MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Xiaoting Zhang,Bin Cui,Yu Qiu,Rong Ma,Yueyao Fan
In this paper, morphology engineering was developed to optimize the overall temperature-stable energy storage performance of ceramic capacitors. First, SrSn 0.1 Ti 0.9 O 3 (SST) particles were coated on Na 0.5 Bi 0.5 TiO 3 (NBT) rods to form "core-shell" NBT@SST rods by a co-precipitation method to improve the relaxor behavior. And the rods were compounded with the Bi 2 O 3 -B 2 O 3 -SiO 2 (BBS) glass to dense into NBT@SST-BBS composites. The nanorods morphology of ceramic grains can increase the charge storage sites to induce higher polarization value. The moderate- ε r SST shell with highly lattice matching could lower the interfacial polarization between ceramic and glass phase so as to boost the breakdown strength. Comparatively, composites with nanorod morphology can reach the highest recoverable energy density of 2.19 J/cm 3 at 229 kV/cm with superior temperature stability ( Δε/ε 150 ° C ≤ 15% at 30–395 °C). We hope this work will give guidance to fabricate the next-generation dielectric capacitors through morphology engineering.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Dezhao Meng,Fukang Chen,Xinyu Chen,Lishun Yang,Xing Zhao,Can Tian,Yuan Zhou,Li Jin,Vladimir Laletin,Chunlin Song,Yan Yan,Gang Liu
Ceramic materials with relaxor dielectric properties , expressed as (1- x )(0.94Na 0.5 Bi 0.5 TiO 3 -0.06LiTaO 3 )- x CaTiO 3 [(1- x )(NBT-LT)- x CT] with x values of 0.12, 0.15, 0.18, and 0.21, were synthesized through an A-site doping method to enhance energy storage capabilities. The linear dielectric CaTiO 3 was chosen as the acceptor additive, and ceramic samples were prepared using conventional solid-phase and molding techniques. A comprehensive investigation evaluated the influence of different CT concentrations on the phase and energy storage/release characteristics of NBT-LT. Optimal performance was notably achieved with a 15% CT doping concentration, resulting in W rec and η values of 2.16 J/cm³ and 70%, respectively, for a 100 μm thick sample under a 210 kV/cm voltage. When the film was rolled to a 60 μm thickness, the voltage strength increased to 330 kV/cm, leading to enhanced W rec (5.33 J/cm³) and η (80%). Within the temperature range of 30 °C to 150 °C, only a marginal change in W rec (less than 10%) was observed. Frequency conversion tests across the 1 Hz to 100 Hz range demonstrated the material's relative stability, with W rec exhibiting minimal fluctuations. These findings emphasize the outstanding temperature and frequency stability of the material. During discharge, the material displayed a power density of up to 152 MW/cm³, coupled with a discharge time of 0.3 μs, showcasing remarkable pulse discharge capabilities. The experimental results affirm the promising potential of (NBT-LT)-0.15CT lead-free relaxor ferroelectric ceramics for application in commercial capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Lizhen Lu,Haoyu Zhang,Jinghui Wang,Haolin Wang,Qian Chen,Jinbo Xue,Qianqian Shen,Chunliang Zhou,Jian Ku Shang,Qi Li
A ferroelectric ceramic material of Na 0.5 Bi 0.5 TiO 3 was found to possess a pronounced, long-lasting, and fast-switchable photochromic behavior responsive to visible light. The working mechanism of its photochromism could be attributed to an interesting photocatalytic memory effect , during which photogenerated electrons were trapped by Bi 3+ /Ti 4+ and oxygen vacancies generated in Na 0.5 Bi 0.5 TiO 3 . The release kinetics of trapped electrons could be modulated by controlling environment conditions to make its photochromism phenomenon both long-lasting and fast-switchable to meet various application requirements. In the meantime, the photochromism process changed its inner electronic structure, resulting in stronger oxidation capability, increased piezoelectric response, improved charge carrier separation and transfer, and more active oxygen species production. Thus, its photocatalytic, piezocatalytic and photopiezocatalytic performances were all significantly enhanced as demonstrated by its TC-HCl degradation performances. This work offered a novel approach to search for and design inorganic photochromic materials with good reversibility for various technical applications.
研究领域:
材料科学
·
光催化
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Ying Zhang,Meng-Han Yan,Zhi-Fei Zhang,Hai-Rui Bai,Peng Li,Wei-Fang Han,Ji-Gong Hao,Wei Li,Yu-Chao Li,Chun-Ming Wang,Peng Fu
The increase in energy consumption and its collateral damage on the environment has encouraged the development of environment-friendly ceramic materials with good energy storage properties. In this work, (1– x )Na 0.5 Bi 0.5 TiO 3 - x Ca(Mg 1/3 Nb 2/3 )O 3 ceramics were synthesized by the solid-state reaction method. The 0.88Na 0.5 Bi 0.5 TiO 3 -0.12Ca(Mg 1/3 Nb 2/3 )O 3 ceramic exhibited a high recoverable energy storage density of 8.1 J/cm 3 and energy storage efficiency of 82.4% at 550 kV/cm. The introduction of Ca(Mg 1/3 Nb 2/3 )O 3 reduced the grain size and increased the band gap, thereby enhancing the breakdown field strength of the ceramic materials. The method also resulted in good temperature stability (20–140 °C), frequency stability (1–200 Hz), and fatigue stability over 10 6 cycles. In addition, an ultrahigh power density of 187 MW/cm 3 and a fast charge-discharge rate ( t 0.9 = 57.2 ns) can be obtained simultaneously. Finite element method analysis revealed that the decrease of grain size was beneficial to the increase of breakdown field strength. Therefore, the 0.88Na 0.5 Bi 0.5 TiO 3 -0.12Ca(Mg 1/3 Nb 2/3 )O 3 ceramics resulted in high energy storage properties with good stability and were promising environment-friendly materials for advanced pulsed power systems applications.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kun Yu,Xing Zhao,Jingwen Lv,Xinyu Liu,Yan Yan,Wei Cai,Hua Tan,Haibo Zhang,Gang Liu
Dielectric ceramic capacitors are candidates for a new generation of pulsed power supplies, owing to their superior power density. Nevertheless, low energy storage density and poor working reliability (such as temperature stability and fatigue resistance) have hindered the wide application of dielectric ceramic capacitors. To this end, a new composition-based optimization and process improvement strategy is proposed to build relaxor ferroelectric ceramic systems with weak pinning effect domain structure, which not only ensure the performance of ceramic energy storage, but also take into account the reliability of actual work. In this study, lead-free ceramics with formula 0.75(0.94Na 0.5 Bi 0.5 TiO 3 -0.06BaTiO 3 )-0.25CaTiO 3 , prepared by viscous polymer processing, exhibit an extremely high energy storage density, reaching up to 6.62 J/cm 3 under a field strength of 520 kV/cm. In addition, after 10 6 cycles at 200 kV/cm, the efficiency remains at 85.9 %, with the sample's energy storage density exhibits a change rate of only 4 %. Additionally, under 300 kV/cm and across a temperature range of 30–150 °C, the change rate is a mere 1.7 %, which indicates that it has exhibited great fatigue resistance and excellent temperature stability. Therefore, this developed ceramic possesses great potential for practical industrial application as dielectric capacitors.
研究领域:
材料科学
·
电子工程
✓ 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）