Journal of Materials Chemistry A
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2021
·Vol. 10
·期 2
·891-901
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IF 12.732
Fan Yang,Yidong Hu,Qiaodan Hu,Sebastian Steiner,Till Frömling,Linhao Li,Patrick Wu,Emilio Pradal-Velázquez,Derek C. Sinclair
Bulk conductivity (σb) values of nominally stoichiometric Na0.5Bi0.5TiO3 (NBT) prepared by solid-state reaction collated from literature show random variation between 10−6 to 10−3 S cm−1 (at 600 °C). This makes it challenging to obtain reliable and reproducible performances of NBT-based devices, especially as the underlying reason(s) for this variance are not fully understood. Here we report the dramatic impact of the TiO2 reagent, in particular, the polymorphic form of TiO2 on the electrical conductivity and conduction mechanism of NBT. Based on our solid-state processing route, NBT ceramics prepared by rutile TiO2 are ionically conductive, and those prepared by anatase TiO2 are insulating. The dramatic difference in electrical properties of NBT prepared using rutile and anatase TiO2 is related to the NBT formation process: the intermediate phase Bi12TiO20 is more stable during formation of NBT in the case of anatase TiO2, which reduces the volatility of Bi2O3 during solid-state reaction. These results give plausible explanations for the large variation of σb reported in the literature and highlight the importance of selecting an appropriate TiO2 reagent when targeting controllable σb in NBT-based ceramics. For ion-conducting applications (such as in intermediate-temperature solid oxide fuel cells, IT-SOFCs), rutile TiO2 should be used, and for dielectric applications (such as in multilayer ceramic capacitors, MLCC) anatase TiO2 should be used.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Ruihan Du,Kunkun Xiao,Shuiyuan He,Yang Wang,Chunli Kang
In this study, Bi 4 Ti 3 O 12 nanosheets and flower-like MoS 2 were synthesized by hydrothermal method and compounded into p-n heterojunctions with 2 D– 2 D structure. The stable p-n heterojunctions exhibit excellent visible-light-driven catalytic activity through effective electron/hole (e - /h + ) separation, which generates a built-in electric field between the two components, accelerates the separation efficiency of photogenerated charges between the materials, and reduces the photogenerated electron-hole complexation efficiency. The methylene blue (MB) was degraded under simulated sunlight conditions, and the removal efficiency of MB at an initial concentration of 10 mg/L could reach 91.1% within 270 min. HRTEM and microstructural study revealed microscopic close interaction between the two phases, which can shorten the transport path of photogenerated electron-hole pairs, and optical measurement studies show a significant improvement in visible light absorption and charge carrier separation due to the formation of heterojunctions. Free radical quenching experiments and electron paramagnetic resonance (EPR) showed that the main active substances are·OH and·O 2 - , and photogenerated h + is also involved in the photocatalytic reaction process. The system also shows good degradation efficiency in different water matrices, five-cycle experiments, and good structural stability elucidate its potential application in degrading emerging pollutants for water purification.
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
Small
·
2021
·Vol. 18
·期 4
·2106209
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IF 13.281
Chengwen Bin,Xu Hou,Yadan Xie,Jingtong Zhang,Han Yang,Linrong Xu,Hua Wei,Jie Wang
Ferroelectric thin film capacitors have attracted increasing attention because of their high energy storage density and fast charge–discharge speed, but less attention has been paid to the realization of flexible capacitors for wearable electronics and power systems. In this work, flexible x Mn-BiMg 0.5 Ti 0.7 O 3 ( x Mn-BMT 0.7 ) thin film capacitors with ultrahigh energy storage density and good stability are deposited on mica substrate. The introduction of excess TiO 2 with an amorphous structure contributes to the forming of the polar nano regions, resulting in the reduced ferroelectric hysteresis. In order to further improve the energy storage performance, Mn doping increases the polarization by regulating chemical pressure in the lattices and inhibits the valence change of Ti 4+ . Especially in the 1.5% Mn-BMT 0.7 film capacitor, an ultrahigh energy storage density of 124 J cm -3 and an outstanding efficiency of 77% are obtained, which is one of the best energy storage performances recorded for ferroelectric capacitors. In addition, the flexible ferroelectric film capacitor also exhibits good thermal stability (25–200 °C), high frequency reliability (500 Hz–10 kHz), excellent electrical (10 8 cycles), and mechanical (10 4 cycles) fatigue properties. This work is expected to pave the way for the application of BMT-based thin film capacitors in flexible energy storage systems.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
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IF 14.7
Jia Guangri,Sun Fusai,Zhou Tao,Wang Ying,Cui Xiaoqiang,Guo Zhengxiao,Fan Fengtao,Yu Jimmy C.
Artificial photosynthesis is a promising approach to produce clean fuels via renewable solar energy. However, it is practically constrained by two issues of slow photogenerated carrier migration and rapid electron/hole recombination. It is also a challenge to achieve a 2:1 ratio of H 2 and O 2 for overall water splitting. Here we report a rational design of spatially differentiated two-dimensional Bi 4 Ti 3 O 12 nanosheets to enhance overall water splitting. Such a spatially differentiated structure overcomes the limitation of charge transfer across different crystal planes in a single crystal semiconductor. The experimental results show a redistribution of charge within a crystal plane. The resulting photocatalyst produces 40.3 μmol h –1 of hydrogen and 20.1 μmol h –1 of oxygen at a near stoichiometric ratio of 2:1 and a solar-to-hydrogen efficiency of 0.1% under simulated solar light.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Binbin Tan,Jing Wang,Yao Deng,Huidi Zhang,Jiang Wang,Zhihao Zhang,Wenlei Wang
The key to enhancing the activation efficiency of peroxydisulfate (PDS) lies in facilitating the adsorption of PDS and accelerating the rate of electron transfer at the interface. In this work, the oxygen vacancy (Ovs) concentration of ultrathin Bi 4 Ti 3 O 12 (BTO) was controlled in situ by high-energy electron beam bombardment. BTO V -300 exhibited a significant activation effect on PDS. The degradation rate constant ( k obs ) for the removal of ciprofloxacin (CIP) was measured to be 0.2080 min −1 under visible light irradiation, which was 3.71 times greater than that of the original BTO. Density functional theory calculations uncovered the principal role of oxygen vacancies as active sites for PDS activation. Introducing OVs significantly boosted the adsorption energy of PDS on BTO and lengthened the O O bond of PDS. This study represents the potential mechanism behind the activation of PDS by BTO V and provides valuable insights for enhancing the photoactivation efficiency of PDS.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zhiwen Hu,Huiying Zhang,Yulong Yang,Qifu Bao,Weixia Dong
Photocatalysis exhibits superior catalytic performance, but its application in wastewater treatment faces challenges of water quality impact, limited removal efficiency, and instability. Piezo-catalysis, as a green and low-carbon catalytic technology, has great potential for wastewater treatment. In this study, we prepared a dandelion-like Bi 4 Ti 3 O 12 /BaTiO 3 catalyst via a template-free and one-step solvothermal method. The hierarchical microstructure assembled from nanosheets and nanoparticles was formed due to the shear effect of potassium hydroxide (KOH) and directional adsorption during the reaction process, and it has a high specific surface area and outstanding piezo-photocatalytic performance compared to individual Bi 4 Ti 3 O 12 or BaTiO 3 catalysts. The piezo-photocatalytic degradation efficiency of dyes by Bi 4 Ti 3 O 12 /BaTiO 3 reaches 99.5 %, and demonstrates excellent stability and wide applicability. This result was ascribed to the synergistic effect of heterojunction band structure and piezoelectric properties. Furthermore, the removal mechanism analysis indicates that the holes (h + ) and superoxide radical (O 2 − ) play a major role in the piezo-photocatalytic degradation of dyes. This work presents a novel method for developing efficient piezo-photocatalytic composite catalysts with a broad prospect for wastewater treatment.
研究领域:
材料科学
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环境工程
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纳米催化
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物理化学
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能源与环境材料
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DOI
高影响因子
Environmental Science-Nano
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2024
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IF 5.8
Junzhuyan Wang,Chenjie Zhang,Zhao Qi,Minmin Xu,Yaxian Yuan,Jianlin Yao
Photocatalytic degradation and low-concentration detection of tetracycline (TC) are often limited by the high recombination ratio of carriers and low sensitivity. Herein, we synthesized Bi4Ti3O12 nanosheets (BiTO NSs) by a molten salt method and decorated them with silver nanoparticles (Ag NPs) to obtain BiTO/Ag heterojunctions for degradation via piezo-photocatalysis and detection by surface enhanced Raman spectroscopy (SERS). The synergetic effect originating from piezoelectricity and surface plasmon resonance (SPR) can improve the photon utilization, resulting in an enhancement in the catalytic performance and detection sensitivity. The reduction of TC by BiTO/Ag was as high as 92.1% within 120 min in a solution of 10 ppm, and the limit of detection (LOD) can reach 0.01 ppm. This work offers a new strategy to achieve the effective degradation and high-sensitivity detection of TC by a BiTO/Ag bifunctional heterojunction material.
研究领域:
环境科学
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材料科学
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分析化学
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DOI
高影响因子
ChemSusChem
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2025
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IF 6.6
Kuan Wang,Yuan-Xiao Du,Huan Ma,Rui Luo,Zhe Cao,Zhen-Hong He,Jian-Gang Chen,Weitao Wang,Huan Wang,Zhao-Tie Liu
In the context of energy shortage and global warming, the transformation of carbon dioxide (CO 2 ) into value-added chemicals through photocatalytic processes has garnered significant attention. However, constructing highly efficient photocatalytic materials for CO 2 reduction continues to present substantial challenges, especially for the customization of highly efficient heterojunction photocatalysts. Herein, honeycomb-like BiOCl/Bi 2 Ti 2 O 7 S-scheme heterojunctions with enriched oxygen vacancies are successfully fabricated by an interlayer self-assembly strategy. The experimental results demonstrated that the photocatalytic CO production over BiOCl/Bi 2 Ti 2 O 7 -3 composites reached 48.16 μmol g −1 h −1 , exhibiting a high selectivity (96.6%) and an excellent stability. The photocatalytic activity exhibited a remarkable improvement, achieving 2.4- and 133.7-fold enhancement compared with that of the pristine BiOCl and Bi 2 Ti 2 O 7 , demonstrating a superior performance of the synthesized composite catalyst. The remarkable enhancement in photocatalytic performance stems from the synergistic effect among the unique interface structure of S-scheme heterojunction, oxygen vacancy engineering, and the porous honeycomb-like morphology. The S-scheme heterojunction, with its unique band structure, can effectively enhance light utilization efficiency, improve the reduction capacity of photogenerated carriers, and thereby accelerate their separation and transfer. This meticulous design presents a unique approach for the customization of S-scheme heterostructures with desirable charge transfer for efficient photoreduction of CO 2 applications. Graphical A honeycomb-like BiOCl/Bi 2 Ti 2 O 7 S-scheme heterojunction with enriched oxygen vacancies wasis fabricated by an interlayer self-assembly strategy, boosting the photocatalytic CO 2 reduction performance.
研究领域:
材料科学
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环境催化
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能源化学
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光催化
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无机功能材料
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
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IF 19
Lvye Dou,Xianglei Pu,Bingbing Yang,Chi Zhang,Yujun Zhang,Wei Xu,Lei Li,Jianqiang Li,Hui Wu,Ce-Wen Nan,Yuan-Hua Lin
Ceramics possess notable attributes including high-temperature stability, strong chemical tolerance, and exceptional wear resistance, rendering them highly promising for various applications. Nevertheless, the brittleness of ceramics presents a substantial hurdle in harnessing their full potential for applications in wearable devices and unconfined loading environments. In this study, an entropy-assisted strategy is proposed to realize the flexibility of Bi 4 Ti 3 O 12 -based dielectric nanofibers. The findings illustrate that augmented atomic configurational entropy within the nanofibers instigates favorable structural changes, including the development of refined grains and a substantial amorphous component, thereby leading to the notable improvement in the flexibility of ceramic nanofibers with functional properties. The flexible high-entropy nanofibers enable the development of a high-performance capacitive strain sensor with remarkable response sensitivity (1.62 kPa −1 ), wide temperature range adaptability over 25–350 °C, and excellent fatigue resistance over 3000 cycles. Importantly, this entropy-driven approach holds promise for the advancement of flexible functional ceramics, extending beyond simple oxides such as amorphous silica and alumina.
研究领域:
材料科学
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纳米技术
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传感器
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陶瓷
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柔性电子学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Sen-Wang Wang,Zhen-Hong He,Yue Tian,Zhan-Jun Zhu,Yong-Chang Sun,Kuan Wang,Weitao Wang,Yang Yang,Huan Wang,Zhao-Tie Liu
Photothermal CO 2 oxidative dehydrogenation of propane (CO 2 -ODHP) is an environmentally friendly and sustainable route for propylene production and CO 2 utilization. In the present work, we developed a Pt-GaN/SrTiO 3 dual-functional catalyst to facilitate the reaction. The catalyst achieved propylene and CO yields of 1 mmol·g cat -1 ·h -1 and 1.2 mmol·g cat -1 ·h -1 under photothermal conditions at 320 °C, surpassing the performance of previously reported catalysts. Additionally, control experiments and in situ DRIFTS analyses corroborated that GaN and Pt were primarily responsible for the activation of C-H and C O bonds, respectively, and the photothermal route worked via a distinguished intermediate for CO 2 activation in contrast to the thermal route. DFT calculations supported the reaction route involving the coupling direct dehydrogenation of propane and reverse water-gas shift reaction. The present work shines a light on the design of photothermal catalysts with dual functions, particularly for the activation of CO 2 and light hydrocarbons. Additionally, it proposes a strategy to initiate high-temperature reactions at relatively lower temperatures.
研究领域:
催化
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化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2021
·
IF 4.051
Guochang Chen,Jinyue Du,MingMing Zhu,Hongming Long,Yuchen Song,Hao Hu,Hexin Zhang
Photocatalytic H 2 evolution through water splitting on the semiconductor catalysts is a promising and efficient solution to convert inexhaustible solar energy into chemical fuel. In this report, the robust two-dimensional BWV-x (0 ≤ x ≤ 0.5) solid solution were synthesized via a facile one-step strategy for photocatalytic H 2 evolution. The band gaps of BWV-x could be tuned easily in a wide range from 3.0 to 2.2 eV according to their chemical composition. When the value of x was 0.33, the BWV-0.33 displayed a high H 2 generation rate of 747 μmol.h −1 g cat −1 , which was about 5.2-fold that of pristine Bi 2 WO 6 . Mott-Schottky and UV–Vis absorbance spectroscopy studies of BWV-x revealed that the appropriate band gap and high conduction band edge position of BWV-0.33 led to a significant improvement in photocatalytic performance. The charge transfer mechanism for H 2 production over the BWV-0.33 was further proposed. This work shows the potential of band gap engineering by constructing solid solutions for efficient semiconductor photocatalysis.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 22
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IF 4
Wang Mingwen,Yang Shuai,Wu Jie,Li Jinglei,Qiao Liao,Liu Xuechen,Wang Chao,Feng Xinya,Li Chunchun,Li Fei
High-temperature piezoelectric devices require piezoelectric ceramics with high Curie temperatures and high-temperature stability of piezoelectric properties to avoid the depolarization of piezoelectric ceramics during application. However, piezoelectric materials with high Curie temperatures usually have restrained piezoelectric properties. Crystallographic orientation via texture engineering is a practicable way to improve piezoelectric performance. Here, we propose a sintering-aid-assisted template grain growth strategy to texture BiScO 3 -PbTiO 3 ceramics to overcome the low orientation issue that challenges the texturing of BS-PT for decades. By judiciously selecting B 2 O 3 -CuO as sintering aids, we fabricated highly ⟨001⟩-textured 0.43BS-0.57PT ceramics with Logtering factors >99.0% that possess high piezoelectric coefficients d 33 of 474–612 pC/N while maintaining relatively high Curie temperatures of 370–402 °C. Importantly, this work addresses a long-standing issue presented in BS-PT ceramics, i.e., the low electromechanical coupling property of BS-PT ceramics ( k 33 < 0.70) by improving the electromechanical coupling factor k 33 to 81.2%. The newly designed textured BS-PT ceramics are thought to be promising candidates for the design of high-temperature piezoelectric transducers and actuators.
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
危险品化学品经营许可证（带存储）