CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Jiaxing Xie,Qun Liu,Lijuan Huang,Xingyu Chen,Chunlin Zhao,Xiao Wu,Tengfei Lin,Yong Wu,Min Gao,Cong Lin
The Fenton reaction, an effective advanced oxidation process (AOP) for degrading organic pollutants, requires the addition of H 2 O 2 that is expensive and not environmentally friendly to some extent. It has been reported that piezocatalysis can generate H 2 O 2 under mechanical excitation. Therefore, it is promising to carry out the Fenton catalysis utilizing in situ H 2 O 2 generated by piezocatalysis. However, the current piezocatalysis-assisted Fenton (Piezo-Fenton) reaction was realized by adding piezoelectric nanoparticles and Fe(II) ions to pollutant solutions, which would induce more iron-based chemicals that are not easy to recycle. Herein, Fe 3 O 4 -BaTiO 3 nanocomposites were prepared to demonstrate the feasibility of piezo-Fenton catalysis without the addition of H 2 O 2 or Fe(II) ions. The organic dye degradation efficiency of 98.2% is obtained using Fe 3 O 4 -BaTiO 3 nanocomposites in the acidic solution, one-third and two-thrid greater than that of pure piezocatalysis and that of iron-based Fenton reaction , respectively. Moreover, since the piezocatalysis process is the rate-determining step of the whole piezo-Fenton reaction, all the H 2 O 2 generated can be consumed. Considering that the solid nanocomposites can be magnetically recycled, piezo-Fenton catalysis leaves no additional chemicals in clean water and thus provides an environmentally friendly and low-cost approach for organic dye degradation.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Bing Xie,Qi Zhang,Haibo Zhang,Guangzu Zhang,Shiyong Qiu,Shenglin Jiang
Uniform morphology BaTiO 3 nanowires with high aspect ratio (>100) were synthesized via a novel stirring hydrothermal method . The BaTiO 3 /P(VDF-CTFE) nanocomposite films were prepared by a simple solution casting method using dopamine modified BaTiO 3 nanowires as nanofillers and ferroelectric polymer P(VDF-CTFE) as matrix. A maximum dielectric displacement of 9 μC/cm 2 under the electric field of 3000 kV/cm was achieved for the nanocomposites with 3 vol% BaTiO 3 nanowires. These nanocomposites with dopamine modified BaTiO 3 nanowires also exhibit an enhanced energy density of 8.4 J/cm 3 at a relative low electric field of 2700 kV/cm. This energy density is 55% higher than that of the pure P(VDF-CTFE) (−5.4 J/cm 3 at 3600 kV/cm). Such significant enhancement in dielectric displacement and energy density is attributed to the combined effects of both surface modification by dopamine and the high aspect ratio of the BaTiO 3 nanowires. Our study has a promising commercial potential in practical application in the automobile and aerospace field, which require greater energy density with a lower operating voltage.
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高影响因子
ACS Applied Materials & Interfaces
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2014
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IF 5.9
Ming Zhu,Xingyi Huang,Ke Yang,Xing Zhai,Jun Zhang,Jinliang He,Pingkai Jiang
The interfacial region plays a critical role in determining the electrical properties and energy storage density of dielectric polymer nanocomposites. However, we still know a little about the effects of electrical properties of the interfacial regions on the electrical properties and energy storage of dielectric polymer nanocomposites. In this work, three types of core–shell structured polymer@BaTiO3 nanoparticles with polymer shells having different electrical properties were used as fillers to prepare ferroelectric polymer nanocomposites. All the polymer@BaTiO3 nanoparticles were prepared by surface-initiated reversible-addition–fragmentation chain transfer (RAFT) polymerization, and the polymer shells were controlled to have the same thickness. The morphology, crystal structure, frequency-dependent dielectric properties, breakdown strength, leakage currents, energy storage capability, and energy storage efficiency of the polymer nanocomposites were investigated. On the other hand, the pure polymers having the same molecular structure as the shells of polymer@BaTiO3 nanoparticles were also prepared by RAFT polymerization, and their electrical properties were provided. Our results show that, to achieve nanocomposites with high discharged energy density, the core–shell nanoparticle filler should simultaneously have high dielectric constant and low electrical conductivity. On the other hand, the breakdown strength of the polymer@BaTiO3-based nanocomposites is highly affected by the electrical properties of the polymer shells. It is believed that the electrical conductivity of the polymer shells should be as low as possible to achieve nanocomposites with high breakdown strength.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Kangwei Zhang,Tianci Fang,Shuren Wang,Hongyu Wang,Ruoyi Jin,Xinyu Li,Zixian Qiu,Junli Fu,Zhen Qu,Yujie Liang,Wenzhong Wang
A novel BaTiO 3 /CdS-sensitized TiO 2 photoanode was designed for PEC H 2 evolution. • Continuous stepped band structure was formed into TiO 2 for boosting PEC reaction. • BaTiO 3 /CdS-sensitized TiO 2 photoanode exhibits remarkably enhanced H 2 generation. • Continuous stepped charge transport channel drives charge carrier separation. • Enhanced PEC performance is due to boosted light utilization and charge separation. A key challenge for photoanodes in photoelectrochemical (PEC) water splitting hydrogen evolution is the simultaneous enhancement of light harvesting efficiency, surface water oxidation kinetics, bulk charge carrier separation and surface charge carrier injection efficiency. In this work, BaTiO 3 and CdS nanoparticles are sequentially exploited to sensitize TiO 2 photoanode, constructing continuous step-like charge transfer channels for efficient PEC hydrogen evolution. As a result, the BaTiO 3 /CdS-sensitized TiO 2 photoanode exhibits a negative shift in initial potential, a low overpotential and a reduced Tafel slope, confirming that synergistic sensitization of BaTiO 3 and CdS effectively accelerates the surface water oxidation kinetics of TiO 2 photoanode. Simultaneously, BaTiO 3 /CdS-sensitized TiO 2 photoanode achieves significantly enhanced bulk and surface charge separation efficiency, 4.2 and 2.4 times higher than those of pure TiO 2 photoanode, respectively. Consequently, the hydrogen evolution rate of constructed BaTiO 3 /CdS-sensitized TiO 2 photoanode is 37.3μmol h −1 , 11.2-fold higher than that of pure TiO 2 photoanode. The finding of this work offers a novel and reliable method for the design and construction of high performance TiO 2 -based photoanodes with continuous charge transfer channels for potential applications in PEC hydrogen production. Accelerating surface reaction kinetics and boosting bulk as well as surface charge separation efficiency for enhanced photoelectrochemical hydrogen evolution of BaTiO 3 /CdS-sensitized TiO 2 photoanode. Download: Download high-res image (172KB) Download: Download full-size image
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高影响因子
Small Methods
·
2021
·Vol. 5
·期 11
·2100787
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IF 14.188
Rui Huang,Hongye Wang,Cheng Tao,Minghe Cao,Hua Hao,Zhonghua Yao,Hanxing Liu
Dielectric film capacitors are considered as potential candidates for advanced power electronics technology due to their extremely high-power densities and outstanding mechanical and thermal stability, but the further improvement of energy storage density is still needed. Here, a strategy is proposed to enhance the energy storage properties by introducing nanoscale polarization regions into amorphous films, which can significantly improve the maximum polarization and maintain a high breakdown strength. The (1− x )BaTiO 3 - x Bi(Ni 0.5 Zr 0.5 )O 3 ((1− x )BT- x BNZ) thin films are fabricated by the sol–gel method and the amorphous films with nanoscale polarization regions are obtained by adjusting the preparation process. Consistent with the conjecture, amorphous phase and nanoscale polarization regions in the (1− x )BT- x BNZ films are clearly observed by electron diffraction. Results show that giant recoverable energy density of 103.7 J cm −3 with high energy efficiency of 88.3% are simultaneously achieved at 8.3 MV cm −1 in 0.92BT-0.08BNZ thin films. Furthermore, the 0.92BT-0.08BNZ thin film exhibits excellent thermal stability in a wide temperature range of 20–200 °C, ∆ W rec / W rec20 °C < 2.2%. This work provides a novel method for dielectric thin film capacitors applied in high temperature and electric field.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Penghao Hu,Zhuye Jia,Zhonghui Shen,Peng Wang,Xiaoru Liu
To realize application in high-capacity capacitors and portable electric devices, large energy density is eagerly desired for polymer-based nanocomposite. The core–shell structured nanofillers with inorganic buffer layer are recently supposed to be promising in improving the dielectric property of polymer nanocomposite. In this work, core–shell structured TO@BT nanoparticles with crystalline TiO 2 buffer layer coated on BaTiO 3 nanoparticle were fabricated via solution method and heat treatment. The thickness of the TO buffer layer can be tailored by modulating the additive amount of the titanate coupling agent in preparation process, and the apparent dielectric properties of nanocomposite are much related to the thickness of the TO layer. The relatively thin TO layer prefer to generate high polarization to increase dielectric constant while the relatively thick TO layer would rather to homogenize field to maintain breakdown strength. Simulation of electric field distribution in the interfacial region reveals the improving effect of the TO buffer layer on the dielectric properties of nanocomposite which accords with the experimental results well. The optimized nanoparticle TO@BT-2 with a mean thickness of 3–5 nm buffer layer of TO is effective in increasing both the ε and E b in the PVDF composite film. The maximal discharged energy density of 8.78 J/cm 3 with high energy efficiency above 0.6 is obtained in TO@BT-2/PVDF nanocomposite with 2.5 vol% loading close to the breakdown strength of 380 kV/mm. The present study demonstrates the approach to optimize the structure of core–shell nanoparticles by modulating buffer layer and provides a new way to further enlarge energy density in polymer nanocomposite.
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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.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·4268-4277
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IF 2.779
You Yan-bin,Wang Hai-yan,Li Lan,Bai Lin-rui,Dang Zhi-Min
In order to improve the dielectric properties and the thermal conductivity of the PVDF-based composites, the BaTiO 3 @super-short MWCNT (BT@SSCNT) particles were modulated by a SSCNT shell fabricated by MWCNT with the different types (S-MWCNT-1020, S-MWCNT-2040). The average size of these particles is about 300 nm. With the increase in the external diameter of MWCNT, the SSCNT content of the BT@SSCNT particles decreases. However, the sum proportions of which the diameter of the particles is not less than 295 nm have a distinct growth leading to that the distance between the neighboring particles shortens. The dielectric constants of the composites are more than 355 and 1500 (10 3 Hz) at 10 wt% and 60 wt% filler loading, respectively. Compared with the BT@SSCNT/PVDF-1020 composites, the dielectric constants of the BT@SSCNT/PVDF-2040 composites have a more stable frequency dependency in the range of 10 2 to 10 6 Hz. The value of the composite with 10 wt% BT@SSCNT loading maintains more than 250 at 10 6 Hz. The introduction of the shell of SSCNT with larger external diameter can offer the composites a more desirable combined action of dielectric mechanisms, including interfacial polarization and micro-capacitor effect. In addition, the varying SSCNT shells also have evident influence on dielectric loss, breakdown strength, and thermal conductivity. It is worth mentioning that the values of the BT@SSCNT/PVDF-2040 composites are 334 and 0.16 (10 4 Hz), 229 kV mm −1 , and 1.13 W (m K) −1 at 10 wt% filler loading, respectively. This work could extend the strategies for building the core–shell particles to develop dielectric nanocomposites.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Mengna Feng,Ming Chen,Jun Qiu,Meng He,Yumin Huang,Jing Lin
For organic film capacitors, the dielectric materials with high- k , flexible and high heat-resistance are desired. Herein, a kind of hybrid particles were fabricated via self-polymerization and crosslinking reaction, containing core-shell structured BaTiO 3 @polydopamine (BT@PDA) and MoS 2 @polydopamine (MoS 2 @PDA) interlinked with poly(ethylene imine) (PEI) to perserve better interfacial interaction and uniform dispersion in poly(arylene ether nitrile) (PEN) composites. The results suggest that the designed PEN-based composites demonstrate remarkable dielectric responses. The incorporation of hybrid particles endows the polymer composites with high relative dielectric constant and comparable low dielectric loss due to the construction of diffuse electrical double layer and more micro-capacitor networks in PEN-based composites. Particularly, the dielectric constant of composite loaded with 15 wt% hybrid particles is about 254% higher than that of PEN matrix at 1 kHz, while maintaining a relatively low dielectric loss (＜0.03). More importantly, the PEN-based composites maintain their dielectric constants from room temperature to 160 °C, thus exhibiting outstanding permittivity-temperature stability, which can better meet the requirements of high temperature applications. In conclusion, this is a feasible way to incorporate hybrid particles containing core-shell structured BT@PDA and MoS 2 @PDA into polymer matrix to design dielectric composites with excellent permittivity-temperature stability.
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高影响因子
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