CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Pengju Xia,Wanyuan Li,Kaiting Wu,Yifeng Lei,Wubin Dai
In the process of studying newfangled phosphor-converted white-light-emitting diodes (pc-wLEDs), some basic and important objectives of phosphor, i.e., high chemical/thermal stability, color rendering index (CRI), and low correlated color temperature (CCT), should pass muster simultaneously. Herein, for the first time, a series of photoluminescence (PL) color-tunable single-phase Ca3Y(GaO)3(BO3)4: Dy3+/Sm3+/La3+ (CYGB: Dy/Sm/La) phosphors with good dispersivity, crystallinity, and size uniformity have been designed and synthesized via a facile solid-state reaction method. Structurally, based on XRD and Rietveld refinements, the tendentious occupations of Dy/Sm/La on the Y3+ site with a 9-coordinated number (CN) over other cationic sites are in line with the facts that the ionic radius and charge difference of Dy/Sm/La are much closer to Y3+ in 9-CN than Y3+ in 7-CN and Ca2+ in both 9- and 7-CN. Spectrally, thanks to the “cool” white PL from 4f–4f transitions of Dy and red-emitting from Sm, polychromatic PL including “warm” white light with high efficiency could be realized in CYGB: Dy/Sm via the regulation of doping content and energy transfer (ET). Intriguingly, the “abnormal” phenomena of zero-thermal-quenching in the range from room temperature (RT) to 573 K were observed, probably owing to the synergistic effects of electron–phonon coupling, ET, and structural defects. Moreover, by tridoping La3+ to legitimately adjust the site environments, the PL of both Dy/Sm could be further tuned because they all include hypersensitive transitions that are closely related to the crystal field environment. Finally, as a proof-of-concept fabrication, the pc-wLED assembled by a combination of the composition-optimized CYGB: Dy/Sm/La and an n-UV LED chip via remote “capping” packaging shows attractive performances, indicating its potential as an efficient phosphor for n-UV wLEDs.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-14
·
IF 2.8
Zhang Yajuan,Lu Yang,Shan Yiting,Wang Jie,Feng Jingmin,Zhou Hongqing
Herein, (1 − x )CaO–Al 2 O 3 –B 2 O 3 –SiO 2 (CABS)/ x Ba(Mg 1/3 Nb 2/3 )O 3 (BMN; x = 0.4, 0.45, 0.5, 0.55, and 0.6) composites were prepared, and the impact of the BMN and low-softening-point glass content in CABS/BMN composites on the sintering, dielectric, thermal, and mechanical properties of the prepared composites was investigated. The main crystal phases of the CABS/BMN composites are BMN and Ba 2 NaNb 5 O 15 (BNN). The crystallization temperature of the composite was reduced by an appropriate amount of BMN. BMN ceramics (40–60 wt%) was added to the CABS glass, and the composites were sintered at 800 °C, 825 °C, 850 °C, 875 °C, and 900 °C. To elucidate the influence mechanism of different glass contents and sintering temperatures on the properties of the composites, different qualitative and quantitative instruments were used to study the composite properties. The CABS/BMN composite containing 50 wt% CABS glass sintered at 875 °C exhibits the following ideal properties: volumetric density of 3.57 g/cm 3 , dielectric constant of 17.97, dielectric loss of 6 × 10 −4 , \(Q \times f\) value of 10,947 at 9.5 GHz, bending strength of 157.7 MPa, and coefficient of thermal expansion of 5.9 ppm/K. Microstructure analysis reveals that the microstructure of the composite is dense, the pores are few, the surface morphology is uniform and flat, and the composite does not react with silver electrodes, making it suitable for applications utilizing medium dielectric constant low-temperature co-fired ceramic materials at low sintering temperatures.
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 7
·1-9
·
IF 2.019
Xu Jingmei,Ren Chunli,Cheng Hailong,Ma Li,Wang Zhe
Double fluoride 2,5-bis(4-fluorophenyl)-1,3,4-oxadiazole (BFO) monomer was synthesized. Copolymerization of BFO, 2,2-bis(4-hydroxypheny)propane (bisphenol A) and 3′3-disulfonate-4′4-dichloro dipheny sulfone (SDCDPS) at different molar ratio resulted in a new poly (aryl ether sulfone) containing 1, 3, 4-oxadiazole polymers (SPAESO). The structures of monomer BFO and copolymer were confirmed by FT-IR and 1 H NMR. The TEM pictures showed that the ion clusters were formed and distributed evenly in SPAESO copolymer matrix. The sulfonated polyoxadiazole membranes exhibited excellent thermal, dimensional and oxidative stability and lower methanol diffusion coefficient. The proton conductivity of SPAESO-3 was 7.5 × 10 −2 Scm −1 at 120 °C while the methanol permeability coefficient of SPAESO-3 was only 2.23 × 10 −7 cm 2 S −1 at 25 °C. According to the comprehensive performance, the sulfonated polyoxadiazole membranes may be the alternative materials as proton exchange membrane for PEMFC at medium-high temperature operation.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuxiang Chen,Xiangyue Liao,Peng Wang,Ji Chen,Xiaoqin Zhang,Xingqiao Wu,Sean C. Smith,Dunmin Lin,Xin Tan,Qiaoji Zheng
The stable three-dimensional framework and high operating voltage of sodium superionic conductor (NASICON)-type Na 3 V 2 (PO 4 ) 3 has the potential to work with long cycle life and high-rate performance; however, it suffers from the poor intrinsic electronic conductivity and low energy density . Herein, Ga 3+ is introduced into Na 3 V 2 (PO 4 ) 3 to activate the V 4+ /V 5+ redox couple at a high potential of 4.0 V for enhancing energy density of the materials (Na 3 V 2-x Ga x (PO 4 ) 3 ). After the partial substitution of Ga 3+ for V 3+ , three redox couples (V 2+ /V 3+ , V 3+ /V 4+ and V 4+ /V 5+ ) of V are reversibly converted in the voltage range of 1.4–4.2 V, suggesting multi-electrons (>2e − ) involved in the reversible reaction, and simultaneously the electronic conductivity of the materials is effectively enhanced. As a result, the cathode with x = 0.75 exhibits excellent electrochemical properties: in the voltage range of 2.2–4.2 V, delivering an initial capacity of 105 mAh/g at 1C with a capacity retention rate of 92.3% after 400 cycles, and providing a stable reversible capacity of 88.3 mAh/g at 40C; and in the voltage range of 1.4–4.2 V, presenting the reversible capacity 152.3 mAh/g at 1C (497.6 Wh kg −1 ), and cycling stably for 1000 cycles at 20C with a capacity decay of 0.02375% per cycle. It is found that the Na 3 V 2-x Ga x (PO 4 ) 3 cathodes possess the sodium storage mechanism of single-phase and bi-phase reactions. This investigation presents a useful strategy to enhance the energy density and cycling life of NASICON-structured polyanionic phosphates by activating high-potential V 4+ /V 5+ redox couple.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Hai Wu,Youjin Zhang,Maozhong Zhou,Chengpeng Yao,Xianjin Ge
Large single crystals of gadolinium hydroxide [Gd(OH) 3 ] in the length of several millimeters were successfully prepared by using solid KOH assisted hydrothermal method. Gd(OH) 3 samples were characterized by X-ray diffraction (XRD), 4-circle single-crystal diffraction, Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). FESEM image shows hexagonal prism morphology for the Gd(OH) 3 large crystals. The possible growth mechanism of Gd(OH) 3 large single crystals was proposed. The photoluminescence and magnetic properties of Gd(OH) 3 species were investigated.
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DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2018
·
IF 1.703
Zi-Mei Ding,Wen-Li Cao,Xiao-Jing Hang,Xiao Ma,Hui Zheng,Kang-Zhen Xu,Jie Huang
The green nitrogen-rich coordination compound Cd(SCZ)2(AFT)2 (1) (AFT =4-amino-3-(5-tetrazolate)-furazan and SCZ = semicarbazide) was first synthesized and characterized by EA and Fourier Transform Infrared (FT-IR). The single crystal was cultivated and determined with X-ray diffraction. It revealed that 1 crystallizes in the monoclinic space group P21/c. A Cd2+ ion is coordinated by four N atoms and two O atoms to form a distorted octahedral structure. Among them, two nitrogen atoms are from the two AFT ions and the other four atoms are from two SCZ molecules. The thermal decomposition behavior of 1 was studied with DSC and TG-DTG methods. The apparent activation energy (E), thermal stability, and safety parameters (T
SADT, T
TIT, and T
b) were calculated for 1. Moreover, entropy of activation (ΔS
≠), enthalpy of activation (ΔH
≠), free energy of activation (ΔG
≠), specific heat capacity (C
p), and impact sensitivity were also discussed in detail.
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DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 19
·4093-4100
·
IF 4.154
Qing Wang,Yang Lu,Jun Jin,Chunhua Chen,Zhaoyin Wen
Graphical Closed borders : A Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) ceramic is adopted to block the migration of polysulfides in Li−S batteries, with solvent-in-salt wetting the electrode/ceramic interfaces. Owing to suppressed dissolution of polysulfides in SIS, the semi-solid-state Li−S batteries show superior capacity retention and long cycling life. Aimed at tackling the shuttle effect in lithium-sulfur (Li−S) batteries, a Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) ceramic is adopted to block the migration of polysulfides. However, the LAGP-based Li−S battery with liquid electrolyte wetting the interfaces still suffers from rapid capacity decay, as polysulfides tend to dissolve into liquid electrolyte and get firmly adsorbed by LAGP. In this work, a dual confinement effect for polysulfides is put forward, enabled by the LAGP ceramic and solvent-in-salt (SIS), wherein the SIS can greatly suppress the dissolution of polysulfides. Owing to the synergistic effect of SIS and LAGP, the semi-solid-state Li−S batteries show superior capacity retention and long cycling life. In particular, at a current density of 0.2 C, the Li−S battery with SIS-modified LAGP ceramic electrolyte delivers a high initial reversible capacity of 1251.7 mAh g −1 and long cycle life of over 250 cycles with a decay rate of only 0.07 % per cycle.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xin Liu,Qi Fu,Peng Xu,Pengfei Zhu,Zhuoyu Yang,John C. Crittenden
A sensitive spectrophotometric method (the Br − -ABTS method) for measuring monopersulfate (PMS) of 0–20 μM in water was established. The Br − -ABTS method was based on the oxidation coloration reaction where Br − as catalyst promoted PMS for oxidation of ABTS forming the green-colored ABTS radical (ABTS • + ) under pH 3.0 (50 mM phosphate buffer). ABTS • + could be quantitatively measured at 415 nm, 650 nm, 732 nm and 820 nm using UV–vis spectrophotometer. There was a well linear relationship between the absorbance of ABTS • + and PMS concentration with the value of R 2 being 0.999. The proposed Br − -ABTS method was highly sensitive, and the absorbance generated by Br − -ABTS at 415 nm was 6.59 × 10 4 cm −1 per M (mol L –1 ) of PMS. The changes of pH from 3.0 to 9.0 had an insignificant effect on the calibration curve of Br − -ABTS method. The reaction of PMS with ABTS had a stoichiometric coefficient of 1:1.96 at the pH 3.0. The residual absorbance of ABTS •+ in ultrapure water, Xiangjiang water and Hou-lake water was stable within 30 min. Moreover, the trace PMS concentration of 0.03–20 μM in ultrapure water, 0.05–20 μM in natural water (e. g. Xiangjiang water and Hou-lake water) and 1–20 μM in wastewater was accurately measured with the proposed Br − -ABTS method. Additionally, the interference of natural water matrix (e. g. humic acid), metal ions (e. g. Co(II), Fe(III) and Cu(II)) and hydroxylamine had barely interference for the proposed Br − -ABTS method. Furthermore, the Br − -ABTS method was more accurate and flexible to determine PMS concentration than DPD method during the decolorization of rhodamine B in the Co(II)/PMS system, Cu(II)/PMS system and hydroxylamine/Fe(III)/PMS process.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Xinzhi Ma,Jing Wen,Shen Zhang,Haoran Yuan,Kaiyue Li,Feng Yan,Xitian Zhang,Yujin Chen
Development of noble-metal-free and active electrocatalysts is crucial for the oxygen evolution reaction (OER) in the water-splitting process. Herein, crystal CoxB catalysts (x = 1–3) of the OER are fabricated by a ball-milling method. Among these CoxB catalysts, Co2B exhibits the best OER activity, with a current density of 10 mA cm–2 at an overpotential of 287 mV in 1 M KOH solution. Such OER activity of Co2B is favorably comparable to that of the commercial IrO2 and most recently reported OER catalysts. Furthermore, the Co2B catalyst exhibits excellent stability with a stable current density of 50 mA cm–2 over 12 h of continuous electrolysis operation. X-ray photoelectron spectroscopy and cyclic voltammetry demonstrate that the B in CoxB makes oxidation easier, leading to their enhanced OER activities in comparison to metal Co. In addition, the Co2B electrocatalyst also exhibits high activity in the hydrogen evolution reaction; thus, the catalyst can be used as a bifunctional catalyst for full water splitting.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·10828-10833
·
IF 6.4
Dandan Wang,Xinyuan Zhang,Pifu Gong,Zheshuai Lin,Zhanggui Hu,Yicheng Wu
The balance between band gap and second harmonic generation (SHG) response, which are usually inversely related, is the key factor for achieving good performance in a mid-infrared (mid-IR) nonlinear optical (NLO) crystal. Still it remains a challenge to achieve this balance, which strongly hinders the development of mid-IR solid-state lasers. In this work, utilizing an aliovalent substitution strategy of functional units, we successfully realize mid-IR NLO balanced performance in a chiral iodate, Ga(IO3)3, which simultaneously exhibits a strong SHG response (13 × KDP) and a wide optical band gap (3.94 eV). The first-principles calculation is also performed to elucidate its NLO origin. Combining the experimental measurements and theoretical calculations, it is clear that Ga(IO3)3 possesses excellent comprehensive NLO performance including a strong SHG effect, a wide band gap, good thermal stability (450 °C), and a large birefringence, indicating its potential applications as a mid-IR NLO crystal.
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高影响因子
ANALYTICAL LETTERS
·
2024
·
IF 1.6
Yan Chen,Yiwei Sun,Shuyan Qi,Li Zhang,Ming Yin,Xiuxia Wei,Yuting Luo,Dongpo Xu
Yolk-shell SnO2 mesoporous double-layer nanotubes were synthesized in one-step by single nozzle electrospinning. Compared with the traditional electrospinning using polyvinylpyrrolidone (PVP) as the precursor polymer to obtain the single nanotube material, two PVPs (PVPK88-96 and PVPK23-27) with different molecular weights in solution coupled with Sn2+ easily form the core-shell structure nanofiber through phase separation. The yolk-shell double-layer SnO2 nanotubes were obtained after calcination at 600 °C for 2 h. The yolk-shell SnO2 mesoporous double-layer nanotube is a promising sensing material toward 3-hydroxy-2-butanone as it shows high sensitivity, cycling stability, and selectivity. Moreover, the response and recovery times of the yolk-shell SnO2 mesoporous double-layer nanotubes toward 1 ppm 3-hydroxy-2-butanone were 122 s and 117 s.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Suyu Kong,Meili Ding,Mengjiao Yu,Wei Rong,Yang Wang,Jianfeng Yao
Developing high-efficiency adsorbents with sufficient active species to remove phosphate from wastewater is still a significant and formidable challenge. Herein, a metal-ion modification strategy was developed to construct a series of lanthanum (La 3 + )-functionalized zirconium-based metal-organic frameworks containing different functional groups through a one-step solvothermal process. The investigations for the influence of functional groups of ligands on the resulting La species and the role of La(OH) 3 in the phosphate removal are the primary focuses of this research. Unlike the simple La doping in UiO-66, UiO-66-NH 2 and many previously reported MOF systems, La(OH) 3 was in situ formed during the preparation of La-functionalized UiO-66-OH, which was confirmed by powder X-ray diffraction. At room temperature, the optimized 0.5La-UiO-66-OH, with a molar ratio of La 3+ versus the total metal precursor of 0.5, exhibits a desirable adsorption capacity of 219.6 mg g −1 , exceeding those of UiO-66 (146.8 mg g −1 ), UiO-66-OH (158.9 mg g −1 ), and many reported adsorbents. Besides, reusability tests demonstrate that 0.5La-UiO-66-OH can maintain high adsorption performance (96 %) after five cycles and the practical usability of by 0.5La-UiO-66-OH is confirmed using real lake water. In-depth investigations (X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy) on mechanism unveiled that the adsorption of phosphate by 0.5La-UiO-66-OH involved a combined process of electrostatic attraction and ligand exchange. This research presents the first regulation of generating active La species within MOFs through subtle modification and provides valuable insights for wastewater treatment.
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