Journal of Materials Chemistry C
·
2025
·
IF 5.1
Shuo Zhang,Hua Hao,Rui Huang,Minghe Cao,Zhonghua Yao,Hanxing Liu
Electronic power systems require the development of dielectric capacitors that combine high energy storage density and high efficiency. However, there are some unavoidable defects such as oxygen vacancies in dielectrics, which seriously deteriorate the energy storage performance. Here, a bidirectional design of defect engineering and heterogeneous interfacial construction is conducted in Fe-doped 0.8Bi0.5Na0.5TiO3–0.2Bi3.25La0.75Ti3O12 relaxor ferroelectric films to reduce leakage current and improve polarization. Simultaneously, the heterogeneous interfacial construction hinders the mass transfer process and forms more interfaces, which impede the formation of electronic pathways. The synergistic action of bidirectional design provides a substantial increase in breakdown strength, combined with excellent dielectric properties and high temperature, frequency and cycle stability. Finally, a great balance between energy storage density (83.6 J cm−3) and efficiency (74.1%) is achieved for 2 mol% Fe-doped films. This work provides a strategy for designing advanced electrostatic capacitors through defect and interface regulation.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 9
·3180
·
IF 3.748
Xingru Zhang,Yinan Xiao,Chao Yang,Yuandong Wu,Min Wen,Junke Jiao,Rui Li,Liyuan Sheng,Wenchang Tan
Depolarization behavior is one of the main shortcomings of (Bi0.5Na0.5)TiO3-based ceramics. Considering the undesirable efficiency of traditional modification methods, in this paper a series of 0–3 type ceramic composites 0.85(Bi0.5Na0.5)TiO3-0.11(Bi0.5K0.5)TiO3-0.04BaTiO3-xmol% ZnO (BNKT-BT-xZnO)) were synthesized by introducing ZnO nanoparticles. The results of the X-ray diffraction pattern (XRD) and energy dispersive spectroscopy (EDS) demonstrate that the majority of ZnO nanoparticles grow together to form enrichment regions, and the other Zn2+ions diffuse into the matrix after sintering. With ZnO incorporated, the ferroelectric–ergodic relaxor transition temperature,TF-R,and depolarization temperature,Td,increase to above 120 °C and 110 °C, respectively. The research on temperature-dependentP–Eloops verifies an attenuated ergodic degree induced by ZnO incorporation. For this reason, piezoelectric properties can be well-maintained below 110 °C. The electron backscatter diffraction (EBSD) was employed to investigate the stress effect. Orientation maps reveal the random orientation of all grains, excluding the impact of texture on depolarization. The local misorientation image shows that more pronounced strain appears near the boundaries, implying stress is more concentrated there. This phenomenon supports the hypothesis that potential stress suppresses depolarization. These results demonstrate that the depolarization behavior is significantly improved by the introduction of ZnO. The composites BNKT-BT-xZnO are promising candidates of lead-free ceramics for practical application in the future.Keywords:BNT-based ceramic composite;depolarization behavior;electric properties;stress;ZnO incorporation
研究领域:
材料科学
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物理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2012
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IF 4.951
Yingying Hu,Zhaoyin Wen,Xiangwei Wu,Jun Jin
Porous carbon films with tunable pore structure to modify the β″-alumina electrolyte surface are fabricated through a low-cost and direct wet chemistry method with glucose and poly(methyl-methacrylate) (PMMA) as precursors. FTIR analysis confirms the effective connection between the carbohydrate and the pore-forming agent PMMA through hydrogen bonds . The experimental results indicate that the structural parameters of the porous carbon films, including mean pore size and film thickness, can be tuned simply by adjusting the amount of PMMA in the glucose/PMMA composite. This soft-template-assisted method could be readily extended to modify any other ceramic surfaces. The porous carbon films are demonstrated to greatly improve the wettability of the β″-alumina ceramics by molten sodium . Na/β″-alumina/Na cells are used to investigate the interfacial properties between sodium and the β″-alumina electrolyte. The results obtained at 350 °C reveal that the polarization behavior of the cell is alleviated by the porous coating . This work represents a successful method to coat ceramics with porous carbon and offers a promising solution to overcome the polarization problems of the sodium/β″-alumina interface in Na-based batteries .
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·E401
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IF 3.12
Handong Jiao,Shuqiang Jiao,Wei-Li Song,Haosen Chen,Mingyong Wang,Jiguo Tu,Daining Fang
Owing to the low-cost and fast process, molten salt electrolysis is considered as a novel method to replace the Kroll process for preparing titanium. However, this process has not been fully realized because of the multi-step reduction and complicated disproportionation behaviors of multivalent titanium ions in melt. To address such critical problems, here we use liquid metals (Sn and Pb) as the cathode instead of solid metal cathode (Mo) during the electrolysis, in which the reduction process of Ti3+ (TiF63−) becomes a simple one-step process (Ti3+ + 3e = Ti (alloys)). Also, the deposition potential is more positive (>0.5 V) than that using solid Mo, owing to the depolarizing effect of the liquid metals. One-step process and depolarization behavior are favorable to increase the current efficiency, effectively decreasing the power consumption in comparison with the conventional electrolysis at solid metal cathodes. Similar to the electrolytic production of aluminum in Hall-Heroult system, there would be a continuous electrolysis process because the product is liquid alloy in this system.
研究领域:
材料科学
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电化学工程
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2023
·
IF 5.1
Wenchao Zhang,Min Jiang,Feng Guan,Shiyu Liu,Liangjun Wang,Yanpeng Li,Dong Yue,Jialong Li,Xiaoxu Liu,Yu Feng
High-performance polymer dielectrics are critical for high-tech fields such as electrical insulation and aerospace. Nevertheless, it is still challenging to achieve simultaneous improvements in both dielectric constant and breakdown strength in polymer dielectrics. In this work, Al 3+ substitution Si 4+ in SiO 2 by high-temperature sintering to create hole traps to obtain the acceptor-doped fillers Si 1-0.75x Al x O 2 (SA (x mol%)), and polyimide (PI) dielectric containing SA fillers with different contents were synthesized using in-situ polymerization. The hole traps in the fillers modulate the electrical behavior of the polymer dielectric, thereby significantly increasing the dielectric constant and breakdown strength by modulating the polarization behavior and capture carriers. Among them, the dielectric constant of the 1.25 vol% SA (1.5 mol%)/PI composite was increased to 3.60 at 1 Hz, and the breakdown strength E b reached 581.5 kV/mm. This work provides a new synthesis strategy for simultaneously achieving high insulation and high polarization of polymer dielectric.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 23
·13143-13153
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IF 3.43
Pu Mao,Jiping Wang,Lixue Zhang,Qinzhao Sun,Xixia Liu,Liqiang He,Shujuan Liu,Siwen Zhang,Hao Gong
Polymer dielectrics with high dielectric performances and superior discharge energy capability are highly desirable for advanced electrostatic capacitor applications. However, the paradoxical relationship between dielectric polarization and electric breakdown behavior generally hinder their further enhancement in energy storage performances. Herein, polymer blended composite films with high energy storage capability were successfully fabricated by blending together poly(vinylidene fluoride) (PVDF) polymer and poly(vinylidene fluoride–trifluoroethylene–chlorofluoroethylene) (P(VDF–TrFE–CFE)) terpolymer. The P(VDF–TrFE–CFE) terpolymer has a high dielectric constant to provide a large electric displacement under an applied electric field far below its breakdown field, which is anticipated to modulate the dielectric polarization behavior of PVDF polymer when blended in different proportions. Consequently, the polymer blended composite film consisting of 20 wt% (P(VDF–TrFE–CFE)) terpolymer exhibits a high discharge energy density of 13.63 J cm−3 at an enhanced breakdown strength of 480 MV m−1. This obtained high discharge energy density is 84% higher than the pure PVDF film and 582% higher than a commercialized biaxially oriented polypropylene (BOPP). Large interfacial polarization and strong interaction of polymer chains between the PVDF polymer and P(VDF–TrFE–CFE) terpolymer may contribute to the tunable dielectric constant and electric breakdown strength, thus promoting the energy storage capability. This work establishes a facile, but effective approach to achieve the high energy storage capability of PVDF polymer-based flexible composite films for capacitive energy storage applications.
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 16
·1-12
·
IF 2.8
Wang Huiya,Zhang Kaina,Zhu Yaofeng
Anion-doped induced vacancy engineering is an effective approach to modulate polarization behavior and enhance the microwave absorption property. Herein, bamboo leaf-like polyaniline-mediated nitrogen and sulfur co-doped carbon (N/S–B–C) nanoflakes were demonstrated and successfully prepared by in-situ polymerization method and carbonization process with oxygen limitation. The hollow N/S–B–C nanoflakes are decorated by orderly aligned nanorods on the surface, which effectively balances the intrinsic high conductivity and strong polarization behavior of carbon material. The substitution of heterogeneous atoms disrupts the symmetry of local microstructures, leading to the dipolar resonances and/or vibration for enhancing dielectric loss. The N/S–B–C nanoflakes possess the minimum reflection loss ( RL min ) of − 53.5 dB at 10.2 GHz and corresponding effective absorption band (EAB) of 4.5 GHz at 2.9 mm. When the thickness is only 2.22 mm, the widest EAB is up to 5.15 GHz ranging from 12.30 to 17.40 GHz. This outstanding conductivity loss and interfacial polarization relaxation as well as the improved impedance matching from hollow structure synergistically determine excellent microwave absorption performance. This study provides an effective strategy for exploring the underlying relations between conduction loss and polarization behaviors in graphitized carbon.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2025
·
IF 9.3
Liang Yan,Yujing Zhang,Yilin Zhang,Pan Ying,Chuyang Liu,Jie Jiang,Xiaopeng Li,Dong-Hyun Kim,Zhi Zhang,Feng Xu,Zhihui Zeng
The polarization effect has been unequivocally demonstrated to markedly enhance the microwave absorption performance. However, the pursuit of achieving broadband absorption through meticulously designed polarization behavior continues to pose a formidable challenge. In this work, we present a unique multi-polarization strategy in the La(OH) 3 /N-doped rGO composites, incorporating dipole polarization induced by nitrogen doping and intrinsic defects, homogeneous interfacial polarization contributed by locally crystalized nano-domains in La(OH) 3 , and heterogeneous interfacial polarization at the heterojunctions between La(OH) 3 and N-doped rGO, to significantly enhance the multi-band polarization loss. Experimental and theoretical investigations reveal that the La(OH) 3 /N-doped rGO hybrid featuring distinctive crystalline/amorphous nano-domains exhibits remarkable coupling effects, encompassing an enhanced electron transport rate and strengthened interfacial electron interactions. The improved electron transport is attributed to increased electron transitions at heterojunctions with matched Fermi levels and enhanced charge conduction from the crystalline regions within La(OH) 3 . Furthermore, strong polarization relaxation at these heterojunction interfaces, along with weaker but significant polarization at numerous homogeneous interfaces, contributes to the enhanced interactions. Consequently, an exceptional minimal reflection loss of -69.6 dB has been achieved, accompanied by an impressive effective absorption bandwidth of 7.7 GHz, which surpasses that of the current state-of-the-art microwave absorbers. This work unveils an innovative design paradigm aimed at the meticulous regulation of polarization loss, thereby laying a robust foundation for the advancement of high-performance absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
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