ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiyou Zhong,Liwei Zeng,Weiren Zhao,Jakoah Brgoch
Broadband near-infrared (NIR) phosphors are in high demand for creating “smart” NIR phosphor-converted light-emitting diode (pc-LED) sources. In this work, a series of Cr3+-substituted NIR-emitting materials with highly efficient, broad, tunable emission spectra are achieved by modifying the simple oxide Ga2O3 using [Mg2+-Ge4+] and [Ga3+-Ga3+] co-unit substitution. The results show that the emission peak can be shifted from 726 to 830 nm while maintaining a constant excitation peak in the blue light region, enabling extensive application. The optical properties stem from changes in the Cr3+ crystal field environment upon substitution. Intriguingly, the temperature-dependent photoluminescence emission peak position shows virtually no change in the [Mg2+-Ge4+] co-substituted materials. This abnormal phenomenon is found to be a comprehensive embodiment of a weakening crystal field environment (red-shift) as the temperature increases and reduced local structure distortion (blue-shift) with increasing temperature. The high quantum yield, NIR emission, and net-zero emission shift as a function of temperature make this phosphor class optimal for device incorporation. As a result, their performance was studied by coating the phosphor on a 450 nm emitting LED chip. The fabricated device demonstrates an excellent NIR output power and NIR photoelectric conversion efficiency. This study provides a series of efficient, tunable, broadband NIR materials for spectroscopy applications and contributes to the basic foundation of Cr3+-activated NIR phosphors.
研究领域:
材料科学
·
光学材料
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固态照明
·
光子学
·
发光材料
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DOI
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·1651-1672
·
IF 3.6
Zhang Lei,Zou Zhuorui,Lei Zhang,Jia Yang
In this research, xylene was utilized as a simulated gas, γ-Al 2 O 3 pellets were selected as catalyst carriers, and FeO x , MnO x , CeO x , and CuO x were used as active components to analyze the synergistic treatment of VOCs–O 3 by low-temperature plasma combined with supported catalysts. Different metal oxides and other factors influence the synergistic treatment of VOCs–O 3 . The results showed that the catalytic effect of Fe–Mn/γ-Al 2 O 3 prepared by the equivalent volumes of consecutive impregnation method was better than that of Fe–Mn/γ-Al 2 O 3 prepared by co-impregnation method. When combined with low temperature plasma technology, high-energy electron collision reaction and oxidation reaction between free radicals occurs, which played a synergistic role in the degradation of VOCs–O 3 . The total removal rate of xylene was 94.88%, and the depletion rate of ozone was 84.1%.
研究领域:
環境科學
·
化學工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Weijia Tang,Yunjiao Li,Kaibing Li,Shijie Jiang,Zhenjiang He
The commercialization of O3-type layered cathodes is obstructed by two intertwined degradation pathways: anisotropic lattice strain accumulation causing mechanical failure and a chemically unstable surface triggering relentless parasitic reactions. Herein, we devise a dual-aspect strategy to concurrently address these coupled challenges through synergistic bulk and interface engineering. We employ Cu2+ as a near-surface lattice strain buffer to deliberately expand Na layers and mitigate Jahn–Teller distortion, which uniformizes internal strain evolution and suppresses crack formation, as directly visualized by in situ XRD and post cycling strain mapping. Simultaneously, an in situ formed phosphate coating functions beyond a passive barrier as an active interfacial purifier, scavenging residual carbonates to construct an electrochemically pristine and stable cathode electrolyte interface. This mutually reinforcing, inside-out synergy enables the modified cathode to deliver a capacity retention of 76% after 300 cycles (vs 53% for the pristine) and exceptional air stability (93% capacity retention after 30 days). This work transcends the conventional additive approach of substitution and coating, establishing a codesign principle that integrates physical strain regulation with interfacial chemistry control for developing ultra-stable layered oxide cathodes.
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DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Wenping Cao,Jiabin Tu,Nuo Xu,Zhuang Wang,Xinyan Xiong,Qianru Lin,Jiazhi Wang,Nan Zhang,Jie Sheng,W.L. Li
Optimizing energy storage performance often involves increasing the discrepancy between maximum polarization and remanent polarization ( P max - P r ) and breakdown strength ( E b ). Here, aging treatment in acceptor doped NBT-based film is taken for increasing both E b and P max - P r by constructing ordered defect dipoles. Enhanced P max - P r value of 80.6 μC/cm 2 and high E b of 2630 kV/cm are obtained in the aged (Na 0.5 Bi 0.5 ) 0.55 Sr 0.45 Ti 0.99 Mn 0.01 O 3 thin film, which can be attributed to the reversible domain switching caused by ordered defect dipoles and low oxygen vacancies concentration. Accordingly, an energy density of 72.4 J/cm 3 with an efficiency of 76.8 % was achieved simultaneously in the aged film, which are approximately raised by 80.6 % and 45.2 %, respectively, compared with the unaged state. The stable energy storage performances are achieved within the scope of operating temperatures (20–200 ◦ C) and frequencies (0.2–10 kHz). These results provide a new route to take usages of aging process for optimizing the energy performance of NBT-based thin films.
研究领域:
材料科学
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凝聚态物理
·
应用物理
·
纳米技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wenyi Li,Feng Li,Xiaoming Qiu,Chuangchuang Gong,Min Jiang,Zhenxin Zhao,Xiaomin Wang
Owing to the intrinsic dielectric-magnetic coupling loss mechanism, perovskite-type lanthanide-transition metal oxide (LaTMO 3 ) is considered as a promising candidate for electromagnetic wave absorbing material, but unmodified LaTMO 3 suffers from limited polarization processes and weak super-exchange magnetic response. Herein, we manipulate the TM-O bond properties by regulating the configuration entropy of transition metal sites to address such issues within single-phase LaTMO 3 . Elaborate structural characterization and P-V-L bond theory demonstrate quantitatively the optimization of electromagnetic wave absorption performance mainly stems from the synergistic improvement in TM-O bond distortion degree and covalency, as well as the formation of diverse super-exchange pathways. Consequently, the high entropy La(Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 )O 3 exhibits a minimum reflection loss of −50.68 dB, an effective absorption bandwidth covering entire Ku band of 7.6 GHz. The radar cross section of the structure with La(Cr 0.2 Mn 0.2 Fa 0.2 Co 0.2 Ni 0.2 )O 3 coating are less than −10 dBm 2 within the incident angles -60-60°. This study contributes to a deeper understanding of design and preparation of efficient broadband electromagnetic wave absorbing materials.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Zhiqiang Zhang,Fan Zhang,Yiwen Niu,Meiyue Li,Jihang Liu,Zhan Jie Wang
Dielectric capacitors typically require high electric fields to achieve excellent energy storage density, which limits the integration, miniaturization, and lifespan of energy storage devices. Therefore, it is essential to obtain good energy storage properties at a lower electric field. In this study, (Ag 0.94 La 0.02 )(Nb 0.85 Ta 0.15 )O 3 (ALNT)-modified (Bi 0.5 Na 0.5 )TiO 3 -based ceramics with improved energy storage characteristics were designed and prepared. The introduction of ALNT is conducive to optimizing the polarization, adjusting the phase composition, disrupting the long-range ferroelectric ordering, and enhancing the dielectric relaxation behavior, leading to an increase in the polarization difference. Accordingly, superior recoverable energy storage density of 3.07 J/cm 3 and high efficiency of 82.7% are synchronously realized under a lower electric field of 150 kV/cm in a 5 mol% ALNT system. In addition, the corresponding sample exhibits wide thermal (40–100°C) and frequency (10–100 Hz) stability and good charge–discharge properties. This study provides a new candidate material for advanced dielectric capacitors that can be applied in lower electric fields.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qingfeng Liu,Fanbin Hu,Jinhua Shi,Zitong Fei,Chenchen Li,Qi Meng,Peng Dong
The O3-type layered cathode material NaNi 1/3 Fe 1/3 Mn 1/3 O 2 has gained attention due to its cobalt-free composition, low cost, and structural stability. In this study, we employ a “local defect energy state construction” approach to precisely regulate the formation and migration of oxygen vacancies at the atomic scale. Zr 4+ and Sm 3+ are selected to achieve synergistic optimization of both the bulk and surface properties, precisely guiding the formation of local defects and establishing a mechanism that combines bulk defect regulation with surface protection. Zr 4+ bonds strongly with oxygen through 4d–2p orbital hybridization, which helps keep lattice oxygen stable, makes oxygen vacancy distribution more uniform, and improves structural stability. Sm 3+ , with its relatively large ionic radius, facilitates the formation of a stable Sm 2 O 3 surface layer, while the remaining Zr forms a ZrO 2 coating, together providing enhanced protection to the cathode material. High-temperature heat treatment enables the spatial confinement and diffusion of Zr 4+ , constructing a multi-scale defect distribution network that restricts the randomness of vacancies and improves the stability of the sodium ion migration pathways. Compared to the bare cathode material, the modified material exhibits a significant improvement, with the discharge specific capacity increasing from 16.5 mAh g −1 to 107.5 mAh g −1 after 300 cycles at 1C, and the capacity retention rising from 15.73 % to 85.66 %. In full-cell tests with hard carbon as the anode, the material maintained strong electrochemical performance, delivering an initial discharge capacity of 101.1 mAh g −1 at 1C, with 63.47 % capacity retention after 300 cycles. Both theoretical calculations and experimental results demonstrate that this structural design balances surface protection with internal defect regulation, optimizing both structural stability and ionic transport performance.
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DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 5
·3422-3434
·
IF 1.8
Zhiyuan Ma,Qingqing Yang,Bin Meng,Xinyu Ping,Xiaoyu Pan,Congcong Fang
A series of (Ba 0.2 Sr 0.2 Na 0.2 Ca 0.2 La 0.2 )(Zr x Ti 1- x )O 3 (BSNCLZ x T 1- x ) ( x = 0, 0.05, 0.1, 0.15, and 0.2) high-entropy ceramics were prepared in forms of bulks and thin films by conventional sintering and spin-coating, respectively. All ceramic bulks and thin films are composed of a single perovskite-structured solid solution. The introduction of the Zr element reduces the dielectric loss of bulks and thin films and improves the frequency stability of the dielectric constant. The ceramic bulks have a higher dielectric constant and lower loss than their corresponding thin films. As x rises from 0 to 0.2, the breakdown strength E b of the ceramic bulks increases from 209 to 327 kV/cm, and that of thin films enhances from 890 to 1770 kV/cm. The bulks and thin films of BSNCLZ 0.1 T 0.9 possess the maximum recoverable energy density W rec (0.82 and 3.48 J/cm 3 ) and energy storage efficiency η (95.8% and 86.8%).
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyu Liu,Taotao Ai,Yazhong Zheng,Xinyu Chen,Qin Li,Qian Qiu,Ying Zheng,Yuan Zhou,Haikui Song,Kun Yu,Chunlin Song,Haibo Zhang,Yan Yan,Gang Liu
The lead-free piezoelectric ceramics used in piezoelectric actuators have attracted extensive attention owing to their substantial electric-field-induced strain. In this study, The (1- x )Bi 0.5 (Na 0.41 K 0.09 )TiO 3 - x Sr(Hf 0.5 Sb 0.4 )O 3 (BNKT- x SHS) piezoelectric ceramics were synthesized using the conventional solid-state reaction method. The impact of SHS substitution on the microstructure and electrical properties was systematically explored. Among them, the BNKT-0.015SHS sample, featuring ergodic relaxor states, demonstrates a high piezoelectric strain coefficient ( d 33 *) of 785 p.m./V under a low electric field of 50 kV/cm(Strain = 0.392 %). It exhibits a repeatable strain value of 0.47 % under an 80 kV/cm electric field( d 33 * = 590 p.m./V). Moreover, the strain values remain around 0.4 % between room temperature and 100 °C, with variations within 90 %. The heightened repeatable strain response is considered to be linked to the electric field-induced reversible phase transition occurring within the ergodic relaxor state. The higher strain temperature stability is ascribed to the coexistence of quadrilateral polar nanoregions and rhombic polydomain nanoregions. This study provides an effective example for achieving significant strain responses, presenting a feasible candidate material for applications in piezoelectric actuators.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Wen-Long Wang,Peng-Hui Liu,Jung-Hyun Son,Hang Su,Min-Yong Lee,Hong-Ying Hu,Qian-Yuan Wu,Uwe Hübner
The combination of ozonation and Mn(II) (O3/Mn(II)) is expected to synergistically eliminate recalcitrant organic micropollutants in water. However, the decay of O3, formation of •OH and reactive manganese species (RMnSs), and synergism in micropollutant degradation have not been comprehensively understood. Herein, the synergism of O3 and Mn(II) was observed to be pH-dependent. Compared to ozonation alone, O3/Mn(II) preferentially formed Mn(V and VI) and slightly increased •OH yield (from 0.22 to 0.30) at acidic pH 4–5, while it preferentially formed Mn(VII) and significantly increased OH yield (from 0.52 to 0.74) at circumneutral pH 6–7. Thereafter, O3/Mn(II) prominently increased RMnS exposure at acidic pH, while it dramatically diminished O3-exposurse to increase •OH exposure at circumneutral pH. As a result, O3/Mn(II) outperformed ozonation alone for the degradation of various O3-resistant micropollutants (3.7–7.9 times faster). For example, the RMnSs (82.7% contribution) and •OH (84.2% contribution) were the dominant contributors to the degradation of the isothiazolinone biocide (5-chloro-2-methyl-4-isothiazolin-3-one) at acidic and circumneutral pH, respectively. Mn(II) can enhance the removal of O3-resistant micropollutants in relatively clean waters (e.g., tap water), but its effectiveness was limited in more contaminated waters (e.g., WWTP effluent). These findings support the practice and pH optimization of the O3/Mn(II) in various water types.
研究领域:
环境科学
·
水处理工程
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 10
·1-9
·
IF 2.584
Meng Ke,Li Wenhua,Tang Xingui,Guo Xiaobin,Liu Qiuxiang,Jiang Yanping
Ferroelectric materials with the typical perovskite structure are widely used in capacitors, ultrasonic devices, oil drilling, transducers, and other fields. Lead-lanthanum-zirconium-titanate ceramics co-doped with Sn and Ba , have been widely investigated. However, there is little attention has been focused on the dielectric properties of barium-lanthanum-zirconium-titanate. Thus, in this work, Sn doped Ba 0.955 La 0.03 Zr 0.02 Ti 0.98 O 3 ferroelectric ceramics were prepared via a classical high-temperature solid state reaction. Scanning Electron Microscopy (SEM) was used to observe the surface appearance of ceramics. The X-ray diffraction (XRD) patterns at room temperature, indicate that the ceramics are well crystallized. Impedance properties and dielectric properties reflect the characteristic of typical high temperature dielectric relaxation behavior. The conductive activation energy and the relaxation activation energy are obtained through the calculation of the Arrhenius law. The fitting results show that the dielectric relaxation behavior at high-temperature, was related to the oxygen defect. The electrical modulus verified the partial short-range carrier migration, also contribute to the high-temperature dielectric properties.
研究领域:
材料科学
·
固态物理
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121689
·
IF 7.5
Meiling Cai,Xiaojun Miao,Xiaoyan Wang,Xueyan Xue,Hui Zhu,Liping Yang,Xinqian Zhang,Jiao Yin
Heterogeneous catalytic ozonation (HCO) is a promising technology for water purification but is often restricted by low ozone utilization and poor gas-liquid-solid mass transfer. In this work, a dual-enhanced catalytic ozonation system was developed by coupling a nitrogen-doped cotton-straw-derived biochar supported mixed-valent iron catalyst (FeO x -N-BC) with ozone micro-nanobubbles (O 3 -MNBs). The catalyst was synthesized via impregnation and two-step pyrolysis, enabling uniform dispersion of Fe active sites and electronic structure modulation through nitrogen doping. The O 3 -MNBs improved ozone dissolution and transfer efficiency at the interface. Under optimal conditions, the FeO x –N–BC/O 3 –MNBs system achieved an SMX removal efficiency of 83.3 % and a mineralization rate of 37.9 %, with a pseudo-first-order kinetic constant of 0.30 min −1 , significantly outperforming single ozonation. EPR and quenching experiments confirmed a radical-nonradical dual degradation pathway dominated by singlet oxygen ( 1 O 2 , 25.13 %). XPS revealed that C, N, and Fe species underwent synergistic valence state evolution, sustaining ROS generation and catalytic stability. The system maintained 51.1 % removal efficiency after five cycles with negligible anion interference. This study demonstrates a low-cost, efficient, and stable catalytic ozonation strategy, providing a practical route for antibiotic wastewater treatment and valorization of agricultural residues.
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高影响因子
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