ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wei Huang,Wenjin Li,Min Gao,Xiaodan Wang,Jiantao Wang,Weidong Zhuang
Structural degradation and surface chemical instability are dominant issues of Ni-rich layered cathodes, which trigger capacity fading and safety concerns, hindering the extensive application of Ni-rich cathodes toward high-energy, long-life lithium-ion batteries. Here, by combining trace Ta doping and an ultrathin Zr–Y mixed oxide coating, an integrated modification strategy significantly improves the cycling and thermal stability of Ni-rich LiNi0.88Co0.10Al0.02O2 (NCA) cathodes. The integrated modified Ni-rich cathode provides an unprecedented comprehensive performance with a high discharge capacity of 212.2 mA h g–1 at 0.1 C, an 88.6% cycling retention after 500 cycles at 1 C, and a high exothermic peak temperature of 261 °C compared with the pristine NCA cathode (67.4% capacity retention for 500 cycles and 221 °C for the exothermic peak). Further mechanism studies illustrate that a dual-structural surface constructed of a rock salt surface induced by Ta doping and ultrathin Zr–Y mixed oxide coating jointly suppresses surface side reactions between cathodes and electrolytes. Moreover, trace Ta doping in the bulk stabilizes the bulk structure and prevents mechanical cracks. This study highlights the importance of comprehensive modification of the bulk and surface for improving the electrochemical performance and provides a potential optimizing strategy for the commercialization of high-capacity Ni-rich cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 9
·4325-4341
·
IF 3.5
P. J. Xia,X. Z. Zheng,L. Yue,Y. F. Lei,M. Xu,W. B. Dai
For further development of light sources, white light-emitting diodes (wLEDs) have attracted widespread attention as promising next-generation light sources fabricated via the combination of phosphors and LED chips. However, latent defects, such as chemical/thermal instability, low color rendering index (CRI) and high correlated color temperature (CCT), of current mainstream wLEDs seriously hinder their further large-scale implementation. Herein, in order to overcome these limitations, single-phase color-tunable gaudefroyite (Ca3Y(GaO)3(BO3)4 (CYGB)) tridoped with Bi3+/Tb3+/Eu3+ ions was synthesized for the first time and detailed characterisation was performed via high-temperature solid-state reaction and structural/spectral analyses, respectively. Radius difference percentage calculations and Rietveld refinements indicate that dopants occupy both Y3+ and Ca2+ sites but preferably the Y3+ site over the Ca2+ site due to the same valence state. Through subtly regulating the (co)doping contents and skillfully utilizing the energy transfer (ET) strategy from the allowed transition of blue light-emitting Bi to the forbidden transition of green/red light-emitting Tb/Eu, the color hue (including white light) of highly efficient PL can be easily tuned according to the need. Meanwhile, composition/content-optimized white light-emitting CYGB:2%Bi/10%Tb/12%Eu also shows splendid chemical/thermal stability. Finally, as a proof-of-concept experiment, the CYGB:2%Bi/10%Tb/12%Eu phosphor-converted wLED (pc-wLED) was fabricated and encapsulated via the up-to-date remote ‘capping’ method, which imparted attractive performances. Altogether, the stable CYGB:Bi/Tb/Eu phosphor is a promising candidate for application in lighting/display fields.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 19
·5650-5655
·
IF 4.553
Xingyun Li,Bin Han,Yaojie Xu,Xiao Liu,Chunhui Zhao,Jun Xu
As an advanced two-dimensional (2D) material with unique properties, black phosphorus (BP) has attracted great attention in a variety of fields. One of the main obstacles for the practical application of BP is the poor ambient stability of few-layer BP, especially under light irradiation. In this study, a light-absorbing conjugated polymer is functionalized on the surface of BP during the exfoliation process, yielding BP nanosheets with light-resistance. The obtained BP/polymer nanosheets demonstrate enhanced stability compared to pure BP under sunlight. Systematic characterization reveals that the crystal structure and electronic characteristics of BP are well retained after 30 days of sun exposure. This convenient and efficient conjugated polymer passivation provides a novel light-prohibited method to improve the stability of BP for future applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 10
·45940
·
IF 1.86
Mei Wang,Jianchun Jiang,Jianling Xia,Shouhai Li,Mei Li
Phosphate ester groups containing ricinoleic acid-based Ca/Zn (LPPRA-Ca and LPPRA-Zn) stabilizer was successfully synthesized from ricinoleic acid (RA) and used as thermal stabilizers for poly(vinyl chloride) (PVC). These thermal stabilizers were characterized by Fourier transform infrared spectrometry, 1 H nuclear magnetic resonance, and inductively-coupled plasma atomic emission spectroscopy. The effects of LPPRA-Ca/LPPRA-Zn, CaSt 2 /ZnSt 2 , and other stabilizers on the thermal stability of PVC were studied through Congo Red test, discoloration tests, thermogravimetric analysis (TGA), TGA–infrared, and TGA–mass spectrometry. The thermal stability tests show that LPPRA-Ca/LPPRA-Zn displays the best initial color stability and long-term thermal stability for PVC. The superior performance is attributed to the synergistic effect of LPPRA-Ca and LPPRA-Zn. Moreover, a lower Zinc content of LPPRA-Zn in PVC helps to decrease the “zipper dehydrochlorination” of the product, which contributes to a better initial thermal stability. Except for the better stabilization performance, LPPRA-Ca/LPPRA-Zn also displays better plasticization performance for PVC compared with other stabilizers. A possible stabilizing mechanism of PVC/LPPRA-Ca/LPPRA-Zn system was presented. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45940.
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
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
·
2022
·
IF 5.589
Min-Fei Sun,Youfu Xu,Jun-Jie Yuan,Wei-Jie Fang
Insulin treatment is currently considered to be the main strategy for controlling diabetes. Although the recombinant insulin formulation is relatively mature, we found that a batch of insulin formulation exhibited an unusual degradation rate in the stability experiment. The main purposes of this article are to identify the root cause for this phenomenon and characterize of chemical and physical degradation products. We compared the chemical and physical stability of two batches of insulin formulations prepared separately with simulated repeated use and freshly opened glycerol. The chemical stability of insulin was identified by liquid chromatography coupled with tandem mass spectrometry (LC- MS/MS). Micro-flow imaging (MFI), far-ultraviolet circular dichroism (Far-UV CD) and Thioflavin T (ThT) fluorescent assays were used to reveal protein aggregation and fibrosis . The chemical and physical stability of the insulin formulation with newly opened glycerol was much better than that with degraded glycerol, and both groups of formulations were extremely sensitive to light. The results indicated that the original batch insulin formulation with abnormal stability was indeed caused by the excipient glycerol after long-term storage and repeated usage. More attention should be paid to the quality changes of excipients during repeated usage and storage of excipients for the practical purpose. Moreover, we have discovered a novel degradation pathway for insulin and peptides in general. In addition, LC-MS/MS results suggested that the N-terminus of insulin B-chain was prone to chemical degradation which enlightens that it could be potentially modified to improve the stability of insulin formulations.
研究领域:
药学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ou Hai,Peng Li,Jian Li,Bin Qin,Tong Li,Zechuan Qi,Qiang Ren,Yuanting Wu
ABSTRACT A new type of lead-free perovskite Cs 3 Bi 2 Br 9 nanocrystal (NCs) was synthesized by thermal injection method at 190 °C, according to X-ray diffraction and theoretical analysis, the Cs 3 Bi 2 Br 9 NCs belongs to the monoclinic system C12/c1. We report for the first time that the luminescence intensity of broad-peak-emitting Cs 3 Bi 2 Br 9 is significantly improved by doping with K + , and the full-width at half maximum (FWHM) of sample Cs 3 Bi 2 Br 9 :0.2K + is 124 nm. Herein, the stability of Cs 3 Bi 2 Br 9 :xK was monitored and found to have excellent environmental stability, thermal stability, and photostability. In addition, Cs 3 Bi 2 Br 9 :0.2K was coated outside Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS) to form a core-shell structure composite material Cs 3 Bi 2 Br 9 :0.2K + /SMS@SiO 2 and achieved fine tuning of the afterglow color. This work increases the luminescence intensity of Cs 3 Bi 2 Br 9 by ion doping and exhibits excellent stability, in addition to the cladding of lead-free perovskites with long afterglow materials provides a new application strategy for lead-free perovskites.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 33
·23621-23628
·
IF 3.9
Yingfen Huang
Developing a slippery lubricant-infused porous surface (SLIPS) is an important strategy for fabricating dynamically omniphobic surfaces. In this study, biocompatible and non-toxic liquid silicone rubber, TiO2 nanoparticles, and dimethyl silicone oil were used to fabricate a SLIPS. Subsequently, systematic investigation was conducted to explore its associated properties and address existing challenges in this field. The chosen lubricant exhibited a strong chemical affinity towards the substrate, eliminating the need for any functionalization treatment prior to infusion. In addition, the fabricated SLIPS exhibited excellent dynamic omniphobicity as well as shear stability, thermal stability, chemical stability, and mechanical stability. Moreover, it demonstrated good self-cleaning performance for droplets, with varying surface energies, temperatures, and pH values, as well as for common dyes and contaminants. In addition, damage from external forces could self-repair on the SLIPS, which is beneficial for extending the service life and application range.
研究领域:
材料科学
·
表面工程
·
纳米技术
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2017
·
IF 3.386
Danfeng Zhang,Shen Yao,Shuai Li,Jun Wang,Youwei Yao
A new thermal stabilizer , La-Gly (Gly = n -[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]-glycin), was synthesized. Through discoloration and dehydrochlorination tests at 180 °C, La-Gly is found to possess high stabilizing efficiency for poly(vinyl chloride) (PVC): as the mass ratio of La-Gly to PVC resin is increased from 0.3/50.0 to 2.0/50.0, the time to degradation of PVC samples increases from 90 min to 190 min. Studies on combinations of La-Gly and ZnSt 2 , and of La-Gly and dibenzoyl methane (DBM) show that the initial color of PVC is improved, as the ratio of ZnSt 2 to La-Gly or DBM to La-Gly is increased from 0.3/1.2 to 1.2/0.3. One sample (50.0 g PVC, 0.6 g ZnSt 2 , 0.9 g La-Gly, 3.4 g tributyl citrate) shows the best balance between initial color and long-term thermal stability (140 min). Studies on dynamic thermal stability of the samples (50.0 g PVC, x g La-Gly, 3.4 g tributyl citrate, x = 0.3, 0.6, 0.9, 1.2, 1.5, 2.0) show that when x equals 1.2, the thermal dynamic stability time is 24.5 min, much longer than 6.4 min and 4.8 min, respectively, for two controls (50.0 g PVC, 1.5 g LaSt 3 , 3.4 g tributyl citrate; 50.0 g PVC, 0.6 g CaSt 2 , 0.9 g ZnSt 2 , 3.4 g tributyl citrate).
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 47
·12422-12429
·
IF 5.256
T. T. Deng,E. H. Song,Y. Y. Zhou,L. Y. Wang,Q. Y. Zhang
Three isotypic double perovskites A2BAlF6:Mn4+ (A = Rb, Cs; B = K, Rb) were synthesized via a facile co-precipitation method at room temperature. XRD Rietveld refinements and Raman spectra indicate that the neighboring smaller A-site or larger B-site cation in A2BAlF6:Mn4+ lowers structural stability, but suppresses the [AlF6] octahedron to increase the crystal field strength and bond strength of the Al–F bond. Cs2KAlF6:Mn4+ presents a sharp line red light and excellent moisture resistance, but experiences severe thermal quenching. In comparison, altering the A- or B-site cation to Rb, Rb2KAlF6:Mn4+ and Cs2RbAlF6:Mn4+ shows blue shifts in emission and declining water resistance, but enhancements in thermal stability. A combination of static and dynamic emission degradations demonstrates that the water resistance of Mn4+ emission mainly relies on the structural stability of the host matrix; meanwhile, the thermal stability highly depends on the rigidity of its local accommodation. The variations of the temperature-dependent white light-emitting diode (WLED) performances further evidence their sufficient thermal stability for LED applications. These findings suggest that neighboring-cation modulation might be a feasible guideline for exploiting stable Mn4+-activated fluoride red phosphors in warm WLED applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Yaxin Xu,Xingchen Chai,Wantian Yang,Jiarui Hu,Junnian Chen,Yunbin He
Lead-free zero-dimensional (0D) hybrid bismuth halide perovskites have aroused great interest due to their promising emission properties and good chemical stability. Herein, we report the design and synthesis of mixed-cation-phase 0D guanidinium–formamidinium bismuth chloride, [C(NH2)3]2[CH(NH2)2]3Bi2Cl11 (denoted as Gua2FA3Bi2Cl11), where an individual corner-sharing [Bi2Cl11]5– dimer is completely isolated and surrounded by the mixed Gua+ and FA+ organic cations. The corner-sharing connectivity mode in Gua2FA3Bi2Cl11 differs from that in pristine Gua3BiCl6, featuring an isolated [BiCl6]3– unit. Importantly, Gua2FA3Bi2Cl11 yields remarkable broadband emission spanning from 350 to 750 nm, different from the pristine Gua3BiCl6, showing distinct narrowband emission. Further investigation of photophysical properties reveals that the broadband emission has contributions from both free excitons and self-trapped excitons. Moreover, Gua2FA3Bi2Cl11 not only exhibits excellent photostability under continuous high-power UV lamp irradiation during 70 min but also is humidity stable for over 6 months under ambient conditions. This finding presents a novel molecular engineering strategy for the development of eco-friendly and stable 0D perovskite broadband emitters.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2020
·Vol. 146
·期 4
·1657-1665
·
IF 2.731
Xia Huimin,Gao Hui,Zhang Yuxi,Wang Zhongwei,Song Liang,Liu Lei,Tian Xiujuan,Huang Xiaowen,Yu Qing
The antioxidant of bamboo leaves (AOB) was used firstly to stabilize polypropylene (PP). Thermogravimetric analysis, oxidation onset temperature and oxidation induction time tests were carried out to test the thermal and thermo-oxidative stability of samples. The melt flow rate and yellowness index were used to characterize the processing stability and color of samples. Field emission scanning electron microscopy was used to determine the distribution of additives. Results showed that AOB improved the thermo-oxidative stability and processing stability of PP. The efficacy of AOB was comparable with that of Irganox 1010 in protecting PP. However, due to the dark yellow color of AOB, the problem of the discoloration of the polymer matrix was not solved.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuchen Xing,Xiuli Shen,Qijian Niu,Hongwei Duan,Chengshun Tang,Bo Tao,Siyu Chen,Qianyi Shangguan,Bo Feng,Haizhang Yu,Zhong Tang,Guanya Ji
Nanoplastics, characterized by their small size, high diffusion, and stability, have emerged as the new class of pollutants posing a global threat. For achieving both chemical and thermal stability of adsorbents, this study synthesized FeMg-LDO@BC, a novel adsorbent prepared through the in-situ growth and calcination of FeMg-layered double hydroxide (FeMg-LDH) on pre-treated biochar. FeMg-LDO@BC demonstrated an excellent adsorption rates and removal efficiencies for polystyrene nanoplastics (PSNPs) as determined by pseudo-first-order kinetic model and Sips isotherm model, reaching a 99.8 % adsorption efficiency and the maximum capacity of 97.93 mg/g. The removal mechanism was primarily attributed to π-π EDA interactions, surface complexation, and hydrogen bonding. Furthermore, the composite exhibited excellent chemical and thermal stability, demonstrating robust environmental adaptability and regenerative performance. After five cycles of adsorption-thermal degradation, FeMg-LDO@BC maintained 80 % of its initial adsorption capacity. The thermal regeneration products were primarily composed of styrene, with the presence of alkenes and aromatic hydrocarbons, confirming the simultaneously degradation of nanoplastics and the regeneration of the biochar adsorbent.
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
危险品化学品经营许可证（带存储）