JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Qinghua Yang,Benxue Jiang,Shuilin Chen,Yiguang Jiang,Pande Zhang,Jun Wang,Shiqing Xu,Long Zhang
Al 2 O 3 : Er 3+ /Yb 3+ transparent ceramics codoped with Zn 2+ ions with intense upconversion and near infrared emission were prepared by conventional solid-state reaction and vacuum and hot isostatic pressing sintering. The effects of Zn 2+ incorporation to the structure, transparent, upconversion and NIR luminescence were discussed in detail. The as prepared Al 2 O 3 ceramics exhibited a total transmittance of ~ 75% in infrared regions (800–3300 nm) and ~ 50% in visible regions (500–800 nm). Under the excitation of a 980 nm laser diode , the as prepared Al 2 O 3 ceramics displayed two tense upconversion emission peaks of a green one centered at 550 nm and a red one centered at 660 nm and a tense near infrared emission peak centered at 1.532 µm, characteristic of Er 3+ emission. Compared with Er 3+ /Yb 3+ doped only, Zn 2+ codoped Al 2 O 3 :Er 3+ /Yb 3+ transparent ceramics showed higher upconversion and near infrared emission of ~ 11 times and ~ 4 times, respectively. The enhancement mechanism due to incorporation of Zn 2+ ions was also discussed in detail.
研究领域:
材料科学
·
光学材料
·
无机非金属材料
·
发光材料
·
陶瓷工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xin-yu Hu,Mao-xiang Jing,Hua Yang,Quan-yao Liu,Fei Chen,Wei-yong Yuan,Le Kang,Dong-hong Li,Xiang-qian Shen
Poor room-temperature ionic conductivity and lithium dendrite formation are the main issues of solid electrolytes. In this work, rod-shaped alumina incorporation and graphite coating were simultaneously applied to poly (propylene carbonate) (PPC)-based polymer solid electrolytes (Wang et al., 2018). The obtained alumina modified solid electrolyte membrane (Al-SE) achieves a high ionic conductivity of 3.48 × 10 −4 S/cm at room temperature with a wide electrochemical window of 4.6 V. The assembled NCM622/Al-SE/Li solid-state battery exhibits initial discharge capacities of 198.2 mAh/g and 177.5 mAh/g at the current density of 0.1 C and 0.5 C, with the remaining capacities of 165.8 mAh/g and 161.3 mAh/g after 100 cycles respectively. The rod-shaped structure of Al 2 O 3 provides fast transport channels for lithium ions and its Lewis acidity promotes the dissociation of lithium salts and release of free lithium ions. The lithiophilic Al 2 O 3 and Graphite form intimate contact with metallic Li and create fast Li + conductive layers of Li-Al-O layer and LiC 6 layer, thus facilitating the uniform deposition of Li and inhibiting Li dendrite formation during long-term cycling. This kind of composite Al-SE is expected to provide a promising alternative for practical application in solid electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
纳米复合材料
·
锂金属电池
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 23
·期 10
·2603-2611
·
IF 2.119
Chen Shaojie,Zhao Yanran,Yang Jing,Yao Lili,Xu Xiaoxiong
Three types of inorganic electrolytes [Li 10 GeP 2 S 12 (LGPS), 75Li 2 S·24P 2 S 5 ·1P 2 O 5 (LPOS), Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP)] with different particle sizes and electrochemical properties are selected as active fillers incorporated into poly(ethylene oxide) (PEO) matrix to fabricate hybrid solid electrolytes. The optimum composition of each filler is found in consideration of ionic conductivity. Their electrochemical characteristics are investigated. The optimal conductivities are 1.60 × 10 −5 , 1.18 × 10 −5 , and 2.12 × 10 −5 S cm −1 at room temperature for PEO-1%LGPS, PEO-1%LPOS, and PEO-20%LAGP, respectively. The electrochemical stability windows of these hybrid solid electrolytes are all above 5 V (vs. Li + /Li). The results show that these fillers have positive effects on the ionic conductivity, lithium ion transference number, and electrochemical stability. The relationship between the type of filler and electrochemical properties has been investigated. All-solid-state cells LiFePO 4 /Li are fabricated and present fascinating electrochemical performance with high capacity retention and good cycling stability. This work provides promising electrolytes prepared by a simple method.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
功能材料
·
锂电池技术
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 5
·1810-1819
·
IF 8.1
Xiao Hongbin,Qian Qingkai,Zang Zhigang
Recently, all-inorganic cesium lead halide (CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have been extensively investigated for photocatalytic carbon dioxide (CO 2 ) reduction reaction (CO 2 RR). However, because the pristine CsPbX 3 NCs suffer from severe radiative recombination, it is imperative to elaborately design heterostructures to separate electron-hole pairs for achieving efficient CO 2 RR. Herein, palladium (Pd) nanoparticles (NPs) are anchored on CsPbBr 3 NCs by a photo-assisted approach for the first time. The as-prepared CsPbBr 3 @Pd NCs not only build Schottky junctions at the CsPbBr 3 /Pd interfaces that promote the carrier separation and suppress the radiative recombination, but also exhibit lower energy barriers for photocatalytic CO 2 RR than pristine CsPbBr 3 NCs according to the density functional theory calculations. The electron consumption rate reaches a striking peak of 46.2 µmol g −1 h −1 by using CsPbBr 3 @Pd NCs as photocatalysts for CO 2 RR, which is 4.8-fold of the counterpart of pristine CsPbBr 3 NCs. This work not only presents a photo-assisted strategy for anchoring Pd NPs on CsPbBr 3 NCs, but also demonstrates the great potential of using CsPbBr 3 @Pd NCs for photocatalytic CO 2 RR.
研究领域:
材料化学
·
光催化
·
纳米材料
·
环境化学
·
能源化学
·
半导体物理
·
催化化学
✓ 已验证
DOI
高影响因子
CARBON
·
2018
·
IF 7.082
Xian Wang,Zuju Ma,Lulu Chai,Leqiong Xu,Ziyi Zhu,Yue Hu,Jinjie Qian,Shaoming Huang
Growing demand for clean and renewable energy resources has sparked intensive research on the development of an effective strategy to prepare non-noble metal electrocatalysts for oxygen evolution reaction (OER). Herein, we report a new type of N-doped carbon coated CoP particle/carbon nanotube composite (CNT-NC-CoP) has been synthesized by in situ nucleation and growth of ZIF-67 nanoparticles onto carbon nanotubes, which subsequently is treated with carbonization and phosphorization. Unique hierarchical structure endows as-obtained CNT-NC-CoP with high specific surface area , abundant exposed active sites, quick ion diffusion path , and good electrical conductivity , thus exhibiting the highest electrocatalytic capability with the low overpotential of 251 mV at the current density of 10 mA cm −2 and remaining long-term durability (overlapping LSV curve after 10 h). Besides, density functional theory (DFT) calculations reveal that CoOOH/graphene charged surfaces are more effective for facilitating intermediates adsorption and improving the corresponding catalytic activity .
研究领域:
材料化学
·
电化学
·
纳米材料科学
·
能源催化
·
功能材料
·
计算材料学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Xiao-Qian Wei,Wan-Ju Zhang,Lu Lai,Ping Mei,Li-Mei Wu,Yan-Qun Wang
The effects of cationic surfactants on the properties of Pickering emulsions stabilized by silica nanoparticles (nano-SiO 2 ) were investigated. The zeta potential , three-phase contact angle ( θ ), and dynamic interfacial tension (DIT) were measured to analyze the interaction between hydrophilic nano-SiO 2 and four different cationic surfactants (i.e., dodecyltrimethylammonium bromide [DTAB], bis-quaternary ammonium salts [BQAS-12], multiple quaternary ammonium salts [MQAS-12], and dimethyldioctadecylammonium bromide [DDAB-18]). All these surfactants can naturally improve the stability of Pickering emulsions induced by hydrophilic nano-SiO 2 . The nano-SiO 2 /MQAS-12 mixtures exhibited the best ability to stabilize the O/W emulsions, followed by nano-SiO 2 /BQAS-12 mixtures. The nano-SiO 2 /DDAB-18 mixtures can induce emulsion inversion from O/W to W/O. All emulsions exhibited excellent salt tolerance and acid-base resistance properties. Determining the zeta potential showed that nano-SiO 2 had the highest negative charge at the pH of 9.5. Thus, the surfactant molecules can be adsorbed remarkably on the nano-SiO 2 surface. Modification with different cationic surfactants can significantly increase the θ value of nano-SiO 2 , but the bilayers for DTAB-12, BQAS-12, and MQAS-12, except for DDAB-18, were adsorbed. DIT curves indicated that competitive adsorption of the surfactants occurred between the oil/water interface and nano-SiO 2 surface. The competitive adsorption of MQAS-12 was stronger than those of BQAS-12 and DTAB-12. The nano-SiO 2 /DDAB-18 mixture had an apparent induction region and required a considerable amount of time to reach equilibrium. The modified nano-SiO 2 was also not adsorbed in the oil/water interface spontaneously, which may be due to the large size of particles compared with small surfactant molecules.
研究领域:
胶体与界面化学
·
纳米材料科学
·
乳液工程
·
物理化学
·
表面科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 35
·29638-29645
·
IF 3.289
Xin Ge,Xinzhi Chen,Chao Qian,Shaodong Zhou
Ullmann type C–N coupling reaction catalyzed by copper(I) with D-glucosamine derivatives as promoters was studied by means of combined experimental/theoretical investigation. The catalytic role of D-glucosamine was addressed. In contrast with previous speculations, the amino group may not count in the catalytic cycle in which the oxidative addition/reductive elimination mechanism works. Experimental results are in good agreement with theoretical findings. Extensive work indicates the wide applicability of the C–N coupling strategy exploited in this work.
研究领域:
有机化学
·
催化化学
·
药物化学
·
计算化学
·
合成方法学
·
生物正交化学
·
金属有机化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2011
·Vol. 212
·期 21
·2378-2388
·
IF 2.437
Bin Yuan,Xiaohui He,Yiwang Chen,Kaiti Wang
Covalently immobilized silica-supported acetylacetonate dichloride palladium(II) precatalyst is prepared by the reaction of silica particles grafted acetylacetonate ligand further exchange with [Et 4 N] 2 PdCl 4 . The silica-supported catalyst is used in slurry polymerizations of norbornene (NB) to afford a highly productive NB addition polymerization system in combination with B(C 6 F 5 ) 3 cocatalyst. It exhibits productivity of 84 kg of PNB (mol Pd) −1 h −1 at the initial activity, and the catalyst deactivation kinetics in the early stage of polymerization are fitted well by the first-order deactivation kinetics. The obtained vinyl-type polynorbornene is confirmed to be nanosilica hybrid PNB nanocomposite by SEM, TEM with an energy dispersive spectrometer, TGA, and XRD.
研究领域:
高分子化学
·
纳米复合材料
·
催化化学
·
有机金属化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yinwei Fu,Xiaofeng Lei,Huiming Yin,Xizheng Liu
Flexible lithium–air batteries (LABs) with a redox mediator (RM) in the electrolyte demonstrate enhanced round-trip efficiency. However, their cycle performance is unsatisfactory due to severe corrosion of the Li metal anode. Herein, we propose a two step gelatinization strategy to fabricate a gradient RMs (including LiI, TMPD, and DMPZ) gel electrolyte, in which the bare electrolyte gelatinization on the Li surface and then the electrolyte contained RMs sequentially gelled on the formed gel. The RMs mainly distributed at the surface and anchored at the cathode side. By suppressing the shuttle of RMs in the electrolyte and alleviating the passivation of the Li anode, the mid-charging potentials can reach 3.44 and 4.08 V at the 15th cycle with and without the LiI mediator, respectively. The energy efficiency is 63% even at the 150th cycle, whereas the corresponding energy efficiency are only 47% and 51% for the LABs with liquid and normal gel electrolytes, respectively. Moreover, the cycle life of the battery containing the gradient gel electrolyte is three times longer than that with the liquid electrolyte. The gel electrolyte further offers the flexibility of the device, and the laminated cells thus fabricated can readily operate under harsh bending conditions.
研究领域:
电化学
·
能源材料
·
纳米材料
·
界面化学
·
储能技术
·
先进电池
·
功能高分子
·
柔性电子
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
Da-fa Yang,Xiang-jun Kong,Dan Gao,Hong-sheng Cui,Ting-ting Huang,Jin-xin Lin
Reactive disperse dyes with mono- and bi-acyl fluoride reactive groups have been synthesized using a simple and convenient method. The structures of these dyes have been defined by 1 H, 13 C and 19 F NMR. The cotton dyeing in supercritical carbon dioxide (Sc CO 2 ) with dyeing temperature varying from 60 °C to 120 °C and time between 1 h and 3 h and with the concentration of 0.5% owf (on weight of fabric) have been studied. Significant improvement of the color fastness of washing and rubbing has been observed owing to the covalent bond formed between the reactive group of dyes and the functional group of cotton fibers . Besides, the dyed fabrics possess favorable fastness properties , indicating the achievement of lower-temperature dyeing of cotton in Sc CO 2 . Additionally, the end products meet the garment dyeing standards as well. A mechanism of dyeing process is tentatively speculated meanwhile.
研究领域:
纺织化学
·
染整工程
·
绿色化学
·
高分子材料与纤维科学
·
环境友好染色技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2018
·
IF 1.742
Xuehua Zhang,Liang Yu,Wei Zhang,Fangren Hu,Yongjin Wang
PS microspheres emulsions with different PS diameters of 207 and 378 nm were prepared by using an emulsifier-free polymerization method. A novel secondary self-assembly method which combined the spin coating and the lifting-up method was used to prepare the close-packed PS MCC films. During the process, the PS MCC film was firstly assembled on a glass substrate by a spin coating technique. Secondly, the obtained PS MCC film was transferred on the air-water interface by immersing the PS glass substrate in water using a dip-coater. Thirdly, the floating close-packed PS MCC films on the air-water interface was transferred to a new glass substrate by using a lifting-up method. During the spin-coating and the self-assembly process, some SDS solution was added in the PS films to improve the uniformity of the PS layer. Effects of the spin-coating speeds, the SDS solution concentration and the lifting-up rates on the morphology of PS MCC films have been discussed. Scanning electron microscopy was used to observe the morphological properties of the PS colloidal crystal films. Results indicate that a relatively close-packed and large scale PS MCC films can be obtained when the spinning speed is 2000 rpm for 60 s, the SDS solution concentration is 2 wt% and the lifting-up rate is 2 mm/min. Furthermore, the polydimethylsiloxane soft mold was replicated from the-fabricated PS MCC films and was then imprinted onto the photosensitive hybrid film under UV-irradiation and thus the micro-lens arrays built in the photosensitive hybrid sol–gel film were obtained.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 16
·22776-22785
·
IF 4.527
Kaidan Wu,Yefeng Feng,Jin Ke,Bingwen Yang,Zhiling Guo,Deping Xiong,Miao He
Graphite nanosheets coated by LiF/SnO 2 composites are designed to obtain a lithium ion anode material with excellent performance. LiF nanoparticles play a significant role in improving the electrochemical performance by inhibiting electrolyte decomposition and providing excess Li sources during cycling. The obtained LiF@SnO 2 @C electrode shows an outstanding capacity of 951.9 mAhg −1 at 0.2 Ag -1 after 370 cycles and excellent long cycling performance of 650.0 mAhg −1 at 1.0 Ag -1 after 930 cycles. First-principles calculations demonstrate that F-doped SnO 2 (−2211.8 eV) has a lower free energy compared to SnO 2 (−1937.4 eV), resulting in a robust composite architecture that gives rise to high cycling stability.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
计算材料学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）