MODERN PHYSICS LETTERS B
·
2020
·
IF 1.224
Hetian Xia,Yu Zhao,Weili Li,Ruixuan Song,Yulei Zhang,Weidong Fei
Herein, we report the fabrication of UV-active NaNbO 3 /Al 2 O 3 (30 wt.%) ferroelectric heterojunction photocatalyst with enhanced photoelectrochemical activity to Methylene Blue (MB). Pure NaNbO 3 nanorods (NRs) were synthesized by a facile hydrothermal process and NaNbO 3 /Al 2 O 3 composite was prepared by an ultrasonic vibration method. The heterostructures showed a remarkable increase in photocurrent density and the MB degradation ratio reached 88% in the initial 15 min and eventually reached 98.6% in 75 min. The high photocatalytic efficiency is attributed to the ferroelectric polarization of NaNbO 3 with the forming of heterojunction electric fields assisted by Al 2 O 3 . These properties demonstrate that NaNbO 3 /Al 2 O 3 ferroelectric heterojunction photocatalyst shows promising photoactivity and provides an effective method to improve the photocatalytic properties of other ferroelectrics.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JAPANESE JOURNAL OF APPLIED PHYSICS
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2025
·Vol. 64
·期 5
·051002
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IF 1.8
Han Zheng,Dongxu Pan,Ling Zhang,Zhengfa Li,Jinping Li,Zhirong Guo
The design of high-performance dielectrics is critical for next-generation capacitors and electronic devices. Herein, (1-x)NaNbO3-xNdFeO3 bulk ceramics were synthesized to investigate the effects of Nd3+/Fe3+ substitution on their dielectric and energy-storage properties. It is revealed that the narrow single polarization–electric field (P–E) loop evolved from double loops to enhance energy-storage performances with increasing x. The maximal recoverable energy-storage density of 1.673 J cm−3 and the efficiency of 76.7% were obtained at x = 0.06 and 0.08, respectively. Moreover, a negative relative permittivity in specific frequency ranges was the answer for the oscillation of domain walls. These results not only suggest that the substitution of Nd3+/Fe3+ optimizes the energy-storage properties of NaNbO3-based ceramics, but also provides a feasible strategy for functional design in electromagnetic metamaterials.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Materials Horizons
·
2021
·Vol. 9
·期 3
·1002-1009
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IF 13.266
Lu Wang,He Qi,Botao Gao,Ye Liu,Hui Liu,Jun Chen
The development of high-performance lead-free piezoceramics for replacing Pb-based perovskites has attracted lots of attention, and comparable room-temperature piezoresponse has been realized in (Na,K)NbO3 and BaTiO3-based ceramics with local structure heterogeneity via adjusting polymorphic phase boundary. In this work, a new method of oxygen octahedron tilt design is used in NaNbO3-based lead-free ceramics, which usually shows complex oxygen octahedron tilt information inherited from NaNbO3. The substitution of Ba(Fe0.5Nb0.5)O3 and BaTiO3 with high tolerance factor into NaNbO3 leads to a gradual elimination of anti-parallel cation displacement and anti-phase tilt along the three axes; as a result, a single tetragonal phase with P4bm space group and only in-phase tilt along c axis is achieved in 0.88NaNbO3–0.04Ba(Fe0.5Nb0.5)O3–0.08BaTiO3 ceramic. Accompanying the decreased oxygen octahedral tilt degree, a drastically improved d33 up to 367 pC N−1 (over ten times that of NaNbO3 ceramic) is obtained, reaching a record high in NaNbO3-based lead-free ceramics. Together with temperature insensitive piezoresponse originating from thermally stable oxygen octahedral tilt structure, the studied NaNbO3-based materials show large potential for replacing Pb-based ceramics in some electronic devices. The oxygen octahedron tilt engineering would be used for designing more high-performance lead-free ceramics with high piezoresponse and excellent thermal stability simultaneously.
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2024
·Vol. 107
·期 9
·6215-6223
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IF 3.5
Ye Lu,Ji Zhang,Xinyi Zhao,Kedong Zhou,Lei He
Dielectric capacitors, which can achieve tremendous power density and ultrafast charge/discharge speed, are crucial components for high power equipment. Yet, the synchronous achievement in high recoverable energy density ( W rec ) and high efficiency ( η ) is a long-term difficulty for dielectric ceramics. Herein, the (0.85 − x )NaNbO 3 –0.15BaTiO 3 – x Bi(Mg 1/3 Ta 2/3 )O 3 (NN–BT– x BMT) relaxor ferroelectric ceramics were proposed and studied. The doping of BMT was conducive to promoting the microstructure and bandgap and improving the dielectric relaxation properties of NN–BT ceramics. Finally, the sample of x = 0.10 presented a high W rec of 5.9 J/cm 3 and a high η of 90% simultaneously. In addition, the sample also exhibited superb charge/discharge performances with large power density ( P D = 137 MW/cm 3 ) and fast charge/discharge speed ( t 0.9 = 39 ns). The above results reveal that the NaNbO 3 -based ceramics could serve as potential alternatives for advanced dielectric capacitors.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
NANOTECHNOLOGY
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2024
·Vol. 35
·期 19
·195605
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IF 2.9
Shuo Wang,Haotian Yin,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic reduction of carbon dioxide is a technology that effectively utilizes CO2 and solar energy. Sodium niobate (NaNbO3) has received much attention in the field of photocatalysis due to its excellent photocatalytic properties. However, the application of NaNbO3 in the field of photocatalysis is still limited by poor reaction to visible light and easy recombination of photo-generated carriers. Heterojunction with g-C3N4 to construct core–shell structure can effectively improve the above problems. Combining the two can design a core–shell composite material that is beneficial for photocatalytic reduction of CO2. Herein, we prepared a core–shell heterojunction g-C3N4/NaNbO3 by uniformly impregnating urea on the surface of NaNbO3 chromium nanofibers with NaNbO3 nanofibers prepared by electrospinning as a catalyst carrier, and urea as a precursor of g-C3N4. The core–shell structure of g-C3N4/NaNbO3 was verified by a series of characterization methods such as XPS, XRD, and TEM. It was found that under the same conditions, the methanol yield of core–shell g-C3N4/NaNbO3 was 12.86 μmol·g−1·h−1, which is twice that of pure NaNbO3 (6.67 μmol·g−1·h−1). This article highlights an impregnation method to build core–shell structures for improved photocatalytic reduction of CO2.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 4
·2367-2374
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IF 11.301
Lu Wang,Shengdong Sun,Huajie Luo,Yang Ren,Hui Liu,Xianran Xing,Jun Chen
The realization of high piezoelectric performance and excellent temperature stability simultaneously in Pb-free ceramics is the key for replacing Pb-containing perovskites in the industry. In this study, large piezoelectric performance (d33 = 354 pC N−1) was achieved in a wide temperature sinterable potassium-free NaNbO3–BaTiO3–BaSnO3 system, which is twice more than the piezoelectricity found in NaNbO3–BaTiO3 binary ceramics. Structural refinement of high-energy synchrotron powder diffraction data suggests a single tetragonal structure with P4bm symmetry for the studied NaNbO3-based Pb-free ceramic. The results indicate that the small axial ratio favoring polarization reorientation benefits strong piezoelectricity, while the large oxygen octahedron tilt enhances the stability of the P4bm structure during the changing temperature according to the in situ high-energy synchrotron X-ray diffraction measurements and provides the foundation for the excellent thermal stability (20–100 °C) of the piezoelectric properties. A single tetragonal phase with a tiny axial ratio and large oxygen octahedron tilt effectively balances the piezoelectricity and thermal stability in Pb-free systems.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
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IF 3.45
Wei Li,Xiang Xia,Jiangtao Zeng,Liaoying Zheng,Guorong Li
NaNbO 3 (NN)-based solid solutions show potential applications in energy storage capacitors, strain actuators, and electrocaloric cooling devices. However, NN ceramics with distinct structures, which are prepared using various Nb 2 O 5 precursors, have not been studied. In this work, two types of Nb 2 O 5 precursors were used, including coexisting orthorhombic and monoclinic phases (denoted as OM), and single orthorhombic phase (denoted as O). Phase structure, grain morphology, sintering characteristics, ferroelectric performance, dielectric properties , and thermal-expansion properties were systematically investigated. Rietveld refinement of XRD data revealed that synthesized and sintered samples showed different phase structures. The content of ferroelectric phase (Q phase, space group P2 1 ma) was 82.7% in synthesized NN-OM, whereas it was only 73.2% in synthesized NN-O; it was 33.8% in sintered NN-OM, while it was 18.6% in sintered NN-O. Raman spectra verified that the Q phase in NN-OM was more than that in NN-O. Curie temperature ( T c ) of NN-OM was 363 °C, whereas T c of NN-O was only 352 °C. Furthermore, compared with NN-O, NN-OM showed an inhomogeneous grain size distribution, lower optimum sintering temperature , higher phase transition temperature, stronger ferroelectric performance, and larger thermal-expansion displacement. Therefore, crystal structure of Nb 2 O 5 has a great influence on the structure and performances of NN ceramics.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
MATERIALS LETTERS
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2021
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IF 3.423
Heming Ji,Jiale Tang,Xunze Tang,Zhe Yang,Haiyan Zhang,Yannan Qian
The rod-like NaNbO 3 :Er 3+ /Yb 3+ nanocrystals codoped with Mg 2+ ions were firstly synthesized by hydrothermal method. The effect of Mg 2+ ions on the phase structure and morphology of NaNbO 3 :Er 3+ /Yb 3+ was investigated by XRD and SEM spectra. Addition of Mg 2+ ions enhanced the intensities of green and red UC emissions by about 3 times and prolonged the lifetime of the 4 S 3/2 → 4 I 15/2 transition of Er 3+ ions. The pump power dependences were measured to understand the upconversion mechanism under 980 nm excitation. The tailored local environment of Er 3+ ions by codoping Mg 2+ ions was responsible for the improved optical characteristics of NaNbO 3 :Er 3+ /Yb 3+ /Mg 2+ nanocrystals.
研究领域:
材料科学
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光学
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DOI
高影响因子
Nano Energy
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2017
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IF 12.343
Zhongbin Pan,Baihui Liu,Jiwei Zhai,Lingmin Yao,Ke Yang,Bo Shen
Polymer-based dielectric materials with high power density, high energy density , and broad operating temperature range are critical to the development of cost-efficient and lightweight capacitors for modern high-power electrical systems. Here, NaNbO 3 (NN)/polymer composites, especially two-dimensional (2D) NN platelets, were used to create new composite films for energy storage applications for the first time. The trilayered architecture composites comprised of two outer layers of 2D NN platelets dispersed in a poly(vinylidene fluoride) (PVDF) matrix to provide high dielectric constant and a middle layer of pristine PVDF to offer high breakdown strength . The breakdown strength and energy density of the trilayered architecture composite films were improved significantly via tailoring the contents of the 2D NN platelets. The composite films with an optimized filler content illustrate a high discharge energy density of 13.5 J cm −3 at 400 MV m −1 , far more than the best commercial biaxially- oriented polypropylenes. Moreover, the composite films show a superior power density of 2.68 MW cm −3 and ultra-fast discharge speed of 0.127 μs. Finite element simulation further revealed the breakdown strength and energy density of the composite films were much enhanced compared to the corresponding single layer composite films. Therefore, the new trilayered architecture composite films can be applied as an alternative promising high-performance electrostatic capacitor material.
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
高影响因子
ACTA MATERIALIA
·
2023
·
IF 9.4
Jinfeng Lin,Yingbo Cao,Jin Qian,Guohui Li,Kun Zhu,Lihui Xu,Chukai Chen,Guanglong Ge,Cheng Shi,Yongqi Wei,Bo Shen,Jiwei Zhai
Eco-friendly NaNbO 3 (NN)-based relaxor ferroelectric ceramics with high dielectric constants cannot meet the high piezoelectric activity quality factors (FOMs: d 33 × g 33 ) requirements of electromechanically coupled devices. To solve this issue, we successfully improved the piezoelectricity of NN-based relaxor piezoceramics while reducing the dielectric constant based on microstructural tuning by virtue of the chemical design and texturing engineering. Mainly affected by the highly <001> c orientation and relaxor MPB, the obtained novel 88.5NaNbO 3 –10Ba(Ti 0.7 Sn 0.3 )O 3 –1.5NaSbO 3 texture ceramics enjoys an ultrahigh piezoelectric coefficient ( d 33 = 423 pC/N), reaching a record high in NaNbO 3 -based lead-free ceramics. Meanwhile, a large FOMs value ( d 33 × g 33 = 13.3·10 −12 m 2 /N) is successfully realized due to the suppression of the dielectric constant. More importantly, the stable phase/domain evolution also encourages excellent temperature stability for piezoelectricity and FOMs. Especially for the piezoelectricity, when the annealing temperature is < 140 °C, the d 33 of the 1.5T ceramics can be stabilized ∼ 400 pC/N. Such excellent electrical temperature stability shows more competition in the reported NN-based piezoceramics. This work not only provides a design paradigm for high-performance piezoelectric materials , but also facilitates their development in electromechanical coupling devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jitong Wang,Xinru Nie,Zhanhui Peng,Xiaoping Lei,Pengfei Liang,Zupei Yang,Xiaolian Chao
Lead-free antiferroelectric (AFE) NaNbO 3 (NN) is one of promising materials for dielectric capacitors, but the recoverable energy-storage density and efficiency get restrained owing to huge remanent polarization and limited dielectric breakdown field strength . In this work, a variety of NN based lead-free bulk (1- x )NaNbO 3 - x La(Mn 0.5 Ni 0.5 )O 3 (abbreviated as (1- x )NN- x LMN, x = 0, 0.05, 0.10, 0.15, 0.20) ceramics were designed using a solid-state synthesis method. Remarkably, an ultra-fast charge-discharge speed 47 ns and an acceptable recoverable energy-storage density W rec ~1.77 J/cm 3 with a high efficiency η = 77% were obtained under the E b of 200 kV/cm at x = 0.05. The superior energy storage performance is attributed to the regulation of domain size and voltage resistance by special ions substitution of A and B sites. This work not only proposes an efficient strategy to realize high recoverable energy-storage density and efficiency, but also provide an candidate material for application of advanced pulsed power capacitors.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xin Yan,Shuai Zhang,Liangfeng Pan,Tao Ai,Zhuo Li,Yanhui Niu
Improving the separation efficiency of photo-generated charge carriers is an important strategy to enhance the photocatalytic performance. In this paper, the NaNbO 3 /WO 3 composite photocatalyst was prepared via a hydrothermal method , which exhibited a substantial increase in photocatalytic activity through the synergetic effect of visible light irradiation and ultrasound vibration. The XRD, FT-IR, Raman, SEM, XPS , UV–vis DRS, and photoluminescence spectroscopy results indicated that a large number of WO 3 particles were tightly attached to the surface of NaNbO 3 nanowires in the NaNbO 3 /WO 3 composite catalyst. Under the piezo-photocatalysis condition, the degradation efficiency of Rhodamine B (RhB) by 5 % NaNbO 3 /WO 3 was significantly improved, reaching 73.7 % within 120 min. Meanwhile, the piezo-photocatalytic degradation efficiency of the NaNbO 3 /WO 3 composite catalyst was increased by 30.1 % compared to single photocatalysis , and the corresponding reaction rate constant (K) was 2.23 times than that of single photocatalysis. In addition, quenching tests showed that h + was the primary active species in piezo-photocatalytic process. The significant enhancement of piezo-photocatalytic performance was attributed to the piezoelectric field caused by the bending deformation of the NaNbO 3 nanowires, which was an important driving force for photo-generated charge carrier separation. Furthermore, the production of multiple redox active sites simultaneously improved the photocatalytic performance.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）