OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiajie Pan,Youjie Hua,Zhanhao Fan,Hongping Ma
Far-red light plays a crucial role in the field of plant lighting. Herein, a novel far-red phosphor BaAl 2 Si 3 O 4 N 4 : Sm 2+ , which can be effectively excited by blue light, was successfully prepared by high-temperature solid-state reaction. The PL spectrum show a broadband emission range from 600 nm to 950 nm (FWHM = 120 nm), which is well matched with the absorption of P FR in plant. In BaAl 2 Si 3 O 4 N 4 : Sm 2+ , the Ba 2+ are coordinated with three N and six O atoms. When the rare earth ion of Sm 2+ was doped into the host lattice , Ba 2+ was partially replaced by Sm 2+ . The low temperature PL spectra at 8–80 K were studied in detail. It was found that the PL spectra at low temperature were composed of some sharp lines and broadband superposition, which corresponding to the 5 D 0 - 7 F J (J = 0–4) energy level transition of Sm 2+ . It is shown that the broadband emission of the phosphor was caused by the broadening of the 4f 5 5 d 1 energy level due to the strong crystal field effect. The thermal stability analysis showed that the luminescence intensity of BaAl 2 Si 3 O 4 N 4 : Sm 2+ at 150 °C still maintains 62.7 % of that at room temperature , showing excellent thermal stability. All results indicate that BaAl 2 Si 3 O 4 N 4 : Sm 2+ phosphor has important potential applications in the field of plant lighting.
研究领域:
材料科学
·
光电子学
·
农业光学
·
无机化学
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Yuan Jin,Xiu Zhang,Tianci Feng,Meisheng Li,Huifang Xiao,Shouyong Zhou,Yijiang Zhao,Jing Zhong,Dawei Yang
Low ion conductivity and poor alkali resistance are still the two major obstacles for the applications of anion exchange membranes (AEMs). In this work, the combined strategies of Carbon quantum dots (CQDs) hybrid and cross-linking modification via side-chains designing were employed to prepare organic–inorganic hybrid AEMs. Then, the cross-linked quaternized polysulfone (CQPSf-CQDs) hybrid AEMs by incorporating carbon quantum dots were successfully fabricated. After hybrid and cross-linking, the mechanical properties of CQPSf-CQDs hybrid AEMs were higher than that of the pristine one, reaching 49.4 MPa for the best one. Meanwhile, the existence of CQDs can expand the hydrophilic area in the membrane, which is beneficial to the transport of O H - . The incorporated CQDs interact weakly with cationic groups in the side chains through hydrogen bonds. The simulation results further demonstrated that the introduction of CQDs was beneficial to the construction of hydrophilic and hydrophobic domains, thereby increasing O H - conductivity. In addition, the prepared hybrid membranes own excellent dimensional stabilities and ion transport performances. These preliminary results give us a lot of hopes for further experiments and optimizations for the hybrid AEMs.
研究领域:
材料科学
·
高分子化学
·
膜科学与技术
·
电化学
·
能源材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Jing Lin,Lianshan Sun,Zhanyi Cao,Dongming Yin,Fei Liang,Yaoming Wu,Limin Wang
We describe our recent progress on a novel method to prepare Ti 1.4 V 0.6 Ni hydrogen storage alloy covered with nanostructured Co 3 O 4 by utilizing zelolitic imidazolate framework 67 (ZIF-67) as the template. Ti 1.4 V 0.6 Ni@C@Co 3 O 4 composite is prepared through a dopamine self-polymerization and a facile precipitation reaction with the subsequent thermal treatment. This specific composite structure combines the high conductivity of carbon together with the promising catalytic property of nanostructured Co 3 O 4 , therefore the enhanced electrochemical activity and stability are realized. As a result, Ti 1.4 V 0.6 Ni@C@Co 3 O 4 composite electrode possesses a capacity conservation rate of 56.1% after 300 charging/discharging cycles, remarkably larger than that of Ti 1.4 V 0.6 Ni (25.3%). Moreover, a study of the kinetics demonstrates that nanostructured Co 3 O 4 coating accelerates the charge-transfer reaction of the electrode. These results prove that coating with carbon and nanostructured Co 3 O 4 is a potential method for enhancing electrochemical hydrogen storage properties of hydrogen storage alloys.
研究领域:
材料科学
·
电化学
·
能源存储
·
金属氢化物电池
·
纳米材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
J. LUO,J.X. Liu,F.M. Xiao,L. Huang,W.C. Li,R.H. Tang,Q. Zhou,Y. Wang
In order to restrain the capacity decay of nickel-rich materials for lithium-ion batteries (LIBs) in advanced energy applications, a Ni-rich cathode (LiNi 0.88 Co 0.07 Al 0.05 O 2 , LANCA) with high-rate capability and cycle life was designed and prepared by coating γ-LiAlO 2 and doping Al 3+ on the surface and inside of the secondary particles, respectively. Specifically, the γ-LiAlO 2 -coated and Al 3+ -doped LANCA samples were synthesized by a simple strategy of pre-coating Ni 0.88 Co 0.07 Al 0.05 (OH) 2 , based on aluminum isopropoxide hydrolysis combined with a post-sintering lithiation process. With the γ-LiAlO 2 and Al 3+ , the capacity retention ratio of the cathode is tremendously improved from 61.7 to 83.6% at 1 C rate after 100 cycles. Even at a heavy current density of 10 C for the LANCA cathode, a high reversible capacity of 154.4 mA h g − 1 can be acquired, which amount to the 82.5% capacity retention at 0.2 C. Detailed morphology and structure observation shows that the side reaction at the electrolyte-cathode interface was suppressed, the structural degradation and intergranular cracking were suppressed, while the diffusion of Li + and conductivity were improved. Therefore, this ingenious structural design has certain reference significance for the development and commercialization of high-performance cathode materials for electric power.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Sai-Li Zheng,Yonghe He,Xiao-Kang Qiu,Yuan-Hui Zhong,Lai-Hon Chung,Wei-Ming Liao,Jun He
A novel metal-organic framework [CuCN(TMBP)·H 2 O] n ( TCuCN ) has been synthesized by the reaction of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (TMBP) and CuCN. Its structure was determined by single-crystal X-ray diffraction (SCXRD) analysis and further characterized by power X-ray diffraction (PXRD) analysis, FT-IR spectroscopy and thermogravimetric (TG) analysis. Previously reported structurally analogous TCuCl , TCuBr , TCuI have also been synthesized for Br 2 adsorption comparison. All of these four MOFs exhibited reversible uptake of Br 2 vapor judging by the unchanged PXRD patterns . Among four MOFs, Br 2 -loaded TCuI showed the most uptake amount of Br 2 (15.7 wt%), providing the formula to be TCuI ·0.33Br 2 . The different uptake amount of Br 2 for TCuX (X = CN, Cl, Br, I) should be mainly ascribed to the intermolecular interaction between CuX and Br 2 .
研究领域:
无机化学
·
材料化学
·
配位化学
·
多孔材料
·
气体吸附
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1492-1500
·
IF 1.174
Zhang Nan,Fan Yu-Hua,Bi Cai-Feng,Zhang Xia,Zhang Peng-Fei,Zhang Zhong-Yu,Li Xin
Three novel transition metal coordination polymers, [Ni(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 1 ), [Zn(C 18 H 16 N 3 O 2 ) 2 ·4CH 3 OH]
n
( 2 ) and [Cd(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 3 ) (C 18 H 16 N 3 O 2 =2-acetylpyridine- d -tryptophan) were synthesized and characterized by elemental analysis, IR, UV, 1 H NMR and X-ray diffraction single crystal analysis. The analyses of the structures indicate that all three materials crystallize in the tetragonal crystal system, space group P 4 1 2 1 2. They have similar structures; i.e., the Schiff base coordinates in its deprotonated form and behaves as a hexadentate (4N+2O) coordinated ligand to form a distorted octahedron geometry. On the other hand, as a result of the alternate arrangement of chains through N–H···O intermolecular hydrogen bonds interactions, 2-D layers are formed for the three complexes. Furthermore, the luminescent properties and thermal stabilities of the three complexes were investigated.
研究领域:
无机化学
·
配位化学
·
材料化学
·
晶体工程
·
光物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 30
·1965
·
IF 2.8
Wei Lianghuan,Dong Tianhao,Cui Yongpeng,Zhu Shengjie,Si Jianxiao
One potential application for flexible thermoelectric (TE) devices based on inorganic ductile fiber materials is the development of self-powered wearable electronics. In the work, the molten drawing method was employed for fabricating inorganic ductile Ag 2 S 0.7 Te 0.3 fibers. The output voltage and maximum output power of the single fiber are 3.3 mV and 837.4 nW, respectively, under a temperature difference of 50 K. The Ag 2 S 0.7 Te 0.3 fiber shows outstanding stability performance in the service stability test with a critical electric density of 36 A cm −2 and exhibits a tensile strain of 5%. The high temperature sensitivity of the Ag 2 S 0.7 Te 0.3 fibers TE device demonstrates the application potential in wearable electronics products.
研究领域:
材料科学
·
纳米科技
·
能源材料
·
柔性电子学
·
热电转换
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 10
·4567-4576
·
IF 2.289
Xu Chun-Sheng,Yu Hai-Tao,Guo Chen-Feng,Xie Ying,Ren Ning,Yi Ting-Feng,Zhang Guo-Xu
To improve the stability and performance of the cathode materials, an ionic conductor layer was coated successfully on the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNC) microspheres. The structural analysis confirmed that LiV 3 O 8 coating did not change the basic structure of LMNC, and all obtained materials are solid solutions with a good-layered structure and a good crystallinity. The microscopy measurement showed that the thickness of the coating layer for the LV-3 sample is about 2.5 nm. This appropriate layer is helpful for improving the surface stability of LMNC and the diffusion of lithium, leading to an obvious enhancement of the electrochemical performance. Our result confirmed that the average discharge specific capacities for LV-3 sample at 0.1 C, 0.2 C, 0.5 C, 1 C, and 3 C are respectively 265.9, 219.1, 188.0, 156.3, and 121.5 mAh g −1 , which are much larger than the values of other samples. After 50 cycles at a 1 C rate, the capacity retentions for different samples are 60.7%, 74.0%, 87.6%, and 70.4%, indicating that LV-3 sample exhibits the best performance. Furthermore, EIS measurements showed that the diffusion coefficient for LV-3 sample is calculated to be 1.26 × 10 −15 cm 2 s −1 , which is also the largest value among all considered samples. Our experiments identified that coating an ionic conductive layer on the cathode material surface will significantly improve their rate capacity and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态离子学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Lvlv Ji,Lei Zhu,Jianying Wang,Zuofeng Chen
A self-supported copper sulfide (CuS) nanowire array (NWA) of hierarchical and porous structure has been developed on Cu foil via two consecutive liquid-solid reactions at room temperature. The composition, structure and morphology of the as-prepared CuS NWA samples have been systematically investigated by a series of techniques. When applied as cathode for the hydrogen evolution reaction (HER) in neutral solution, the optimized CuS NWA electrode exhibits excellent HER performance with high long-term stability. To achieve current densities of 10 and 100 mA cm −2 , it requires overpotentials of only ∼97 and ∼226 mV, respectively. The excellent catalytic performance of CuS NWA toward HER is attributable to the binder-free electrode construction strategy, the unique porous nanowire array structure, and the small solubility product ( K sp ) value of CuS that guarantees the high catalyst stability.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·Vol. 43
·期 10
·2100-2107
·
IF 5.2
Jing Yan,Junyu Hong,Xiaohui Li,Bojana Milićević,Lei Zhou,Chunyan Jiang,Mingmei Wu
Nowadays, high-quality phosphor-converted white light-emitting diodes (pc-WLEDs) ought to include cyan-emitting phosphors allowing for full-spectrum light similar to sunlight. Herein, we report a garnet-structured Ce 3+ -doped SrLu 2 Ga 1.5 Al 2.5 SiO 12 (SLGASO) phosphor that significantly compensates for the absence of cyan light, known as the “cyan cavity”. The SLGASO host crystallizes into a cubic structure with the I a 3 ¯ d space group. The cell parameters were determined using Rietveld refinement. Under 430 nm blue excitation, SLGASO:Ce 3+ emits intense cyan-green light in the 450–700 nm wavelength range. The representative SLGASO:0.07Ce 3+ phosphor has an internal quantum efficiency (IQE) of 95.4% and excellent thermal stability, remaining 92.7% of its initial emission intensity at 152 °C. After 155 d of immersion in water, the luminous intensity of SLGASO:0.07Ce 3+ remains constant, confirming its waterproofness. Furthermore, a pc-WLED device with luminous efficiency (LE) of 101.58 lm/W, color rendering index ( Ra ) of 91, correlated color temperature (CCT) of 4536 K, and Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.3555, 0.3390) was fabricated by combining as-prepared cyan-green-emitting SLGASO:0.07Ce 3+ , yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ), and red-emitting (Ca,Sr)AlSiN 3 :Eu 2+ phosphors, as well as a 450 nm blue chip. These findings indicate that SLGASO:0.07Ce 3+ phosphor can bridge the cyan gap and improve the performance of as-fabricated full-visible-spectrum WLEDs.
研究领域:
材料科学
·
光学材料
·
固态照明
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2016
·
IF 2.421
Changqing Fang,Xin Yu,Ruien Yu,Pei Liu,Xiaoting Qiao
Isocyanate modified asphalt samples were got by adding quantitative isocyanate into the base asphalt. Isocyanate and nano particles composite modified asphalt samples were produced by adding quantitative isocyanate and three different kinds of inorganic nanoparticles (Silicon dioxide, Titanium dioxide, Zinc oxide) into the base asphalt respectively. Isocyanate modified asphalt, isocyanate and nanoparticles composite modified asphalt were characterized by taking physical tests, SEM, fluorescence microscopy, TG and FTIR tests, which demonstrated that the high and low temperature performance of isocyanate and nano particles composite modified asphalt had been improved effectively. From the microscopic view, the modification of the base asphalt was very significant. Results also indicated that the temperature sensitivity of composite modified asphalt had been decreased. Meanwhile, the thermal stability had been improved when compared with the base asphalt and isocyanate modified asphalt.
研究领域:
材料科学
·
道路工程
·
高分子化学
·
纳米技术
·
应用化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 7
·3111-3118
·
IF 3.069
Lulu Pan,Jianfeng Ban,Li Ren,Zuocai Zhang,Qingyuan Peng,Shaorong Lu
This paper aims at elucidating the influence of liquid crystals (LCs) on the properties of shape memory polymers. A novel series of liquid crystalline shape memory polyurethanes, named LC-SF-SMPUs were successfully prepared by chemically cross-linking polyester sisal fibre cellulose (PSF) with polycaprolactone (PCL) and 4,4′-di(6-hydroxyhexyloxy)biphenyl (BP6). The effect of BP6 on the morphology and properties has been carefully investigated. The results show that the cross-linking structures provided a stable network, high elasticity and good thermal stability to the LC-SF-SMPUs, and demonstrate that the obtained LC-SF-SMPUs not only maintained the LC property of BP6, but also enhanced the intrinsic crystallization of PCL. Thus, the LC-SF-SMPUs showed excellent multi-shape memory properties with two crystalline transition temperatures. In the triple-shape memory effect of LC-SF-SMPUs, the first step of strain recovery is associated with the melting transition of the soft segment crystals of the polyurethane matrix, and the second step of strain recovery results from the melting transition of the LC mesogen. The strain fixity improved with increasing BP6-content, due to the enhanced crystallinity. However, the total strain recovery decreased as a result of the lubrication of the BP6 chains. This work demonstrates a new combination of LC properties and multi-shape memory properties, which makes it ideal for many potential applications in new smart devices.
研究领域:
高分子材料
·
智能材料
·
功能高分子
·
形状记忆聚合物
·
生物基材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）