JOM
·
2022
·Vol. 74
·期 5
·1934-1944
·
IF 2.597
Liu Peiwen,Fei Zitong,Zhang Yingjie,Dong Peng,Meng Qi,Yang Xi
Developing a green and efficient approach for recovering Li from cathode materials is important in recycling spent LiFePO 4 batteries. A facile and efficient oxidation process was developed to selectively recover Li from spent LiFePO 4 batteries. The common oxidant NaClO was used to avoid using acid or alkali in the leaching process. The leaching rate of Li reached 99.8% under the selective optimal leaching conditions of 0.54 mol/l NaClO, leaching time 60 min, leaching temperature 60°C and solid–liquid ratio 1 g/l. The high leaching efficiency can be ascribed to the combination of oxidability and high pH value of the NaClO solution. Meanwhile, leaching and precipitation were carried out simultaneously in this process, which promoted the leaching reaction. High performance LiFePO 4 /C was resynthesized using the recovered products. The specific capacity of the first discharge at 1 C was 147.1 mAh/g and the capacity retention rate at 1 C was 97.55% after 200 cycles. The oxidation approach is acid free and has low energy consumption for green recovery of spent LiFePO 4 batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11202-11214
·
IF 4.682
Liu Linxiang,Zhang Jiaqi,Shi Ge,Zhang Huili,Wang Bing,Zhong Linxin
Recently, wearable electronic devices and human–computer interaction are developing prosperously, which expands the requirement of flexible sensing materials. Graphene and its derivatives with extraordinary advantages are highly attractive precursors. However, it is difficult to assemble graphene into macroscopic cubes with good fatigue resistance performance. Here, we propose an efficient way to manufacture a lamellar-structural rGO aerogel with enhanced stiffness and deflection of lamellae, by using MXene as a rigidity additive. The addition of MXene (Ti 3 C 2 T x ) improves the mechanical and fatigue resistance properties of the aerogel, making it super compressible and elastic. The highly stable structure of the aerogel can withstand extremely high compressive strain of 90% and long-term compression at 50% strain for at least 10,000 cycles. The lamellar structure makes a great contribution to achieve good sensing performance including high linear sensitivity, low testing limit, wide testing strain range and quick response. These features make the MXene/rGO aerogel a promising sensing material for flexible wearable devices to monitor the subtle and obvious biosignals of the human body movement. Graphical abstract
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 4
·1949-1954
·
IF 1.938
Zhang Dunpu,Zhen Yue,Chang Qing,Zhang Hui
Highly crystalline β-NaLuF 4 :Ln 3+ microstructures were successfully prepared via a mixed NaCl-KCl flux cooling approach. The chemical reaction process and the formation mechanism have been carefully investigated by XRD, SEM, TEM and PL characterizations. Interestingly, as the reaction time is prolonged, the crystalline structure of NaLuF 4 changes from α-phase to β-phase, while the granule shape transfers from nanoparticles to solid microsheets then to porous microsheets. By altering the kinds of doped lanthanide ions, upconverting and downconverting luminescence with multi-colour outputs (red, green and blue) can be realized in β-NaLuF 4 :Ln 3+ (Ln = Yb, Er, Tm, Ce, Tb and Eu). This strategy is not only expected to meet the ever-increasing commercial demand, but also offers an alternative in synthesizing rare earth fluorides.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 21
·18360-18369
·
IF 2.22
Wang Mengmeng,Tao Yueming,Zhang Dongyun,Sun Guanghan,Feng Ping,Chang Chengkang
Na 3–2 x Mg x V 2 (PO 4 ) 3 /C (0 ≤ x ≤ 0.2) were synthesized by a sol–gel method. According to X-ray diffraction (XRD) Rietveld refinement and energy dispersive spectroscopy (EDS) mapping results, Mg ions were approved to occupy the Na2 (18e) site in Na 3–2 x Mg x V 2 (PO 4 ) 3 /C for the first time. The amount of Mg substitution in Na 3–2 x Mg x V 2 (PO 4 ) 3 /C was optimized. The specific discharge capacities of Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C at 10 C, 20 C, and 30 C were 98.9%, 91.5%, and 76.2% of the value obtained at 1 C, respectively. Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C exhibited the highest capacity retention of 80.3% with a discharge capacity of 77.3 mAh·g −1 after 1200 cycles at 10 C. Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C exhibited superior rate performance, resulting from a high sodium diffusion coefficient ( D Na ) of 3.91 × 10 –12 cm 2 ·s −1 and the excellent electrical conductivity (5.7 × 10 –2 s·cm −1 ). Combining the X-ray photoelectron spectroscopy (XPS) and Electrochemical impedance spectroscopy (EIS) results, the mechanism of Mg substitution was investigated. Since two Na + were replaced by one Mg 2+ , \({\mathrm{V}}_{\text{Na}}^{^{\prime}}\) was produced to maintain valence equilibrium. This phenomenon benefited Na + migration by broadening the diffusion channel in the structure of Na 3 V 2 (PO 4 ) 3 . According to the EPR results, the signal intensity of Na 2.9 Mg 0.05 V 2 (PO 4 ) 3 /C was much stronger than that of Na 3 V 2 (PO 4 ) 2 /C, thus confirming the existence of \({\mathrm{V}}_{\text{Na}}^{\mathrm{^{\prime}}}\) after Mg substitution. When the amount of Mg substitution was further increased to 0.1, the D Na decreased because of the small radius of Mg 2+ , which led to severe lattice distortion and volumetric shrinkage of the unit cell.
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高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 10
·1277-1287
·
IF 1.967
Liu Cuicui,Zhao Buyi,Liu Xiaobing,Zhang Ailin
A novel capillary electrochromatography method has been developed for the simultaneous quantification of ten benzimidazole fungicides in fruits. Herein, covalent organic frameworks (COFs) and ionic liquids (ILs) were successfully introduced to prepare open-tubular capillary column to improve the loading capacity and separation performance. The parameters effecting the analytical performance including pH and concentration of running buffer, separation voltage and the addition of organic solvent were investigated systematically. Under the optimized conditions, the method allowed the baseline separation of ten benzimidazole fungicides, and showed a good linearity in the range of 3.5–200 μg kg −1 with the detection limits between 1.0 and 2.8 μg kg −1 . The intraday and interday precisions for recoveries were lower than 7.9% and 12.2%, respectively. Intraday and interday precisions for their retention times were lower than 3.2% and 6.6%, respectively. Satisfactory recoveries for grape, pear and orange samples at two concentrations were obtained ranging from 85.0 to 95.9% with RSDs lower than 7.8%, demonstrating the potential applications of the open-tubular capillary electrochromatography method for trace benzimidazole fungicides analysis in fruits. Graphical abstract
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高影响因子
Science China-Chemistry
·
2021
·Vol. 64
·期 7
·1184-1191
·
IF 9.445
Gao Mengen,Wu Hongping,Yu Hongwei,Hu Zhanggui,Wang Jiyang,Wu Yicheng
Deep-ultraviolet (UV) nonlinear optical (NLO) crystals with excellent performances are of great importance in laser science and technology. However, to design and synthesize an ideal deep-UV NLO material with a balance between second harmonic generation (SHG) response and UV cut-off edge is still a huge challenge. Herein, a new oxy-borate BaYOBO 3 (BaYBO) was designed and synthesized by substituting Be 2+ with Y 3+ from Sr 2 Be 2 B 2 O 7 . The BaYBO features a stable three-dimensional framework and satisfies the property balance between a large SHG response (~2.6×KH 2 PO 4 (KDP)) and a short UV cut-off edge (<190 nm) as a promising deep-UV NLO candidate. The study of structure-property relationship indicates that the large SHG response of BaYBO is mainly attributed to the coplanar arrangement and large number density of BO 3 triangles. These results demonstrate that substituting Be 2+ with Y 3+ cations is also a feasible strategy for developing new deep-UV NLO crystals.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 27
·21737-21745
·
IF 2.779
Lin Feng Li,Liu Bing,Song Kai Xin
NaLaMgWO 6 microwave dielectric ceramics have been synthesized via the standard solid-state reaction method. The Rietveld refinement of the X-ray diffraction patterns indicates that NaLaMgWO 6 crystallizes in a monoclinic crystal structure with a C 2/ m space group. Raman spectrum of the NaLaMgWO 6 ceramic is collected, and the correlations between the Raman active modes and chemical bond vibrations are systematically identified. The optimum microwave dielectric properties are obtained when sintered at 1550 °C, with ε r = 17.1, Q f = 26,150 GHz, and τ f = − 83.4 ppm/°C. A microstrip patch antenna operating at the sub-6 GHz band is fabricated using the NaLaMgWO 6 ceramic as the substrate. The fabricated antenna resonates at 3.82 GHz, which exhibits an excellent S 11 value of − 26 dB, a minimum VSWR value of 1.07, and a satisfactory simulated efficiency of 72.2%. The good antenna performance demonstrates the great application potential of NaLaMgWO 6 ceramic in the sub-6 GHz band antennas.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 8
·1-12
·
IF 4.3
Chun Weilong,Yang Chenbiao,Wang Xu,Yang Xin,Chen Huiyong
A facile synthesis of hierarchical ZSM-5 with the three-dimensionally ordered mesoporosity (3DOm ZSM-5) was achieved by solid conversion (SC) of SiO 2 colloidal crystals to high-crystalline ZSM-5. The products of 3DZ5_S/C and 3DZ5_S, which were severally transformed from the carbon-padded SiO 2 colloidal crystals and the initial SiO 2 colloidal crystals, exhibited not only a similar ordered structure and acidity but also higher crystallinity and more balanced meso-/micropore combination in comparison with 3DZ5_C obtained by the conventional confined space crystallization approach. All three synthesized 3DZ5 catalysts showed improved methanol-to-propylene performance than the commercially microporous ZSM-5 (CZ5), embodied in five times longer lifetime, higher propylene selectivity and S propylene / S ethylene ratio ( P/E ), and superior coke toleration with lower formation rate of coke ( R coke ). Moreover, the 3DZ5_S catalyst in situ converted from SiO 2 colloidal crystals presented the highest selectivities of propylene (42.51%) and light olefins (74.6%) among all three 3DZ5 catalysts. The high efficiency in synthesis and in situ utilization of SiO 2 colloidal crystals demonstrate the proposed SC strategy to be more efficiently and eco-friendly for the high-yield production of not only 3DOm ZSM-5 but also other types of hierarchical zeolites.
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高影响因子
Science China-Materials
·
2020
·Vol. 64
·期 3
·592-600
·
IF 6.098
Wang Wei,Borse Rahul Anil,Xie Jiafang,Wang Yaobing
The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction (CDRR) is of great significance to the virtuous cycle of carbon dioxide. However, due to the high overpotential involved in this reaction, high power consumption and high-cost noble-metal-based catalysts are required for driving this process. Herein, the electrochemical CDRR was achieved on biocompatible metal-free nitrogen, phosphorus co-doped carbon-based materials (NP-C) in the microbial fuel cell-microbial electrolysis cell (MFC-MEC) coupling system. As the bioelectrochemistry in MFC supplied power to drive the electrocatalysis in MEC, syngas was spontaneously produced from this coupling system without external energy input. With the NP-C materials as the excellent bifunctional electrocatalyst for the CDRR and oxygen reduction reaction (ORR), the current density of the MEC reached −0.52 mA cm −2 , and the Faradaic efficiencies (FEs) of CO and H 2 were 60% and 40%, respectively, at a load resistance of 10 Ω. Moreover, the CO/H 2 product ratio can be changed by adjusting the load resistance, which will widely meet various demand of syngas usage in further reactions. This study provides a spontaneous and tunable production of syngas in biogas digesters via a electrochemical strategy.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 33
·25436-25445
·
IF 2.779
Li Saisai,Li Xingjia,Zhang Xiuli,Lv Zhaoyue,Liang Zhu,Xu Haisheng
The multilayer electrocaloric ceramics (MLEC) are promising candidates for environmentally friendly refrigeration, since it possesses large electrocaloric effect (ECE) at a relatively low applied voltage. In this work, factors that may influence the ECE of MLEC are investigated. Experimental results demonstrate that the ECE of MLEC is strongly related to its effective volume fraction, and the effective volume fraction of the MLEC can be tailored by changing the thickness of the MLEC protective layer. Measurements show up to a 33.3% improvement of adiabatic temperature change when the thickness of MLEC protective layers is decreased by 70.0%. Meanwhile, the relaxation and the temperature range of the MLEC is increased with the increase of frequency. The enhanced ECE response is obtained over a broad temperature range from 0 °C to 50 °C in MLEC. It is found that the ECE response of MLEC could be enhanced by thinning the protective layer, and this enhancement is induced by the increasing of the effective volume fraction which is caused by the protective layer thinning. As a result, this work provides an effective and feasible way to develop high-performance MLEC components.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 8
·1099-1110
·
IF 1.42
Yu Rui-lei,Zhang Li-sheng,Feng Yu-hong,Zhang Ruo-yu,Zhu Jin
Polylactide (PLA) was successfully toughened by blending with bio-based poly(ester)urethane (TPU) elastomers which contained bio-based polyester soft segments synthesized from biomass diols and diacids. The miscibility, mechanical properties, phase morphology and toughening mechanism of the blend were investigated. Both DSC and DMTA results manifested that the addition of TPU elastomer not only accelerated the crystallization rate, but also increased the final degree of crystallinity, which proved that TPU has limited miscibility with PLA and has functioned as a plasticizer. All the blend samples showed distinct phase separation phenomenon with sea-island structure under SEM observation and the rubber particle size in the PLA matrix increased with the increased contents of TPU. The mechanical property variation of PLA/TPU blends could be quantitatively explained by Wu’s model. With the variation of TPU, a brittle-ductile transition has been observed for the TPU/PLA blends. When these blends were under tensile stress conditions, the TPU particles could be debonded from the PLA matrix and the blends showed a high ability to induce large area plastic deformation before break, which was important for the dissipation of the breaking energy. Such mechanism was demonstrated by tensile tests and scanning electron microcopy (SEM) observations.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 3
·964-977
·
IF 3.5
Zhu Q.,Wei S.,Wang C.,Yang X. B.,Zhou B.,Xie Z. X.,Duan Z. Q.,Hu Y. M.
Unique wool-ball shaped nanocrystalline CoS was synthesized using solvothermal method in which dopamine (DA) was added as carbon source to combine with the CoS. The DA in situ polymerized and coated on the CoS particle surfaces during the solvothermal process. N, S co-doped carbon-encapsulated CoS(Co 9 S 8 ) were achieved after a post carbonization. In the composites, CoS(Co 9 S 8 ) nanocrystals and carbon are tightly bound and embedded into the amorphous carbon layer to form a spherical core–shell structure. Hybrid counter electrodes (CEs) fabricated with the product have good conductivity, dispersion and stability due to the synergetic effect between carbon and nanocrystalline CoS(Co 9 S 8 ). Charge transfer through the CE/electrolyte interfaces is improved by dopamine-carbon combination. In the optimal case, PCE of 8.82% of the dye-sensitized solar cells (DSSCs) with the hybrid CEs was achieved, which is close to that of the cell with Pt (8.86%) CE, and is a 41.12% increase compared with that of CoS CE cell with the structure of photoanode/N719/electrolyte (I − /I 3 − )/CE. Moreover, stability of the cells with the composite CEs was greatly improved. The results demonstrate that the as-prepared composites are promising alternatives to Pt-CEs for high-performance DSSCs. The reported preparation method will guide further developments in highly efficient carbon-based catalysts for electrochemistry and energy related applications.
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高影响因子
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