CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Qing Xuan Shi,Hui Jie Pei,Na You,Jingyi Wu,Xiao Xiang,Qing Xia,Xiao Lin Xie,Shang Bin Jin,Yun Sheng Ye
The shuttling of polysulfides during discharging/charging processes is a major challenge that severely hinders the widespread use of lithium-sulfur batteries (LiSBs). Here, a group of scaled-up covalent triazine frameworks (CTFs) were explored under relatively mild reaction conditions to reduce reaction related interactions. Triazine shows good chemical compatibility with lithium polysulfide though its pyridinic and pyrrolic nitrogen groups, while hierarchical microporous structures interact physically as a blocking layer. Moreover, the dual chemical/physical functional CTFs act as an ionic sieves owing to their two-dimensional microporous structures that selectively sieve desired lithium ions, while effectively inhibiting soluble polysulfides reaching the lithium anode. As a result, the CTFs coated on commercial separator enhance battery performance, through improved active material utilization, high reversible specific capacity (1249 mA h g −1 at 0.5 C), an ideal rate performance of 802 mA h g −1 at 2 C, good cycling stability with a low capacity fade-rate of 0.052% per cycle over 800 cycles at 1 C, good anti-self-discharge behaviour and enhanced protection of the lithium anode.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhenqi Cui,Jia Yao,Tao Mei,Shiyuan Zhou,Baofei Hou,Jing Li,Jinhua Li,Jianying Wang,Jingwen Qian,Xianbao Wang
In our study, TiC-TiO 2 /S composite was successfully prepared with a simple and effective method. For this special micro-mesoporous structure, TiC-TiO 2 can be used as an efficient sulfur storing material, and also restrain the volume expansion of sulfur to a certain degree for its suitable specific surface area. TiO 2 and TiC can suppress the diffusion of polysulfides due to their strong interaction with polysulfides . At the same time, TiC also can remedy the nonconductive defect of sulfur for its good conductivity. With the help of above advantages, the TiC-TiO 2 /S cathode delivers an initial discharge specific capacity of 1218 mAh g −1 at 1 C (1 C = 1675 mA g −1 ) with the sulfur loading of 1.5 mg cm −2 . And when cycles at 0.5 C, a stable capacity of 714 mAh g −1 can be maintained after 500 cycles accompanied with the sulfur loading of 1.1 mg cm −2 .
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2018
·
IF 1.946
Amin Khan,Li Wang,Haojie Yu,Muhammad Haroon,Raja Summe Ullah,Ahsan Nazir,Tarig Elshaarani,Muhammad Usman,Shah Fahad,Kaleem-ur-Rehman Naveed
Three novel polymers (P(FHEMA- co -MAAT)s) having redox and photoresponsive moieties were prepared by free radical polymerization . The structures and molecular weights of the synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) respectively. Thermal properties, optical features and electroactive properties were studied with the help of thermogravimetric (TG), differential thermogravimetric (DTG) analysis, ultraviolet-visible spectroscopy (UV-vis) and cyclic voltammetry (CV). It was seen that synthesized copolymers had excellent redox and photoresponsive properties. These results exhibited that these polymers can be applied further for redox/photo responsive information storage devices.
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MATERIALS CHEMISTRY AND PHYSICS
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2018
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IF 2.21
Meng Li,Zipeng Xing,Jiaojiao Jiang,Zhenzi Li,Junyan Kuang,Junwei Yin,Ning Wan,Qi Zhu,Wei Zhou
In-situ Ti 3+ /S doped high thermostable anatase TiO 2 nanorods using ethanediamine-modified TiOSO 4 as precursor are synthesized under 700 °C calcination , then combined with controllable in-situ solid-phase reaction method, calcined at 350 °C in argon. The outcomes declare that the obtained photocatalyst with a high crystallinity is effectively doped with S element and Ti 3+ species, and synchronously possesses one-dimensional (1D) anatase nanorods structure with length of ∼ 2–5 μm and width of ∼0.5–1 μm. The S and Ti 3+ co-doped 1D nanorod with a narrowed bandgap (2.56 eV) stretches the optical response range to visible-light. The visible-light-driven photocatalytic degradation efficiency of methyl orange and H 2 production rate for Ti 3+ /S-TiO 2 nanorods are as high as 96% and 166 μmol h −1 g −1 , showing about 6 times greater than 600-TR (TiO 2 nanorods). This is be ascribed to the synergistic reaction of S and Ti 3+ species co-doping narrows the bandgap and promotes the separation efficiency of photoexcited carriers, and the one-dimensional structure favors the transportation of photogenerated charge carriers. Hence, the prepared photocatalyst will have a great latent application prospect in fields of energy and environment.
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INORGANIC CHEMISTRY
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2015
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IF 4.762
Bo Zhang,Mei-Ling Feng,Hong-Hua Cui,Cheng-Feng Du,Xing-Hui Qi,Nan-Nan Shen,Xiao-Ying Huang
Among numerous heterometallic chalcogenidoantimonates, relatively a few amine-directed Ge–Sb–S compounds have been synthesized. Presented here are the solvothermal syntheses, crystal structures, and ion-exchange, optical, and photocatalytic properties of two novel amine-directed Ge–Sb–S compounds, namely, [CH3NH3]20Ge10Sb28S72·7H2O (1) and [(CH3CH2CH2)2NH2]3Ge3Sb5S15·0.5(C2H5OH) (2). The structure of 1 features an unprecedented two-dimensional Ge–Sb–S double-layer composed of two twofold rotational symmetry-related thick [Ge8Sb28S72]n28n– single layers adhered via vertex-sharing [GeS4] tetrahedra. Compound 2 features a unique [Ge3Sb5S15]n3n– slab perforated with large elliptic-like windows. Remarkably, compound 1 exhibited excellent Cs+ ion-exchange property despite the presence of excess competitive cations, such as Na+, K+, Mg2+, and Ca2+ ions. In addition, compound 1 displayed visible-light-driven photocatalytic activity for degradation of rhodamine B.
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PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2014
·Vol. 119
·期 3
·1913-1921
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IF 2.206
Wang Hui,Wang Jun,Feng Tian-tian,Ramdani Noureddine,Li Yue,Xu Xiao-dong,Liu Wen-bin
A series of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s (co-PEKKs) were successfully synthesized, in which the co-PEKKs were prepared with different molar ratios of 2,7-dihydroxy-9-fluorenone to bisphenol-A. The obtained phenol-ended co-PEKKs reacted with formaldehyde and n -butylamine to yield the benzoxazine-endcapped co-PEKKs (B-PEKKs). The structure of these oligomers was studied by Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy, and the molecular mass of these phenol-ended co-PEKKs was detected by gel permeation chromatography. The thermal behaviors of these B-PEKKs were determined by differential scanning calorimetry. In addition, the thermal and dynamic mechanical properties of the polymer films were investigated by thermogravimetric analysis and dynamic mechanical analysis. The results indicate that the incorporation of co-PEKKs within the benzoxazine backbone considerably improves the toughness of the fluorene-containing polybenzoxazines without much sacrifice of their thermal properties. Furthermore, as the content of 2,7-dihydroxy-9-fluorenone increases, the T
5 values decrease, while the T
g values and char yields of the prepared polymers increase to reach their highest values at 256 °C and 64 %, respectively.
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GREEN CHEMISTRY
·
2014
·Vol. 17
·期 2
·1269-1275
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IF 6.852
Qingwen Tian,Lijian Huang,Wangen Zhao,Yanchun Yang,Gang Wang,Daocheng Pan
Aqueous solution deposition of metal chalcogenide semiconductor thin films is considered a green and low-cost approach. However, it is hard to find a general aqueous solution approach to deposit various kinds of high-quality metal sulfide thin films. Here, we describe a green and robust ammonium thioglycolate aqueous solution approach, and fifteen types of metal sulfide precursor solutions (metal = Cu, Zn, Sn, Ge, In, Sb, Mg, Cd, Mn, Bi, Fe, Ni, Li, Na, K) can be prepared using metal oxides or metal hydroxides as raw materials at room temperature under an air atmosphere. Moreover, elemental sulfur and selenium can also be highly dissolved. By this green route, high quality CZTS nanocrystal thin films can be deposited by directly coating the mixed Cu, Zn, and Sn precursor solutions without the need for complex nanocrystal synthesis. The remarkable power conversion efficiency of 6.62% was achieved, which is the highest value for aqueous solution deposited CZTSSe thin film solar cells.
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ECS Journal of Solid State Science and Technology
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2015
·Vol. 5
·期 2
·P21
·
IF 1.558
Bin Hu,Wen Luo,Lin Jin,Zengchen Liu,Mengnan Wang,Liuyang Zhou,Chunyang Li
Two novel carbazole-3, 4-ethoxylenedioxythiophene (EDOT) derivatives containing acceptor groups such as benzonitrile and phthalonitrile were synthesized and characterized. Both the monomers could be electrochemically polymerized and form stable electroactive polymer films. Spectroelectrochemical technique were performed to investigate the electrochemical and optical changes of the resulting polymer films, multi-electrochromic properties upon different applied potentials suggested the effect of the benzonitrile and phthalonitrile units and their potential applications in electrochromic device. Furthermore, scanning electron micrographs (SEM) were used to study the microstructure morphology of polymer films.
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MOLECULES
·
2015
·Vol. 20
·期 9
·17378-17392
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IF 2.416
Jing Zhang,Jingjiang Liu,Yong Zuo,Rongmin Wang,Yubing Xiong
In this study, thermo-responsive polymeric nanogels were facilely prepared via one-step cross-linking copolymerization of ethylene glycol dimethacrylate/divinylbenzene and ionic liquid (IL)-based monomers, 1,n-dialkyl-3,3′-bis-1-vinyl imidazolium bromides ([CnVIm]Br;n= 6, 8, 12) in selective solvents. The results revealed that stable and blue opalescent biimidazolium (BIm)-based nanogel solutions could be obtained without any precipitation when the copolymerizations were conducted in methanol. Most importantly, these novel nanogels were thermo-response, and could reversibly transform to precipitation in methanol with temperature changes. Turbidity analysis and dynamic light scatting (DLS) measurement illustrated that PIL-based nanogel solutions presented the phase transform with upper critical solution temperature (UCST) in the range of 5–25 °C. The nanogels were characterized using Fourier transform infrared (FTIR), thermogravimetric analyses (TGA), and scanning electron microscopy (SEM). In addition, BIm-based nanogels could also be used as highly active catalysts in the cycloaddition reaction of CO2and epoxides. As a result, our attributes build a robust platform suitable for the preparation of polymeric nanomaterials, as well as CO2conversion.Keywords:ionic liquids;thermo-response;nanogels;cross-linking polymerization;UCST;CO2conversion
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CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 32
·期 8
·771-776
·
IF 1.04
Mo Sun,Hengyi Zhang,Xinyue Hu,Bowen Liu,Yu Liu
A hyperbranched supramolecular polymer (HSP) is constructed based on the intermolecular inclusion complexation of bridged tris(permethyl- β -cyclodextrin) with Mn III -porphyrin bearing poly(ethylene glycol) (PEG) side chains (Mn III -TPP), and characterized by UV/vis absorption spectroscopy, isothermal titration calorimetry (ITC), NMR, dynamic light scattering (DLS), atomic force microscopy (AFM) and transmission electron microscopy (TEM), respectively. The presence of permethyl- β -cyclodextrin can stabilize the low-valent Mn II -TPP. In vitro cell experiment indicates that this HSP has no remarkable cellular toxicity against NIH 3T3 cells. In vitro MR imaging experiment indicates a slightly increased T 1 relaxivity for this HSP compared to that for the linear supramolecular polymer.
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JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
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2013
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IF 2.823
Jian-Yong Zheng,Jia-Yu Wu,Yin-Jun Zhang,Zhao Wang
The mycelium of Aspergillus oryzae WZ007 was successfully developed to kinetic resolution of ( R , S )-ethyl-2-(4-hydroxyphenoxy) propanoate (( R , S )-EHPP) for production of ( R )-ethyl-2-(4-hydroxyphenoxy) propanoate (( R )-EHPP). The key biocatalytic process parameters (pH, temperature, rotation speed and substrate concentration) were optimized. Under the optimum conditions, the optical purity of ( R )-EHPP was improved up to >99% when the conversion was above 49%. A. oryzae WZ007 whole-cell lipase exhibited high reaction capacity, enantioselectivity and good reusability. The tolerable substrate concentration was 0.5 mol/L, and dry mycelium of A. oryzae WZ007 maintains over 80% of its initial activity after eight repeating cycles. Therefore the enzymatic preparation of ( R )-EHPP route was suitable for industrial application.
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RSC Advances
·
2015
·Vol. 5
·期 113
·93415-93422
·
IF 3.84
Jie Wang,Haibing Wei,Shanzhong Yang,Huagao Fang,Pei Xu,Yunsheng Ding
A series of poly(phenylene oxide)s (PPOs) bearing a flexible pendent imidazolium cation were prepared by an azide–alkyne cycloaddition between azidomethylated PPO and a novel alkyne-containing imidazolium, and their structures were confirmed by 1H NMR, 13C NMR, and FT-IR. The corresponding anion exchange membranes (AEMs) showed distinct hydrophobic/hydrophilic phase-separated morphology at higher imidazolium content, as evidenced by AFM and SAXS techniques, which favors for the construction of interconnected hydroxide transport channels. As a result, the as-prepared AEMs exhibited higher conductivity (95 mS cm−1, 80 °C, 100% RH) than conventional imidazolium benzylic-type AEM (55 mS cm−1, 80 °C, 100% RH) with even lower IEC. Furthermore, the introduction of a 1,2,3-triazole moiety into the polymer side chain does not compromise its thermal and alkaline stability. This investigation demonstrated that the “click chemistry” strategy will benefit further tailoring of high performance AEMs with “side-chain-type” architectures.
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