CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chaolong Li,Feng Wang,Hao Wang,Boying Wang,Xinru Sun,Xingcan Peng,Weikun Li,Chunli Diao,Haiwu Zheng
To meet the demand for miniaturization and integration of electronic and electrical equipments, developing dielectric capacitors with excellent energy storage properties is of utmost importance. Bi 0.5 Na 0.5 TiO 3 -based ceramics have been investigated extensively for potential energy storage applications. However, its low breakdown strength E b and high remnant polarization P r limit the energy storage density and efficiency ( η ). Therefore, we explored a synergistic design strategy of domain control and grain size adjustment via La doping to successfully synthesize 0.8Bi 0.5 Na 0.5 TiO 3 -0.2NaNbO 3 - x La 2 O 3 (0.8BNT-0.2NN- x La 2 O 3 ) ceramics with superior energy storage properties to overcome above issues. It shows that the composition regulation by antiferroelectric NaNbO 3 results in improved disrupted long rang order ferroelectric domain structure, effectively promoting the formation of polar nanoregions, subsequently weakening P r and enhancing relaxation behavior. The introduction of antiferroelectric NaNbO 3 effectively improves the η of the system. Moreover, the grain size is decreased and densification is enhanced after La tailoring, which is beneficial for the E b and recyclable energy storage density ( W rec ). Finally, a high W rec of 4.40 ± 0.20 J/cm 3 and η of 80.1 ± 2.1% at 450 kV/cm are obtained in 0.8BNT-0.2NN-0.07La 2 O 3 ceramic. Besides, the sample demonstrates admirable temperature stability (25–175 °C) and frequency stability (10–100 Hz). Simultaneously, it displays stable discharge energy density, rapid discharge time of 0.36 μs, and good fatigue endurance (10 5 cycles). The results offer useful guidance for the design of novel ceramic capacitors with comprehensive energy storage performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Licheng Yu,Youchao Wei,Yuanchao Lei,Yongsheng Liu,Maochun Hong
Inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, or I) perovskite nanowires (NWs) are promising materials for investigating charge transfer and carrier dynamics at the nanoscale level. However, the synthesis of CsPbX 3 NWs with well-defined cubic phases and the desirable properties remains challenging. In this study, we successfully synthesized uniform-diameter cubic-phase CsPbBr 3 NWs with favorable properties via trace Ca 2+ doping. By combining experimental results with first-principles calculations, we confirmed that Ca 2+ doping not only induces lattice distortion in cubic-phase CsPbBr 3 nanocubes, triggering dipole moments that drive self-assembly into single-crystalline NWs via oriented attachment but also inhibits the formation of surface defects and significantly modulates the exciton relaxation kinetics by reducing nonradiative recombination, thus enhancing the photoluminescence efficiency and stability of perovskite NWs with high crystallinity . Furthermore, by exploiting the high plasticity of the CsPbX 3 lattice, we demonstrated the ability to tune the composition and emission color of the NWs through anion exchange reactions while preserving their morphology and crystal structure. These findings provide a stable platform for preparing highly efficient perovskite materials with satisfactory optoelectronic properties for use in prospective photovoltaic and optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zujin Yang,Xiaolin Ren,Kaiming Guo,Firdoz Shaik,Bin Jiang
Iron-based metal phosphides (IMPs) have emerged as a new type of bifunctional electrocatalyst for overall water splitting with high efficiency and good stability. We report IMPs nanoparticles' fabrication with different metal element compositions anchored on phosphorus-doped vertically aligned graphene arrays (IMPs/P-VG), which is successfully achieved by tuning the different phosphates in the electroless plating solution. Compared with other metal ratios of electrocatalysts , Fe 0.5 Co 1.5 Ni 0.5 P/P-VG exhibits the best apparent and intrinsic activity in 1 M KOH, and it also shows good stability up to 12 h without any significant degradation. Moreover, benefiting the unique hierarchical vertical arrays nanostructure of the substrate and the trimetallic phosphides' synergetic effects, the Faraday efficiency of the electrolytic cell based on Fe 0.5 Co 1.5 Ni 0.5 P/P-VG double electrode for the overall water-splitting is up to 90%. This study suggests that proper tuning of the composition of metal elements in IMPs and integrated on compatible substrates can effectively improve the electrocatalytic activity of IMPs for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shiran Li,Yan Ma,Zhoufu Wang,Hao Liu,Xitang Wang,Shenghao Zeng,Zhongfeng Xia,Zhenghuang Quan,Weidong Fu,Wenhai Li
Thermal insulation materials with low thermal conductivity and high near-infrared (NIR) reflectance are required for high-temperature environments above 1000°C to enhance energy efficiency. Recently, rare-earth zirconates have attracted significant attention due to their high-temperature stability, low thermal conductivity and good corrosion resistance. However, research on the near-infrared reflection performance of Y 2 Zr 2 O 7 -La 2 Zr 2 O 7 solid solution systems for high-temperature energy-saving applications remains limited, and a systematic study on composition regulation and performance as high-temperature thermal insulation materials is needed. In this work, (La x Y 1-x ) 2 Zr 2 O 7 (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1) nano-powders were synthesized using a low-temperature solid-state reaction method, and the effects of cation substitution on the microstructure, NIR reflectance, and thermal conductivity were investigated. The results showed a phase transition from fluorite to pyrochlore as x increased. The biphasic coexisting structure inhibited grain growth, which enhanced NIR reflectance and reduced thermal conductivity. When x = 0.7, the combined effects of biphasic coexisting, lattice distortion, and defects resulted in materials with a high NIR reflectance of 91.73% and low thermal conductivity of 1.4 W/m·K, demonstrating promise for high-temperature energy-saving applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 17
·3243-3250
·
IF 4.034
Shilin Fu,Kai Cai,Long Wu,Heyou Han
A convenient method was developed for controllable synthesis of homogeneous trigonal Te/Se alloy nanorods (t-Te/Se ANRs) with diverse morphologies, aspect ratios and compositions at room temperature in aqueous solution. These alloy nanorods were formed by a self-seeding process. By varying the molar ratio of TeO2 to H2SeO3 (x(Te : Se)) in the initial precursors, the morphology of t-Te/Se ANRs was transformed mainly via two paths: formation of tri-fold nanorods (TNRs) or single nanorods (SNRs). The nanostructures of TNRs were generated only by using x(Te : Se) ranging from 30 : 1 to 10 : 1, and SNRs were formed using x(Te : Se) ranging from 200 : 1 to 100 : 1 or 2 : 1 to 1 : 1. The microstructures, compositions, and growth mechanisms of these nanorods were also analyzed in detail.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhihao Wang,Mengxiao Zhang,Jiao He,Yongan Tang,Tingchao He,Qiang Sun,Dianyuan Fan,Yu Wang
The development of emitting materials that present both photoluminescence (PL) and X-ray excited optical luminescence has recently been attracting rising research interest for visualization applications. We introduced in this study the hydrothermally crystallized (Sr 1- x Mn x ) 5 (PO 4 ) 3 F 1- y Cl y ( x = 0–0.05, y = 0–0.40) nanorods with favorable PL and X-ray excited optical luminescence properties after composition modulating. The effects of solution pH and Cl − incorporation on structure and morphology of the products were firstly unveiled. (Sr 1- x Mn x ) 5 (PO 4 ) 3 F gives green emission at ∼548 nm ( 4 T 1 ( 4 G) → 6 A 1 ( 6 S)) under either 402 nm excitation or X-ray irradiation, and the optimal PL and X-ray excited optical luminescence were observed at x = 0.03. The replacement of F − by larger Cl − led to the generation of an amount of Frenkel defects (the dislocated F − and anion vacancies V F . ) along the c -axis, benefit from which the (Sr 0.97 Mn 0.03 ) 5 (PO 4 ) 3 F 1- y Cl y samples present enhanced PL and X-ray excited optical luminescence intensities by factors of 1.6 and 7.4, respectively, and the corresponding optimal y values are determined to be 0.20 and 0.30. Fluorescence decay analysis found steadily shortened fluorescent lifetime for Mn 2+ at higher Mn 2+ and Cl − concentrations, and the underlying mechanism was discussed. The (Sr,Mn) 5 (PO 4 ) 3 (F,Cl) apatite material, with enhanced PL and X-ray excited optical luminescence, may find novel applications for both lighting and scintillating.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Panpan Sun,Taian Huang,Ziyu Chen,Liangyu Tian,Huihui Huang,Niu Huang,Sha Zhou,Min Long,Yihua Sun,Xiaohua Sun
The design and facile fabrication of highly efficient, cost-effective and earth abundant counter electrode material on an electrode surface is highly desirable for the application of dye-sensitized solar cells (DSSCs). Herein, using a N,N-dimethylformamide based solution process, transition metal chalcogenide Ni x S y films have been obtained by spin-coating a NiCl 2 -thiourea (Ni-Tu) solution combining mild thermal treatment. XRD, SEM and TEM characterizations reveal that the current procedure allows for phase composition (Ni 3 S 2 , NiS and NiS-NiS 2 ), crystallinity , morphology (film uniformity and compactness) control of the films through simple adjusting Ni/S ratio in the precursor solution. Electrochemical analysis indicates that the FTO supported Ni 3 S 2 and NiS films exhibit excellent electrocatalytic activity toward the reduction of triiodide, resulting in higher photo-electric conversion efficiencies of 6.86% and 6.95% when used as counter electrode in DSSCs, versus 6.66% for Pt. In particular, even without the support of conductive FTO layer, Hall effect measurements and electrocatalytic analysis reveal that pristine Ni x S y films exhibit good electrical conductivity and electrocatalytic activity, yielding a highest photo-electric conversion efficiency of 4.41% when used as counter electrode in DSSCs. Our study thus provides a facile procedure which allows for composition, morphology optimization and high performance for low-cost, large-scale DSSC application.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 19
·4001-4007
·
IF 3.858
Qingshuang Liang,Lin Han,Xiaolong Deng,Chuangang Yao,Junling Meng,Xiaojuan Liu,Jian Meng
In this paper, we report a facile, low-cost synthesis of Cu2Sn(SxSe1−x)3 colloidal nanocrystals (NCs) by heating a mixture of metal salts, sulfur powder, selenium powder, oleylamine and dodecanethiol. The composition of the Cu2Sn(SxSe1−x)3 NCs could be tuned across the x range from 0 to 1 by modulating the molar ratio of the S/Se precursors. The lattice parameters (a and c) of the Cu2Sn(SxSe1−x)3 NCs, calculated from X-ray diffraction patterns, were consistent with Vegard's law, confirming the formation of homogeneous nanocrystals. The X-ray diffraction and transmission electron microscopy results indicated that the as-prepared Cu2Sn(SxSe1−x)3 NCs had a monoclinic structure. The UV-visible absorption spectra of the Cu2Sn(SxSe1−x)3 NCs revealed that the band gap of the nanocrystals could be tailored from 1.55 to 1.87 eV by decreasing the Se content. Additionally, compared with the more commonly used hot injection method, the procedure developed here is highly suitable for large-scale colloidal nanocrystal production, which we tested by performing a gram-scale synthesis.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Huimin Zhang,Xiaoyan Guo,Wenhao Liu,Dengfeng Wu,Dong Cao,Daojian Cheng
Regulating catalyst composition is one of the efficient approaches to boost intrinsic activity of electrocatalysts for water splitting. Herein, four different hollow porous platinum-copper (PtCu) nanotubes (NTs) with controllable compositions were precisely fabricated by a facile wet-chemistry method. Importantly, Pt 5 Cu 2 NTs display the best hydrogen evolution reaction (HER) performance in all pH conditions compared to other samples, which just require overpotentials of 34 ± 2, 32 ± 2, and 284 ± 2 mV at 10 mA cm −2 in basic, acidic, and neutral solutions, respectively. Moreover, Pt 5 Cu 2 NTs also exhibit outstanding stability and corrosion resistance in all pH ranges. Then, mechanism analysis reveals that the electronic structure of Pt sites is regulated by changing the ratio of Pt and Cu, which directly optimizes the binding energy of reaction intermediates and promotes electron transfer during the HER process. In addition, a porous nanotube structure with countless nanoparticles on the surface provides a large number of active sites, enhancing the adsorption/desorption of reactants. This work emphasizes the importance of catalyst composition and provides a highly active potential HER catalyst for practical hydrogen production.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xiaowu Wang,Zhigang Zeng,Yu Fan,Xiaoer Wang,Shenghao Wang,Jiaqiang Xu
Sn 1−x S-CdS superlattice nanowires (NWs) with fast response and good selectivity in low-temperature operating environments for potential applications as gas sensing materials, were designed rationally and synthesized controllably. This work investigated in detail the dual selective gas sensing performance of Sn 1−x S-CdS superlattice nanowires that crystal facets change with the tunable composition . The results demonstrated that the Sn 0.38 S-CdS superlattice NWs with the structure of (0 0 4) lattice plane of SnS growing epitaxially along the [0 0 2] crystallization direction of CdS . And the gas sensors based on Sn 0.38 S-CdS superlattice NWs displayed the best gas sensing properties, including ultrafast response to acetone with 1 s at 290 °C, and good selectivity to H 2 S with selectivity value of 29886% at 190 °C. The gas sensing mechanism was carefully investigated by the chemical stability of gas molecules and the adsorption energy on the different crystal planes, as well as the energy band structure of the heterostructure . The study highlights an efficient rout to the development of high-performance multi-functional gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2023
·
IF 12.9
Dong Ji,Peng Guo,Yongjie Xi,Jinlei Li,Jia Wang,Tingting Wang,Fuwei Li
Selective tandem hydrogenation is a promising strategy for catalytic conversion of bulk raw materials with multifunctional groups into high-value-added chemicals via multiple-step reactions. Yet now, one of the current challenges is to develop a multifunctional and stable catalyst enabling the tandem catalysis rather than interrupting at any step reaction, particularly for supported nonprecious metal catalysts. In this work, we report tandem hydrogenation of bulk phthalic anhydride toward the one-pot synthesis of hexahydrophthalide, an emerging monomer of a recyclable polyester, over phosphorus-promoted Ni–Co bimetallic alloy nanoparticle catalysts. The surface composition of catalysts can be easily regulated by changing the Ni/Co molar ratio and the phosphorous functionalization strategy, which could then tune the product selectivity and enhance the stability of this tandem process. The optimal Ni3Co1@NC-P affords 88% selectivity for the desired product and demonstrates promising stability toward the tandem hydrogenation reaction. Systematic experimental and computational studies reveal that the adsorption strength of the intermediates and the ability of hydrogen activation can be altered by the formation of surface metallic Ni species, thus tuning the product selectivity. In addition, the oxidation resistance of Ni3Co1@NC-P was enhanced by the phosphorization treatment, which makes the bimetallic alloy successfully realize the tandem hydrogenation reaction. The finding of this work not only provides a convenient strategy to design and develop efficient and stable non-noble metal-based catalysts for selective tandem hydrogenation reactions, especially involving the hydrodeoxygenation reaction, but also fulfills the straightforward pathway for the preparation of degradable polyester monomer hexahydrophthalide.
研究领域:
催化化学
·
材料科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Wentao Guo,Jie Yuan,Xiulu Gao,Zhirui Wang,Meixia Zhang,Ling Zhao,Dongdong Hu
Biodegradable poly(butylene succinate -co- butylene adipate) (PBSA) was synthesized with varying adipic acid (AA) content via in-situ polymerization to systematically investigate the influence of chain segment composition on molecular structure, mechanical properties, foaming performance, and degradation behavior. Increased AA content enhances molecular chain flexibility, reduces crystallinity from 26.73% to 11.52%, and lowers the glass transition temperature ( T g ) from −37.0 ℃ to −51.2 ℃, thereby broadening the application window of PBSA in low-temperature environments. The incorporation of AA also widens the temperature window of supercritical CO₂ foaming, increasing the toughness and CO₂ solubility and reducing the strength of PBSA. Therefore, moderate incorporation of flexible segments can optimize the foaming properties of PBSA. PBSA foam with 40% AA content (A40) achieves a maximum initial expansion ratio of 55.3 and stable expansion ratio of 21.7. The degradation rate of PBSA foams was enhanced and the low-temperature applicability was broadened with increasing AA content. A40 foam(8 times) demonstrates superior compressibility at −45 ℃ and accelerate biodegradation (achieving 43.9% weight loss in soil within 8 weeks). This work highlights the potential of monomer ratio modulation in biodegradable bio-based polyesters to tailor foam properties for specific environmental and functional requirements, providing critical insights into the development of sustainable cushioning materials with tunable temperature applicability.
研究领域:
高分子科学
·
材料工程
·
环境科学
·
化学工程
·
生物降解材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）