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
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Juping Ma,Yan Sun,Fei Yu,Tianfeng Xue,Lili Hu
Tb 3+ ions doped optical materials have emerged as gain media for green fiber lasers. Dy 3+ ions were proposed as a sensitizer of Tb 3+ ions in glasses to increase the excitation efficiency, yet a systematic understanding of the impact of Dy 3+ doping on spectroscopic and physiochemical properties of glasses remains lacking. Here, using Tb 3+ /Dy 3+ doped fluoride glass as a model system, we reveal that Dy 3+ doping not only enhances Tb 3+ emission intensity, but also increases the thermal stability of fluoride glasses. Detailed spectroscopic characterizations indicate that co-doping Dy 3+ ions boosts visible luminescence intensity of Tb 3+ ions in fluoride glasses due to sensitization of Tb 3+ by Dy 3+ ions. Importantly, we deeply research the energy transfer process , ascertain several important factors affecting energy transfer efficiency and propose optimal doping concentrations of Tb 3+ and Dy 3+ ions for visible emission. We envisage that our finding provides a new perspective for the synthesis of Tb 3+ -doped fluoride glasses with enhanced thermal stability, and may be extended for the fabrication of Tb 3+ -activated optical fibers .
研究领域:
光学材料
·
无机非金属材料
·
光子学
·
稀土掺杂玻璃
·
光纤激光器
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Haoxiang Yu,Minghe Luo,Hua Lan,Lei Yan,Shangshu Qian,Wuquan Ye,Miao Shui,Nengbing Long,Jie Shu
The preparation and characterization of Pb 1- x Ba x Li 2 Ti 6 O 14 ( x = 0, 1/4, 1/2, 3/4, 1) as anode materials for lithium ion batteries are investigated in this research. The structure, morphology and electrochemical properties are compared with each other by changing the Pb/Ba atomic ratio in Pb 1- x Ba x Li 2 Ti 6 O 14 . It can be observed that each sample shows the same orthorhombic structure with Cmca space group. Moreover, it can also be found that the working potential, conductivity, cycling and rate performances of as-received samples gradually change along with the evolution of x in Pb 1- x Ba x Li 2 Ti 6 O 14 ( x = 0, 1/4, 1/2, 3/4, 1). Electrochemical evaluation shows that the operating potential of the as-received sample gradually decreases with increasing x value in Pb 1- x Ba x Li 2 Ti 6 O 14 and its initial charge capacity increases reversely. Moreover, different Pb/Ba atomic ratio also brings different cycling stability for Pb 1- x Ba x Li 2 Ti 6 O 14 . Especially for Pb 3/4 Ba 1/4 Li 2 Ti 6 O 14 , it presents better electrochemical properties than other samples. After 120 cycles, the reversible capacity of Pb 3/4 Ba 1/4 Li 2 Ti 6 O 14 is maintained at 129.7 mAh g −1 with capacity retention of 88.3%. In addition, its electrochemical reversibility is also demonstrated by in-situ X-ray investigation.
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
Advanced Energy and Sustainability Research
·
2021
·Vol. 2
·期 6
·2000095
·
IF 0
Jun Pan,Nana Wang,Dan Lv,Wujie Dong,Jian Yang,Fuqiang Huang
Sodium-ion batteries (SIBs), as next-generation energy storage devices, can be made by a similar production process to lithium-ion batteries (LIBs). The key to accelerating their commercialization is to discover appropriate high-performance electrode materials with low cost, nontoxicity, and simple synthetic features. Herein, layered-structure Na 2 Ti 3 O 7 , with the advantages of appropriate charge/discharge plateaus, superior stability, environmental friendliness, and ease of preparation using cheap raw materials, is selected for assembly in full-cell battery packs to evaluate its suitability for practical application. When evaluated in a coin cell, it has a capacity of 77.2 mAh g −1 at 1 A g −1 after 10 000 cycles with capacity retention of 99.9%, demonstrating its excellent stability. In the case of a soft-pack battery, it retains 22.3 mAh g −1 at 0.1 A g −1 and 18.1 mAh g −1 at 0.05 A g −1 after 50 cycles. After cycling, there is no sodium dendrite formation or active material shedding, further confirming its safety in practical application. Therefore, Na 2 Ti 3 O 7 as another intercalation/deintercalation mechanism material has application potential in the future.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）