Journal of Materiomics
·
2020
·
IF 5.797
Min Sun,Guowu Tang,Bowen Huang,Zhongjia Chen,Yu-Jun Zhao,Hanfu Wang,Ziwen Zhao,Dongdan Chen,Qi Qian,Zhongmin Yang
Bismuth telluride (Bi 2 Te 3 ) has attracted much attention in the field of thermoelectrics since it is one kind of commercial room-temperature thermoelectric material. Herein three kinds of Bi 2 Te 3 thermoelectric fibers with internal tensile stress are fabricated utilizing an optical fiber template method. The effects of internal stress on the microstructure and the electrical transportation of Bi 2 Te 3 thermoelectric fibers are investigated. The Bi 2 Te 3 cores in the fibers are highly crystalline and possess a tensile nanosheet structure with preferential orientation as evidenced by X-ray diffraction and Raman studies. Tensile stress can enhance electrical properties of the fibers. And a paper cup generator covered with 20 pieces of optimized fibers provides a μW-level output power. It is inferred that tensile stress tuning can be an effective tool for the material optimization of thermoelectric performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Luyao Ren,Liangzhong Li,Shuai Chen,Hui Li,Yongdi Liu,Liyang Zhou,Su Guo,YunJiang Yu
In this study, Fe/FeS@SiO 2 yolk-shell particles (Fe/FeS@SiO 2 YSPs) were synthesized, characterized, and applied to tetrabromobisphenol A (TBBPA) removal in simulated groundwater. The X-ray photoelectron spectroscopy, X-ray diffraction, Scanning electron microscopy, transmission electron microscopy and Brunauer Emmett Teller results revealed that Fe/FeS@SiO 2 YSPs possess special structures, including active cores, mesoporous networks, shells, hollow cavities and a large surface area (85 m 2 /g vs. 8 m 2 /g) compared to Fe/FeS. The mobility of the synthesized particles in porous media was simulated with sand column experiments. Fe/FeS@SiO 2 YSPs showed a much better transportability (83.02% of particles successfully transported through the column) than Fe/FeS particles (only 1.68%), related to the better suspension stability and much lower particle surface charge (−22.7 mV vs. −7.6 mV) at neutral pH. Improved TBBPA reduction performance in synthetic solution was observed for Fe/FeS@SiO 2 YSPs over bare Fe/FeS. The transformation pathway of TBBPA was studied in detail, revealing the formation of tri-BBPA, di-BBPA, mono-BBPA and BPA as the main products. In brief, thanks to the hollow mesoporous silica spheres (HMSS) coated on the surface of Fe/FeS particles, Fe/FeS@SiO 2 YSPs showed an enhanced dispersibility, transportability and degradation of TBBPA in simulated groundwater. The results in this study proved that Fe/FeS@SiO 2 YSPs are a promising material for in situ remediation of TBBPA in soil and groundwater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Zhiyuan Zuo,Jianxu Ding,Yongfu Li,Ying Zhao,Songjie Du
Organic–Inorganic hybrid perovskites attract intensive attentions due to significant optoelectronic performances. However, abnormal phenomena such as photocurrent hysteresis and slow photoconductivity response caused by ion migration made ionic transportation properties to be a hot topic in this area. Thinking of serious influences such as efficiency decay of excited carrier separation and poor reliability are caused by ion migration, systematical research on this topic is still highly demanded. Here, anisotropic ionic transportation performances of (100) and (112) planes in MAPbI 3 single crystal have been investigated with various photon excitation conditions. Enhanced ionic conductance had been extracted on (112) plane both with and without illuminations. Comparing to exponential saturation revealed by the electrons, the ionic conductance exhibits a linear increase trends with incident light power in MAPbI 3 .
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Yu Zhang,Won Hee Lee,Jong Geun Seong,Junming Dai,Shichao Feng,Yinhua Wan,Young Moo Lee,Yongbing Zhuang
The physical and gas transport properties of Tröger's Base (TB)-based polyimides (PI-TBs) synthesized by isomeric monomers were rarely reported. Here, a series of PI-TBs was synthesized from two iso -ether dianhydrides [4,4′-oxydiphthalic anhydride (4,4′-ODPA)/3,4′-oxydiphthalic anhydride (3,4′-ODPA)] and two iso -biphenyl dianhydrides [3,3′,4,4′-biphenyltetracarboxylic dianhydride (4,4′-BPDA)/3,4′-biphthalic anhydride (3,4′-BPDA)], with two diamines, 2,5-dimethyl-1,4-phenylenediamine (DPD) or 2,6-diaminotoluene (DAT). The solubility, microporosity, chain packing, mechanical performance and thermal stability, and gas transport properties were investigated for the PI-TBs derived from the isomeric dianhydrides. The polyimides derived from DPD and appropriate dianhydrides had better solubility and film-forming capability, mechanical properties , and higher gas permeability than those from DAT analogues. Furthermore, the polyimides based on different isomeric dianhydrides showed good solubility, mechanical properties, and high thermal stability and glass transition temperatures ( T g s), up to 400 °C. The chemical structures of isomeric dianhydrides have a noticeable influence on the chain packing and gas separation performance of the PI-TBs. The PI-TBs with rigid 3,4’-/4,4′-BPDA residues showed microporosity and their BET values in the range of 235.2–324.9 m 2 /g. The PI-TB membranes from the 3,4′-BPDA showed both higher gas permeability and selectivity (H 2 /CO 2 , H 2 /CH 4 , CO 2 /CH 4 ) compared to those from the 4,4′-BPDA. On the contrary, the PI-TB membranes from the 3,4′-ODPA had lower gas permeability with improved gas selectivity compared to those from the corresponding 4,4′-ODPA.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2017
·
IF 1.179
Tengyang Zhu,Xing Yang,Xiaoqi He,Yayun Zheng,Jujie Luo
A series of new aromatic polyamides (PAs) and copolyamides (CPAs) containing fluorene group have been synthesized through polycondensation reaction. The chemical structure was confirmed by Fourier transform infrared and proton nuclear magnetic resonance (1H NMR). PAs and CPAs exhibited the higher thermal stability (Td15 > 378°C in nitrogen), the higher glass transition temperature (Tg > 345°C), and excellent solubility in polar solvent. Gas transport properties of the PA and CPA membranes were investigated using different single gases (hydrogen (H2), carbon dioxide (CO2), oxygen (O2), methane (CH4), and nitrogen (N2)). We discussed the effect of chemical structure and operating temperature on gas transport properties. The results show that PA-1 containing a hexafluoroisopropylidene moiety exhibited the highest gas permeability (PH2 = 12.71 Barrer, PCO2 = 12.26 Barrer, and PO2 = 2.62 Barrer) and reasonably good selectivity (α(H2/N2) = 27.63, α(CO2/N2) = 26.65, and α(O2/N2) = 5.70) at 25°C and 1 atm. For all the membranes, gas permeability gradually increased with the increase in operating temperature, while the selectivity gradually decreased. These gas permeation results were well correlated with fractional free volume, interchain d-spacing (dsp), and intermolecular interaction.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiaoli Ding,Weiji Wang,Xianyun Cheng,Xiaoqian Fan,Hongyong Zhao,Qingping Xin,Yuzhong Zhang
Ether oxygen-rich polymeric membranes emerge as promising membranes in CO 2 separation due to the high affinity between CO 2 molecules and ethylene oxide segments. However, there is a massive challenge in developing asymmetric membranes with high CO 2 permeation performance and CO 2 /light gas separation performance. This work revealed composite membranes with ether oxygen-rich polyimide separation layers were developed by interfacial polymerization between 1,2,4,5-benzenetetracarbonyl tetrachloride and commercial diamines named o,o'-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol followed by thermal imidization. The influences of the polymerization time and monomer concentrations on the gas transport and separation properties of the composite membranes were studied based on single-gas permeation. The optimum membrane possessed a superior high ideal CO 2 /N 2 separation factor of 429 accompanied with a moderate permeance of 150 GPU for CO 2 at 25 o C and 0.2 MPa. The performance stability was studied by operating the membrane at various pressures and temperatures. The result showed the composite membrane possessed excellent plasticization resistivity at high pressures. The separation property of composite membranes for CO 2 /N 2 binary mixture was also evaluated. The influences of the operation parameters, including stage-cut and pressure ratio on the product purity and recovery were investigated. The results showed great practical application potential in efficient separation of flue gas .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanfang Tao,Yanyan Li,Meng He,Xiandong Zhao,Xiaojie Yang,Jinmao Li,Li Zhao,Yang Li,Shimin Wang
Sb 2 S 3 thin-film materials are regarded as promising candidates for next-generation thin-film solar cells due to their superior stability, simple chemical composition, cost-effectiveness, and excellent charge transport properties. In numerous studies, Sb 2 S 3 solar cells prepared with cadmium sulfide as the electron transport layer demonstrated high photovoltaic conversion efficiencies, mainly due to the key role of the CdS layer in optimizing the crystalline quality of Sb 2 S 3 thin films, regulating the crystal growth orientation, and enhancing the charge transport properties. Therefore, cadmium sulfide play a crucial role in determining the crystallinity, growth orientation, and charge transport performance of antimony sulfide films. Currently, the commonly used cadmium sources regarding the CdS preparation process are Cd(NO 3 ) 2 , CdSO 4 , CdCl 2 , and Cd(Ac) 2 . This study systematically investigates the effects of different Cd sources on the crystallization, morphology and charge transport properties of Sb 2 S 3 thin films. The results demonstrate that CdS prepared from Cd(NO 3 ) 2 significantly enhanced the crystallinity, grain morphology, band gap energy level, and photovoltaic performance of Sb 2 S 3 thin films, reaching a photovoltaic conversion efficiency of 4.23 %, which provides a solid foundation for further optimization and improvement of Sb 2 S 3 solar cells.
研究领域:
薄膜太阳能电池
·
材料科学
·
光伏技术
·
半导体材料
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2016
·
IF 1.045
Guangliang Song,Lina Wang,Dandan Liu,Jianan Yao,Yiming Cao
A series of polyimide (PI) membranes were prepared based on three triphenylamine-based diamines, namely 4,4′-diaminotriphenylamine, 4,4′-diamino-3′′,5′′-dimethyltriphenylamine, and 4,4′-diamino-3′′,5′′-ditrifluoromethyltriphenylamine, via thermal imidization procedure. The PI membranes displayed good thermal properties, with glass transition temperatures of 279–341°C and 5% weight loss temperatures above 515°C under a nitrogen atmosphere. The gas permeation properties of the membranes were investigated and interpreted from the viewpoint of the PI backbone structure. The gas permeation coefficients increased as the substituent pendant groups at the 3′′,5′′ positions of the triphenylamine varied from –H to –CH3 and –CF3, and the permselectivity of gas pairs (including hydrogen/nitrogen (N2), oxygen/N2, carbon dioxide (CO2)/N2, and CO2/methane) decreased in this order. The diffusion coefficients and solubility coefficients were calculated, and the results revealed the variation of the substituted triphenylamine units principally influenced the diffusion coefficients, indicating that the substituted triphenylamine affected the gas transport properties by “diffusivity-controlled” modification.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yi-Xin Zhang,Yun-Qiao Tang,Zheng Ma,Ming-Yu Hu,Jing Feng,Zhen-Hua Ge
In this study, Cu2Se1–xSx (x = 0.1, 0.3, and 0.5) alloy powders were prepared by the hydrothermal synthesis method. In the subsequent sintering process, the spontaneous in situ phase separation process of the sample forms a two-phase hybrid structure. The generated Cu2S precipitates in the Cu2Se matrix noticeably enhance phonon scattering, which is beneficial for low thermal conductivity without significantly affecting the electrical transport performance. Ultimately, an optimized thermoelectric performance was obtained in Cu2Se0.9S0.1, reaching a peak zT value of 1.43 at 773 K, the optimum value among the Cu–Se–S systems at this temperature.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Guozhen Liu,Renhao Li,Xi Chen,Long Cheng,Yu Liu,Gongping Liu,Wanqin Jin
Carbon molecular sieve (CMS) membranes with exceptional separation performance and scalable processing are promising for precise gas separation. However, their broad applicability is hampered owing to stability issues, mainly resulting from physical aging. Herein, we manipulate the pyrolysis temperature (550 °C, 650 °C and 750 °C) to regulate the gas transport properties and control the physical aging of CMS membranes derived from 6FDA-DAM polyimide. The morphology, chemical composition and pore size of the membranes were characterized using SEM, IR, XPS and XRD. Results demonstrated that the pore structure of CMS membranes shows densification with increasing the pyrolysis temperature, affording enhanced separation efficiency for gas pairs: H 2 /N 2 , H 2 /CH 4 , and CO 2 /CH 4 pairs based on the size-sieving effect. Moreover, the effect of aging is more considerable for membranes pyrolyzed at a higher temperature. In addition, the membrane subjected to pre-aging treatment via vacuum storage exhibit better, stable gas separation performance beyond the upper-bond for polymeric membranes. The separation mechanism of the CMS membranes reveals that gas permeation behavior is dominated by diffusion. Tailoring gas permeation and physical aging can provide an alternative approach to tune the gas transport properties of CMS membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Ye,Yixuan Feng,Pengkai Shan,Bin Qian,Lin Ge,Han Chen,Yifeng Zheng
Reversible solid oxide cells (RSOCs) have attracted considerable interest due to their efficient energy conversion. However, the low catalytic activity of air electrodes limits the application of RSOCs. Bi 0.5 Sr 0.5 Fe 0.9 Ta 0.1 O 3-δ developed in our previous work exhibits a comparatively desirable performance and is expected to be further optimized. Herein, a novel strategy of anionic F and cationic Ta co-doped Bi 0.5 Sr 0.5 Fe 0.9 Ta 0.1 O 3-δ-x F x (x = 0, 0.05, 0.10, 0.15, denoted as, BSFTF0, BSFTF5, BSFTF10, BSFTF15) materials are obtained to enhance the oxygen transport property of Bi 0.5 Sr 0.5 FeO 3-δ for RSOCs. The polarization resistance (Rp) of BSFTF10 (0.017 Ω cm 2 ) decreases by 66 % compared with that of BSFTF0 (0.051 Ω cm 2 ) at 800 °C. In fuel cell mode, the single cell with BSTF10 reaches the maximum power density of 908 mW cm −2 , which is approximately 72 % higher than the only Ta-doped BSFTF0 (527 mW cm −2 ) at 800 °C. In electrolysis mode, the single cell with BSFTF10 exhibits a high electrolysis current density of 1679 mA cm −2 , indicating an approximately 90 % increase compared to that of BSFTF0 at 800 °C and 1.5 V with 70 % CO 2 -30 % CO feed gas. The bulk chemical diffusion (D chem ) of BSFTF10 is up to 5.12 × 10 −4 cm 2 s −1 , which is 4.3 times higher than that of BSFTF0. The superior oxygen transport property of BSFTF10 is attributed to the high electronegativity of F − (4.0) and low electronegativity of Ta 5+ (1.8), which may weaken the chemical bonding between B-site ions and O 2− , generating more oxygen vacancies and accelerating the rate of oxygen transfer. The results indicate that F and Ta co-doping is an effective strategy to develop a highly catalytically active air electrode for RSOCs featuring oxygen transport properties.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Jiao Huang,Dongyun Wang,Yongyuan Ren,Xiao Xu,Xiao Han,Fanqun Li,Xiaoli Zhan,Qinghua Zhang
Nowadays, in the transition stage between the liquid electrolyte and solid electrolyte, the lean electrolyte strategy developed based on ceramic-polymer composite electrolytes (CPEs) has important practical significance to make up for their shortcomings and realize coordinated improvement of safety performance and electrochemical performance. However, the lean electrolyte CPE system is seriously limited by the contradiction between ion transport and swelling of polymer components in CPEs in practical applications. Polymers with high ionic conductivity tend to absorb the few liquid electrolytes and subsequently swell, resulting in reduced electrode wettability and electrical properties, while polymers that do not swell usually have poor ionic conductivity, reducing the intrinsic conductivity of CPEs. Herein, a binary solvophilic/solvophobic polymer network of CPEs is constructed under lean electrolyte condition. As a solvophilic segment, the urea-functionalized poly(propylene oxide) can not only improve the Li+ transport capacity but also form hydrogen bonds with the fluorine on the solvophobic poly(vinylidene fluoride-co-trifluoroethylene) (PVDF–TrFE) segment, thereby forming a hydrophobic composite network at the molecular scale. Then, the epoxidized Li1+xAlxTi2–x(PO4)3 (LATP) is further cross-linked with the urea amino groups on the polymer chain. This can significantly inhibit swelling and improve the ion transmission performance, endowing lithium-metal batteries with excellent electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 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）