Science China-Materials
·
2020
·Vol. 64
·期 1
·158-168
·
IF 6.098
Fang Cong,Li Ye,Cai Yuting,Zhou Tian-Liang,Tang Xueyuan,Xie Rong-Jun
Cesium lead halide perovskite nanocrystals (NCs) have attracted unprecedented attention owing to their compelling properties for optoelectronic applications. Compared with the classical hot-injection method, the room-temperature (RT) synthetic strategy is more facile and tender, but it is hard to obtain stable CsPbI 3 NCs and it usually uses polar solvents that sometimes reduce the stability and properties of NCs. Here, we reported a simple approach to synthesize highly efficient and stable CsPbI 3 as well as other color-tunable CsPbX 3 NCs with high quantum efficiency at room temperature via an anion exchange at the water-oil interface, in which the as-synthesized pristine CsPbBr 3 NCs in toluene were treated in aqueous solutions of HX (X=Cl, Br, and I) and protonated oleylamine (OAm) acted as a carrier. The synthesized CsPbI 3 NCs had an emission at 680 nm and even showed excellent colloidal stability after being stored for 32 d. The high efficiency and stability of the obtained CsPbX 3 NCs were ascribed to the facts that: (i) the polar reagents were almost removed from the surface of NCs; (ii) the defect-related nonradiative recombination was suppressed efficiently by surface passivation.
研究领域:
纳米材料
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光电子学
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钙钛矿化学
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胶体合成
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 23
·7893-7905
·
IF 4
Lingjun Shu,Jingxuan Yin,Zhemin Gon,Chengwei Gao,Yongxing Liu,Xiaolong Zhou,Hongli Ma,Xianghua Zhang,Xiang Shen,Shixun Dai,Changgui Lin,Qing Jiao
The fabrication of all electrolytes from noncombustible ceramic materials offers a superior option for providing safer and higher-capacity batteries to fulfill future energy needs. To achieve a competitive performance with combustible liquid electrolytes used in commercial Li-ion batteries, the creation of ceramic material compositions with a high electrical conductivity is necessary. Here, we report that co-doping with W and halogens results in a superconductivity of 13.78 mS cm−1 in a cubic-phase Na3SbS4 glass ceramic electrolyte. After undergoing high-temperature heat treatments, the W ions in the electrolyte can facilitate the replacement of S atoms with halogens, introducing many Na vacancies. The samples also had a high degree of cycling stability. An excellent glass ceramic electrolyte for Na ion batteries will be constructed for Na3SbW0.25Cl0.25S4.
研究领域:
材料科学
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电化学
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固态离子学
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能源存储
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无机非金属材料
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电池技术
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hao Xiong,Hanyou Zhang,Baisheng Sa,Ping Li,Lingyan Lin,Aijun Yang,Jiansheng Li,Jinquan Hong,Linqin Jiang,Yu Qiu
All-inorganic halide perovskite nanocrystals (PNCs) have attracted extensive attention due to their potential for the next-generation displays. The ammonium and halide composition affect strongly the photoelectrical properties and the long-term stability of PNCs. In this work, we present a novel class of mixed all-inorganic (Cs,NH 4 )Pb(Br,X) 3 (X = Cl, Br, I) NCs prepared via cation/anion co-exchange reaction between CsPbBr 3 NCs and the mechanochemically reacted NH 4 Pb n X 2n+1 (X = Cl, Br, I, n = 1 or 2) powders. The cubic morphologies of (Cs,NH 4 )Pb(Br,X) 3 NCs with different halogen element combinations were successfully obtained. In the meanwhile, the extended emission ranges from deep-blue (453 nm) to warm-yellow (564 nm). Higher PLQY and higher stability against ambient air and UV light were achieved simultaneously by controlling the ion co-exchanging process. The photoluminescence quantum yield (PLQY) of (Cs,NH 4 )Pb(Br,X) 3 (X = Cl, Br, I) NCs were also significantly enhanced compared with that of pure CsPbBr 3 after ions exchanging (>85% versus 58%). In addition, the stability of (Cs,NH 4 )Pb(Br,X) 3 (X = Cl, Br, I) NC thin films under the UV-irradiation and in the ambient atmosphere were also dramatically improved. The cation/anion co-exchanging synthetic strategy developed in our research provides a new pathway to modulate and realize mixed-ion PNCs with high optoelectronic performance.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Kewei Ma,Yuhang Sheng,Guizhen Wang,Xiaowei Zhang,Yunsong Di,Cihui Liu,Liyan Yu,Lifeng Dong,Zhixing Gan
Mn 2+ doping has been developed to modulate the photoluminescence (PL) of CsPbCl 3 perovskite quantum dots (PQDs). However, the doped Mn 2+ may be expelled from the PQDs host with the long-term storing, resulting in inferior stability. Herein, CsPbCl 3 PQDs doped with different concentrations of Mn 2+ (Mn:CsPbCl 3 ) are prepared by a hot injection method. Our photostability tests reveal that when the doping concentration is <25%, or 40%–50%, the Mn 2+ doped PQDs are intrinsically stable. Anion exchange reactions are conducted between the stable CsPb 0.796 Mn 0.204 Cl 3 and CsPbBr 3 PQDs. Fluorescence color gamut of the resulting Mn:CsPb(Cl/Br) 3 PQDs almost covers the entire visible spectrum except for the deep red color. Benefiting from the intrinsic stability and wide color gamut, multicolor solid-state luminescence are acquired by incorporating the Mn:CsPb(Cl/Br) 3 PQDs in polymethyl methacrylate (PMMA) matrices, which are used as color converters for constructing light-emitting diodes (LEDs) with different colors.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuran Li,Zhicheng Xu,Jian Wang,Bin Wang,Tingyu Zhu
Activated carbon exhibits a high adsorption capacity for chlorinated volatile organic compounds (Cl-VOCs), while the desorption of Cl-VOCs is not desirable in the thermal regeneration progress of activated carbon. Chlorobenzene was selected as the model substance to explore whether Cl-VOCs can be oxidized as expected in the regeneration atmosphere of O 2 -free at the temperature range of 150–450 °C. The modification of activated carbon by Cu or Fe has been shown to considerably improve the decomposition activities. According to the breakthrough curves and detection results from XPS and in situ DRIFTS, the decomposition mechanism of C 6 H 5 Cl on Cu and Fe active sites is illustrated. The adsorbed C 6 H 5 Cl is firstly dechlorinated to form C 6 H 6 and *Cl, and then it was found there are two pathways for the C 6 H 6 oxidation. C 6 H 6 is indirectly oxidized to form C 6 H 5 OH and benzoquinone species, or directly ring-opened to generate ethylene and 1,3-butadiene, and further oxidized to produce CO 2 , CO and H 2 O. The C 6 H 6 oxidation is determined by the decomposition of acetate on Cu/AC, but the decomposition of benzoquinone and maleate on Fe/AC. The Fe 3 O 4 and Fe 2 O 3 active sites have a higher dechlorination activity but accelerate the deposition of FeCl 2 , FeCl 3 and organic Cl-containing components. The CuO active center has a higher oxidation performance with a higher CO 2 selectivity. About 83.0–83.5% of adsorbed chlorobenzene has been oxidized, and the main Cl-containing product is HCl accounting for approximately 77.8–81.0%, a small amount of Cl forms polychlorinated organic compounds or metal chlorides occupying 2.0–5.7%. As the regeneration temperature decreases, the total amount of Cl-containing species is reduced due the lower oxidation and dechlorination activity of catalysts. The decomposition products of Cl-VOCs in the thermal regeneration process of activated carbon were clarified and quantified, which provides a theoretical basis to control Cl-VOCs in regeneration gas.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yaqi Ding,Neng Gao,Yongping Wu,Yongmei Xuan,Guangming Chen
Calcium chloride (CaCl2) aqueous solution as a liquid desiccant has the disadvantage of low vapor pressure and easy crystallization. Ionic liquids (ILs) such as [Emim]Cl, [Emim]Ac, and [Emim]Br have been verified to have a good ability to reduce the vapor pressure. In this paper, the vapor pressures of four kinds of CaCl2 + ILs + H2O were measured, which were CaCl2 + [Emim]Br + H2O (mass ratio CaCl2/[Emim]Br = 2:1) at temperatures of between 311.10 and 394.45 K, CaCl2 + [Emim]Cl + H2O (mass ratio CaCl2/[Emim]Cl = 2:1) at temperatures of between 306.58 and 393.89 K, CaCl2 + [Emim]Ac + H2O (mass ratio CaCl2/[Emim]Ac = 2:1) at temperatures of between 304.93 and 382.71 K, and CaCl2 + [Emim]NO3 + H2O (mass ratio CaCl2/[Emim]NO3 = 2:1) at temperatures of between 312.46 and 391.80 K, with the mass fraction of solute ranging from 0.2 to 0.5. The Antonie-type equation was used to fit the measured results. The average absolute relative deviation (AARD %) values of the measured vapor pressures and calculated vapor pressures were 0.52, 0.40, 0.33, and 0.27%, which showed good consistency and accuracy. Comparing the vapor pressures of the different solutions at the same concentration, the following order of the four anions with the ability to reduce the vapor pressure of CaCl2 + H2O can be drawn at a mass fraction of 0.4: Br– > Cl– > NO3– > Ac–.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-9
·
IF 5.833
Jia Jing,Lu Wenjing,Cui Sai,Dong Chuan,Shuang Shaomin
N, Cl-doped carbon dots (N, Cl-CDs) were prepared by hydrothermal method from rhodamine B (RhB) and ethylenediamine (EDA). The resulting N, Cl-CDs exhibited fascinating solvent dependence and strict excitation independence. As the polarity of the solvent increased (from tetrahydrofuran (THF) to water), the emission spectrum of N, Cl-CDs was redshifted and the fluorescence efficiency decreased, which were attributed to hydrogen bond-induced aggregation. Taking advantage of these attributes, the N, Cl-CDs were used as suitable probes for fluorescence and colorimetric dual-mode detection of water in THF. The linear relationship was 0.5–100% water with the detection limit down to 0.093%. Moreover, the sensing platform was converted into a paper-based sensor for handy, real-time, and visible humidity sensing. N, Cl-CDs/PVA films were fabricated and realized continuously tunable solid-state fluorescence, further expanding their practical application. Graphical abstract
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PubMed
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901082
·
IF 7.125
Daqin Chen,Su Zhou,Feifan Tian,Haitao Ke,Naizhong Jiang,Shujin Wang,Yongzhao Peng,Yue Liu
Recently, Mn 2+ -doped CsPb(Cl/Br) 3 perovskite nanocrystals (NCs), showing the advantages of dual-color emissions via exciton-to-dopant energy transfer and reduced usage of toxic Pb 2+ heavy metal ions by nontoxic Mn 2+ substitution, are widely explored. However, photoluminescence quantum yields (PLQYs) for Mn 2+ -doped CsPb(Cl/Br) 3 NCs still need to be further improved. Here, a halogen-hot-injection strategy is developed to prepare Mn:CsPb(Cl 0.6 Br 0.4 ) 3 NCs with the maximal PLQY of 65%. With this method, intense blue narrowband emission from excitonic recombination and orange broadband emission from Mn 2+ 4 T 1 → 6 A 1 transition can be simultaneously achieved. The competitive luminescence between perovskite NCs and Mn 2+ dopants is systematically investigated by controlling the injected halogen types and ratios. As a proof-of-concept experiment, the present Mn 2+ -doped CsPb(Cl/Br) 3 perovskite NCs with highly efficient dual-color emissions are demonstrated to be applicable as color converter in UV-excitable solid-state lighting.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Zhongshu Li,Yuli Xue,Xiaoling Tan,Wenqing Li,Shaonan Xu,Ziyan Wang,Jian Wang,Lina Li,Shiding Miao
It is of great importance to separate potassium salts from carbonate-based lakes, especially the low-[K+] but high-[Na+] brine which has been discovered around the world. Here the phase diagram of the quaternary system Na+, K+//Cl–, CO32––H2O was experimentally studied at 298.15 K via the method of isothermal evaporation, and the results corrected the previous diagram reported by Blasdale (J. Am. Chem. Soc.1923, 45, 2935–2946). The type of salts appeared and their solubility during the evaporation, and the density vs composition diagram and the pH values were plotted based on the experimental data. It was found that there were six invariant points, seven univariant curves, and five crystallization fields in the equilibrium phase diagram. To extract single-salt of potassium, certain areas in the Na+, K+//Cl–, CO32––H2O diagram were chosen to be acidified by the compressed CO2, and potassium in the form of KHCO3 was precipitated from the mother solution. The compressed CO2 was able to avoid formation of NaKCO3·6H2O during evaporation of the original system Na+, K+//Cl–, CO32––H2O. Based on experiment data, the region area for potassium salt extraction was determined, and this area was suitable for extracting K+ salts from brines with a [Na+/K+] ratio even lower than 0.44. This strategy opened a new way to recovery of potassium with a maximum yield of 59.88% from the carbonate-chloride-based brine.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·172
·
IF 4.034
Xinyue Lao,Xiyu Li,Hans Ågren,Guanying Chen
Although all-inorganic CsPbX3(X = Cl, Br, I) perovskite quantum dots (PQDs) have evoked exciting new opportunities for optoelectronic applications due to their remarkable optical properties, their emission color tunability has not been investigated to any appreciable extent. In this work, double/triple CsPbX3perovskite quantum dots with precise ratios of Cl/Br or Br/I are synthesized and their luminescence (410–700 nm) is explored. A group of down-converted CsPbX3(X = Cl, Br, I) perovskite quantum dot light-emitting diode (LED) devices were constructed to demonstrate the potential use of such double/triple-halide CsPbX3perovskite quantum dots with full-spectrum luminescence. Based on density functional theory, we theoretically explored the properties of CsPbX3with double/triple anion atoms. The calculated band gaps provided strong support that the full-spectrum luminescence (410–700 nm) of double/triple CsPbX3can be realized with the change of the mixed-halide ratios, and hence that such PQDs are of potential use in optoelectronic devices.Keywords:perovskite quantum dots;light-emitting diode;density functional theory;band gap
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Zhihui He,Minjia Meng,Li Yan,Weihua Zhu,Fengquan Sun,Yongsheng Yan,Yan Liu,Shijuan Liu
Highly selective cellulose acetate (CA) blend imprinted membranes for salicylic acid (SA) was prepared by using phase inversion technique with sulfonated polysulfone (SPS) as a functional polymer, polyethylene glycol-4000 (PEG 4000) and ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as the additives. The membranes were characterized by several techniques including SEM, Raman, contact angle, membrane flux, and SA adsorption–desorption techniques. The SEM micrographs showed that the cross-sectional morphology of CA membranes was affected by polymer blend composition and applications of additives. Compared with the pure CA membrane the CA/SPS(90/10) + [BMIM]Cl membranes showed low contact angle, high membrane flux, strong adsorption capacity and high permeation selectivity. The experimental data of adsorption kinetic for CA/SPS(90/10) + [BMIM]Cl were well fitted to the pseudo-second-order kinetic model using multiple regression analysis. The selectivity coefficients of CA/SPS(90/10) + [BMIM]Cl-MIM for SA in relation to competition analogs p -hydroxybenzoic acid ( p -HB) and phenol were 5.8549 and 5.9062, respectively, which suggested that CA/SPS(90/10) + [BMIM]Cl-MIM had high selectivity and binding affinity for the template SA. Overall results suggest that [BMIM]Cl can be considered as an effective additive for CA imprinted membranes in the treatment of SA-contained water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Rui Liu,Peng Zhang,Huijie Li,Chunsun Zhang
Flow chemiluminescence (CL) is widely applied for detection of heavy metal ions in environment, but it is seldom used in economical, practical, or affordable settings because non- and minimally instrumented flow driving is difficult to achieve. Here, we first report a gravity and capillary force-driven flow CL (GCF-CL) lab-on-cloth device, toward development of low-cost, easy-to-use, portable, minimally-instrumented platform for determination of trivalent chromium [Cr(III)] in water, where a difference in height between two zones on cloth creates a fast flow of CL trigger solution. Wax screen-printing was used to fabricate ultra-low-cost cloth-based devices, and the light emitted from the Cr(III)-catalysed oxidation of luminol by H 2 O 2 was imaged using an inexpensive portable CCD camera. Under optical conditions, Cr(III) could be determined over the range of 0.01–100 mg/L, with a detection limit of 6.2 μg/L, an analysis time of less than 30 s per sample, and RSDs of 6.2%, 3.1% and 1.7% for 0.05, 0.5 and 5 mg/L Cr(III) (n = 5). The proposed GCF-CL lab-on-cloth was successfully applied for measuring Cr(III) in water samples, with recoveries of 100.67-111.70% and RSDs of 4.73–6.88%. Thus, the presented method should have the potential for portable field applications in environmental and public health fields.
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高影响因子
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