INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2024
·Vol. 2024
·期 1
·3777201
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IF 2.1
Lina Bing,Wei Wu,Zhenjiang Shen
Bi 2 O 3 -BaTiO 3 heterojunction with high photocatalysis efficiency was directly synthesized by rapid thermal processing (RTP). Bi 2 O 3 and BaTiO 3 were mixed in ratio and treated by RTP and conventional thermal processing (CTP), respectively. RTP samples have obvious Bi 2 O 3 diffraction peaks, while CTP samples show pure BaTiO 3 tetragonal perovskite. More small particles and layered existed in RTP samples. Photodegradation of MB solutions shows that RTP can promote photocatalytic efficiency. Its main lies in the following points: RTP can remove grain boundary defects by strengthening the bond grains; RTP can limit the solution region of the two substances to a certain range to get the best built-in electric field width; and RTP can strengthen the tetragonal BaTiO 3 phase to hasten ion movement. Therefore, RTP can achieve much higher photocatalytic efficiency by improving the build heterojunction. This work provides a direct and efficient route to get improvement and high performance of heterojunction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 6
·378
·
IF 5
Jun Wu,Wen Yan,Mengyuan Xie,Kai Zhong,Sheng Cui,Xiaodong Shen
Given the increasingly severe environmental problems caused by water pollution, the degradation of organic dyes can be effectively achieved through the utilization of photocatalysis. In this work, metal alkoxides and a combination of alcohol/hydrophobic solvents are employed to prepare BaTiO3aerogels via a liquid-phase and template-free synthetic route. The preparation process of the aerogels solely entails facile agitation and supercritical drying, eliminating the need for additional heat treatment. The binary solvent of ethanol and toluene is identified as the optimal choice, resulting in a significantly enhanced surface area (up to 223 m2/g) and an abundant pore structure of BaTiO3aerogels compared to that of the BaTiO3nanoparticles. Thus, the removal efficiency of the BaTiO3aerogel sample for MO is nearly twice as high as that of the BaTiO3nanoparticles sample. Noble metal Ag nanoparticles’ deposition onto the BaTiO3aerogel surface is further achieved via the photochemical deposition method, which enhances the capture of photogenerated electrons, thereby ensuring an elevated level of photocatalytic efficiency. As a result, Ag nanoparticles deposited on BaTiO3aerogel can degrade MO completely after 40 min of illumination, while the corresponding aerogel before modification can only remove 80% of MO after 60 min. The present work not only complements the preparatory investigation of intricate aerogels but also offers a fresh perspective for the development of diverse perovskite aerogels with broad applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Korean Journal of Materials Research
·
2024
·Vol. 34
·期 9
·422-431
·
IF 0.3
Shu Ye,Jing Cheng,Zeda Meng,Won-Chun Oh
Hydrothermal and ultrasonic processes were used in this study to synthesize a single-atom Cu anchored on t-BaTiO3. The resulting material effectively employs vibration energy for the piezoelectric (PE) catalytic degradation of pollutants. The phase and microstructure of the sample were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), and it was found that the sample had a tetragonal perovskite structure with uniform grain size. The nanomaterial achieved a considerable increase in tetracycline degradation rate (approximately 95 % within 7 h) when subjected to mechanical vibration. In contrast, pure BaTiO3 demonstrated a degradation rate of 56.7 %. A significant number of piezo-induced negative charge carriers, electrons, can leak out to the Cu-doped BaTiO3 interface due to Cu's exceptional conductivity. As a result, a single-atom Cu catalyst can facilitate the separation of these electrons, resulting in synergistic catalysis. By demonstrating a viable approach for improving ultrasonic and PE materials this research highlights the benefits of combining ultrasonic technology and the PE effect.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 10
·848
·
IF 4.4
Jun Wu,Gaofeng Shao,Xiaodong Wu,Sheng Cui,Xiaodong Shen
A novel Cr-doped BaTiO3aerogel was successfully synthesized using a co-gelation technique that involves two metallic alkoxides and a supercritical drying method. This freshly prepared aerogel has a high specific surface area of over 100 m2/g and exhibits improved responsiveness to the simulated sunlight spectrum. Methyl orange (MO) was chosen as the simulated pollutant, and the results reveal that the Cr-doped BaTiO3aerogel, when modified with the noble metal silver (Ag), achieves a pollutant removal rate approximately 3.2 times higher than that of the commercially available P25, reaching up to 92% within 60 min. The excellent photocatalytic performance of the Ag-modified Cr-doped BaTiO3aerogel can be primarily attributed to its extensive specific surface area and three-dimensional porous architecture. Furthermore, the incorporation of Ag nanoparticles effectively suppresses the recombination of photo-generated electrons and holes. Stability and reusability tests have confirmed the reliability of the Ag-modified Cr-doped BaTiO3aerogel. Therefore, this material emerges as a highly promising candidate for the treatment of textile wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dashuang Fu,Fang He,Haiyi Tian,Jiahao Li,Jieming Zhang,Zheng Kang,Yunkai Wu,Xu Wang
The development of lead-free dielectric capacitors with high recoverable energy storage density and high energy storage efficiency is important for improving the overall performance of electronic and power systems. BaTiO 3 (BTO) is one of the most common ferroelectric materials and has attracted much attention for energy storage applications in the past decades due to its excellent dielectric and ferroelectric properties. However, high remnant polarization and low electrical breakdown strength of BTO limit its development in energy storage applications. Many efforts (e.g., elements doping, interface/heterostructure, etc.) have been made to improve the energy storage density of BTO thin films. In this paper, Ba 1-x Ni x TiO 3 thin films (x = 0, 0.02, 0.04, 0.06, 0.08; abbreviated as BN x T) were synthesized via sol-gel and spin-coated method. The effect of Ni doping on the structural, dielectric, ferroelectric and energy storage properties of BTO thin films has been studied. The results confirmed that with the increase of Ni doping, a second phase arises and the dielectric constant decreases. While appropriate Ni doping led to the improvement of the breakdown strength, further increase of Ni deteriorated the energy storage because of the high oxygen vacancy. Finally, optimized energy storage performance was obtained for BN 0.04 T thin film: dielectric constant of 401, dielectric loss of 0.002, recoverable energy density of 20.2 J/cm 3 and energy storage efficiency of 83.6% at 965 kV/cm. Meanwhile, the remnant and maximum polarization of the films were 0.06 μC/cm 2 and 50 μC/cm 2 , respectively. BN 0.04 T thin film has an excellent application prospect and is expected to appear as a component in the future composite energy storage film system.
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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
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
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Dielectrics
·
2023
·
IF 3.1
Hailan Qin,Jianwei Zhao,Xiaoxin Chen,Hongtian Li,Shenghao Wang,Yuxiao Du,Peifeng Li,Huanfu Zhou,Dawei Wang
BiFeO 3 –BaTiO 3 is a promising lead-free piezoelectric ceramic, exhibiting high Curie temperature and superior electrochemical characteristics. In this work, ( 1 − x ) BiFeO 3 – x BaTiO 3 (BF– x BT, x = 0 . 2 6 , 0.28, 0.30, 0.32, 0.34, 0.36) ceramics were fabricated using the conventional solid-state reaction method through precise composition control. Multiple characterization techniques, including X-ray powder diffraction (XRD), scanning electron microscope (SEM), and electrical property testing systems, were applied to systematically examine the crystallographic structure, microstructure, as well as the dielectric, ferroelectric and piezoelectric properties of the BF– x BT ceramics. The XRD results confirm that all compositions exhibit a typical perovskite structure, transitioning from a single rhombohedral phase to a rhombohedral–cubic phase mixture as the BT content increases. SEM shows apparent core–shell microstructures in the ceramics. Notably, the results demonstrated that the BF–0.30BT ceramic exhibits the maximum piezoelectric constant ( d 3 3 ) ∼ 2 1 7 pC/N, while the BF–0.34BT ceramic displays the maximum converse piezoelectric constant ( d 3 3 ∗ ) ∼ 3 2 3 pm/V, which highlights the suitability of BF–BT ceramics for high-performance piezoelectric applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ziwei Zhao,Qi Ling,Ziliang Li,Kui Yan,Chunsheng Ding,Peng Chen,Lei Yang,Zhaoqi Sun,Miao Zhang
The combination of light energy and mechanical energy is thought to be an effective way to manage environmental resources and create sustainable energy. In this study, thin-film catalysts compounded with photocatalytic material TiO 2 and piezoelectric material BaTiO 3 were successfully prepared by a simple hydrothermal method on glass sheets, avoiding the possibility of secondary contamination of powder catalysts. The synergistic effect of light and ultrasound enhanced the degradation of norfloxacin by heterojunction BaTiO 3 /TiO 2 . After 60 min, the norfloxacin degradation was 91.7 % complete, with a rate constant of 43 × 10 −3 min −1 . This rate constant was 2.69 times higher than the rate constant for TiO 2 at 16 × 10 −3 min −1 . The built-in electric field generated by ultrasound is thought to improve the catalytic and optoelectronic properties of the composite by separating photogenerated electrons and holes. In addition, the stability and general usability of the composites were investigated. The effects of norfloxacin concentration, solution pH, and anions on the experiments were also analyzed. Free radical trapping experiments were conducted on the composites to identify the active species. The results showed that h + and ·OH were the main active species. In addition, it was determined that S-Scheme heterojunctions were likely involved in the catalytic process.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·3101-3110
·
IF 2.22
Ye Jian,Zhang Biao,Jin Yicheng,Zhang Haoqian,Qiao Yingjie,Zhang Zhiguo
How to obtain high dielectric constant using low filler content is one of the urgent problems to be solved in the research field of ceramic/polymer dielectric materials. In traditional methods (fillers are randomly distributed), filler particles are isolated by thick layers of polymers (with low dielectric constant), which usually result in ultra-low enhancement efficiencies of dielectric constant for the composites. To solve the above puzzle, this study provides a new strategy to improve the dielectric constant of ceramic/polymer composites, that is constructing 3D segregated architectures of BaTiO 3 (BT networks) in polystyrene (PS) matrix. This strategy is expected to enhance dielectric interaction between BT particles and greatly improve the dielectric constant of BT/PS composites. In this method, PS@BT core–shell microspheres were firstly fabricated by electrostatic self-assembling the BT particles on PS microspheres. BT/PS composites with BT networks were constructed by hot pressing above core–shell microspheres. Microstructures of PS@BT microspheres and BT/PS composites were investigated. Dielectric properties of BT/PS composites with various BT contents were studied. Results show that dielectric constant of the BT/PS composites is up to 41.8 when BT content is only 30vol%, which is much higher than that of traditional composites. This research provides us a facile method to design and fabricate ceramic/polymer composites with high dielectric constant and low loss.
研究领域:
材料科学
·
复合材料
·
介电材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Weihua Cai,Xinyu Ma,Jin Chen,Ruochen Shi,Yabo Wang,Yawei Yang,Dengwei Jing,Hudie Yuan,Jing Du,Meidan Que
Great efforts have been devoted to developing efficient visible-light-driven photocatalysts for the conversion CO 2 into clean fuels. Nevertheless, the photoreduction of CO 2 is hampered by inadequate surface-active sites and ineffective electron-hole pair separation. Herein, we explore the wheat-heading BaTiO 3 with high surface area and piezoelectricity to facilitating their bulk charge separation. Meanwhile, oxygen vacancies were fabricated to extending the visible light absorption range and increasing the active sites of the wheat-heading BaTiO 3 , thus promoting the photocatalytic performance of CO 2 . Among the wheat-heading BaTiO 3 -X (X = 0, 0.5, 1.0, 1.5, 2.0) catalysts, BaTiO 3 -1.5 affords the optimal photocatalytic performance of CO, 6.41 μmol·g −1 under light, 9.17 μmol·g −1 under light and ultrasound, which were 3.22 and 1.86 times higher for pristine wheat-heading BaTiO 3 , respectively. This synergetic strategy sheds a new light on piezoelectric properties and surface defect engineering, while emphasizing the importance of surface properties in enhancing CO 2 conversion performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 16
·2000484
·
IF 4.948
Gang Jian,Yong Jiao,Qingzhen Meng,Hui Shao,Fengwei Wang,Zhaoyu Wei
Piezoelectric nanogenerators (PENGs) with good flexibility and high outputs have promising applications in harvesting mechanical energy and powering electronics. In this study, a synthesis of hierarchical BaTiO 3 flowers (BTFs) and their filling into the polydimethylsiloxane (PDMS) matrix to obtain composites with excellent energy harvesting properties is reported. The BTF-based PENG possesses a voltage of 260 V, a current of 50 µ A, and a power of 1728 µ W under a compression of 50 N at 3.5 Hz, which output power is two orders higher than that of polymer composites filled with BT nanoparticles. Simulation indicates that the high local stress at petals of BTFs is the main reason for the enhanced performances. The PENG shows good durability under 5000 cycles and lights up 58 commercial light emitting diodes and a display. The PENG generates 30–100 V in harvesting human motions of hand slapping and foot stepping and ≈50 V in harvesting the sport kinetic energy of basketball bouncing. This research presents a BTF-based PENG with significantly enhanced energy harvesting performances for applications in micro/nanoenergy systems.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 15
·3191
·
IF 5
Yuhang Du,Gang Jian,Chen Zhang,Fengwei Wang
Piezoelectric nanogenerators have prospective uses for generating mechanical energy and powering electronic devices due to their high output and flexible behavior. In this research, the synthesis of the three-dimensional coral-like BaTiO3(CBT) and its filling into a polyvinylidene fluoride (PVDF) matrix to obtain composites with excellent energy harvesting properties are reported. The CBT-based PENG has a 163 V voltage and a 16.7 µA current at a frequency of 4 Hz with 50 N compression. Simulations show that the high local stresses in the CBT coral branch structure are the main reason for the improved performance. The piezoelectric nanogenerator showed good durability at 5000 cycles, and 50 commercial light-emitting diodes were turned on. The piezoelectric nanogenerator generates a voltage of 4.68–12 V to capture the energy generated by the ball falling from different heights and a voltage of ≈0.55 V to capture the mechanical energy of the ball’s movement as it passes. This study suggests a CBT-based piezoelectric nanogenerator for potential use in piezoelectric sensors that has dramatically improved energy harvesting characteristics.Keywords:piezoelectric energy harvesting;three-dimensional coral-like BaTiO3;polyvinylidene fluoride (PVDF);flexible
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）