramics. Unfortunately, so far, no piezoceramic has been found that still has ad33value above 700 pC N−1byin situtesting at a high-temperature of 400 °C. For popular 0.36BiScO3-0.64PbTiO3ceramics with a MPB structure, thein situquasi-staticd33value at 400 °C is only 405 pC N−1. Herein, a new strategy to enhance perovskite lattice distortion to obtain oxides with excellent high-temperature piezoelectricity has been proposed. By introducing Bi(Zn0.5Hf0.5)O3to enhance lattice distortion of a (1 −x)BiScO3-xPbTiO3matrix, a ternary systemzBiScO3-xPbTiO3-yBi(Zn0.5Hf0.5)O3(zBS-xPT-yBZH) was designed. A record-highin situquasi-staticd33value of 726 pC N−1at 400 °C is achieved in a 0.355BS-0.635PT-0.01BZH composition. Structural analysis confirmed that the introduction of highly tetragonal Bi(Zn0.5Hf0.5)O3can enhance the lattice distortion and the sample annealed at 400 °C still maintains a stable domain configuration. Moreover, a high-temperature piezoelectric energy harvester is manufactured from the optimal material, and exhibits excellent high-temperature power generation capacity, and a 10 μF commercial electrolytic capacitor can be easily charged to 0.9 V in 40 s at 400 °C. This work demonstrates thatzBS-xPT-yBZH ceramics have great potential for application in extreme high temperature environments, and pave the way for obtaining high-quality high-temperature piezoelectric materials. © The Royal Society of Chemistry 2021.
关键词 ：
Crystallography Crystallography Electrolytic capacitors Electrolytic capacitors Energy harvesting Energy harvesting Perovskite Perovskite Piezoelectric ceramics Piezoelectric ceramics Piezoelectric devices Piezoelectric devices Piezoelectricity Piezoelectricity
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| GB/T 7714 | Zhao, Haiyan , Hou, Yudong , Yu, Xiaole et al. Giant high-temperature piezoelectricity in perovskite oxides for vibration energy harvesting [J]. | Journal of Materials Chemistry A , 2021 , 9 (4) : 2284-2291 . |
| MLA | Zhao, Haiyan et al. "Giant high-temperature piezoelectricity in perovskite oxides for vibration energy harvesting" . | Journal of Materials Chemistry A 9 . 4 (2021) : 2284-2291 . |
| APA | Zhao, Haiyan , Hou, Yudong , Yu, Xiaole , Zheng, Mupeng , Zhu, Mankang . Giant high-temperature piezoelectricity in perovskite oxides for vibration energy harvesting . | Journal of Materials Chemistry A , 2021 , 9 (4) , 2284-2291 . |
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摘要 ：
Due to the self-supplied energy requirements of wearable electronic devices, flexible piezoelectric energy harvesters (FPEHs) that can convert the vibration energy in the environment into electrical energy have received widespread attention in recent years. The key to increasing the power generation capacity of FPEHs is to increase the piezoelectric charge constant d(33) while reducing the internal resistance, which is still a huge challenge for ceramic/polymer composites. In this work, a synergistic effect is used to construct FPEHs with high power generating capacity. On the one hand, a highly electroactive 0.2Pb(Zn1/3Nb2/3)O-3-0.8Pb(Zr1/2Ti1/2)O-3 (PZN-PZT) ceramic skeleton is constructed through a freeze-casting method to greatly increase the d(33) of a PDMS based composite. On the other hand, multi-walled carbon nanotubes (MW-CNTs) are introduced as a bridging phase to reduce the internal resistance of the composite. The 2-2 type PZN-PZT/MW-CNTs/PDMS piezocomposite prepared using this strategy has a d(33) as high as 144 pC N-1, which is significantly better than those of previously reported composites. The FPEH with dimensions of 1.5 x 1.5 x 0.1 cm(3) can light 22 LEDs through the rectifier circuit without any storage units, showing an important application prospect for self-supply of energy in wearable electronic devices.
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| GB/T 7714 | Hao, Yijin , Hou, Yudong , Xu, Hui et al. Enhancing the energy harvesting performance of PDMS based piezocomposites via a synergistic effect [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2021 , 9 (40) : 14303-14308 . |
| MLA | Hao, Yijin et al. "Enhancing the energy harvesting performance of PDMS based piezocomposites via a synergistic effect" . | JOURNAL OF MATERIALS CHEMISTRY C 9 . 40 (2021) : 14303-14308 . |
| APA | Hao, Yijin , Hou, Yudong , Xu, Hui , Gao, Xin , Zheng, Mupeng , Zhu, Mankang . Enhancing the energy harvesting performance of PDMS based piezocomposites via a synergistic effect . | JOURNAL OF MATERIALS CHEMISTRY C , 2021 , 9 (40) , 14303-14308 . |
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