Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Zhou Zhifang,Huang Yi,Wei Bin,Yang Yueyang,Yu Dehong,Zheng Yunpeng,He Dongsheng,Zhang Wenyu,Zou Mingchu,Lan Jin-Le,He Jiaqing,Nan Ce-Wen,Lin Yuan-Hua
Thermoelectric materials can realize direct conversion between heat and electricity, showing excellent potential for waste heat recovery. Cu 2 Se is a typical superionic conductor thermoelectric material having extraordinary ZT values, but its superionic feature causes poor service stability and low mobility. Here, we reported a fast preparation method of self-propagating high-temperature synthesis to realize in situ compositing of BiCuSeO and Cu 2 Se to optimize the service stability. Additionally, using the interface design by introducing graphene in these composites, the carrier mobility could be obviously enhanced, and the strong phonon scatterings could lead to lower lattice thermal conductivity. Ultimately, the Cu 2 Se-BiCuSeO-graphene composites presented excellent thermoelectric properties with a ZT max value of ~2.82 at 1000 K and a ZT ave value of ~1.73 from 473 K to 1000 K. This work provides a facile and effective strategy to largely improve the performance of Cu 2 Se-based thermoelectric materials, which could be further adopted in other thermoelectric systems.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 4
·2940-2959
·
IF 2.993
Xiang Mei,Wu Dongfang
Hierarchically structured ETS-10-supported highly dispersed Co (Co/HMETS-10) is a promising catalyst to selectively catalyse hydrodeoxygenation (HDO) of lignin-derived phenolic compounds. It is shown that almost 100% guaiacol conversion and 96.9% cyclohexane yield are achieved under mild conditions. Co/HMETS-10 exhibits much higher activity and superior reusability due to the advantageous effects of its unique framework, hierarchical structure, Lewis acid sites and Co species. The hierarchically porous structure benefits mass transfer and facilitates the combination of the reacting substrate and acid, metal sites. The characteristic shape selectivity of ETS-10 structure and moderate amount of Lewis acid lead to the high HDO selectivity. In addition, compared with Ni and Fe, Co is more inclined to function in hydrogenolysis of C aryl –OMe bond, thereby improving the catalytic performance. Further HDO experiments indicate the excellent catalytic performance and extensive applicability in selectively deep deoxygenation of various lignin model compounds for production of cycloalkanes.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Meng Jiashen,Yao Xuhui,Hong Xufeng,Zhu Lujun,Xiao Zhitong,Jia Yongfeng,Liu Fang,Song Huimin,Zhao Yunlong,Pang Quanquan
Conventional solid-to-solid conversion-type cathodes in batteries suffer from poor diffusion/reaction kinetics, large volume changes and aggressive structural degradation, particularly for rechargeable aluminium batteries (RABs). Here we report a class of high-capacity redox couples featuring a solution-to-solid conversion chemistry with well-manipulated solubility as cathodes—uniquely allowed by using molten salt electrolytes—that enable fast-charging and long-lived RABs. As a proof-of-concept, we demonstrate a highly reversible redox couple—the highly soluble InCl and the sparingly soluble InCl 3 —that exhibits a high capacity of about 327 mAh g −1 with negligible cell overpotential of only 35 mV at 1 C rate and 150 °C. The cells show almost no capacity fade over 500 cycles at a 20 C charging rate and can sustain 100 mAh g −1 at 50 C. The fast oxidation kinetics of the solution phase upon initiating the charge enables the cell with ultrafast charging capability, whereas the structure self-healing via re-forming the solution phase at the end of discharge endows the long-term cycling stability. This solution-to-solid mechanism will unlock more multivalent battery cathodes that are attractive in cost but plagued by poor reaction kinetics and short cycle life.
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高影响因子
JOURNAL OF FLUORESCENCE
·
2022
·Vol. 33
·期 2
·575-586
·
IF 2.525
Zhou Boxin,Han Yunlong,Liu Jingyu,Cheng Kai,Dong Mingdong,Tang Xu
Hypochlorite is an important biological reactive oxygen species, which plays a pivotal role in various life activities. Excessive presence in the human body or excessive intake in life causes a series of diseases. To monitor the hypochlorite level in living cells, organisms and environment water samples, we herein designed and synthesized three organic small molecule fluorescent probes with different recognition sites based on nitrile biphenyl. Through performance comparison, it was found that probe A-HM exhibited the best detection performance for hypochlorite with a low detection limit of 2.47 × 10 –6 M. The introduction of hypochlorite will induce probe fluorescence A-HM to turn on, and the fluorescence colour will change from colourless to green. The application of A-HM in biological systems has been demonstrated by the imaging monitoring of hypochlorite in MCF-7, L929 cells and zebrafish. Furthermore, A-HM was also used for the accurate determination of the hypochlorite level in real water samples with high sensitivity and good recoveries.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2051-2065
·
IF 11.806
Feng Yu,Li Yingchun,Almalki Abdulraheem S. A.,Meng Xiangning,Alhadhrami A.,Ye Xinming,Ibrahim Mohamed M.,Guo Xin,Algadi Hassan,Huang Mina,Winchester William,Wang Zhe
A PBSeT copolyester was synthesized by introducing a polar amide unit into the molecular chain, coordinating with decyldiamine through hydrogen bonds between the amide groups and hydrogen atoms on the chains. Two-step esterification and one-step polycondensation melt polymerization were adopted. ATR-FTIR and HNMR demonstrated the successful introduction of the amide unit. The effect of adding an amide unit on many properties was also discussed. Due to the formation of hydrogen bonds, both the force of molecular chain and the crystallinity increased by 5.91%. Consequently, yield and tear strength increased by 40.7% and 74.8%, respectively. The addition of 1,10-decyldiamine has no significant effect on the glass transition temperature and thermal stability of polyester. The introduction of an amide unit decreased free volume and increased combined crystallinity, which also increased the water vapor barrier. At the same time, PBSeT copolyester still maintained its biodegradability under hydrolysis and enzymatic hydrolysis. Addtionally, the change of surface morphology upon the degradation was examed by AFM. This work discussesed a synthesis method of PBSeT copolyester strengthened by the hydrogen bond. The modified material has higher crystallinity, better mechanical properties, and a better water vapor barrier while maintaining certain biodegradation ability. It can be used in disposable products, food packaging, and other fields.
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高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 102
·期 21
·9159-9170
·
IF 3.34
Mei Jingxia,Zhang Nan,Yu Yuanyuan,Wang Qiang,Yuan Jiugang,Wang Ping,Cui Li,Fan Xuerong
Proteases can cause unacceptable fiber damage when they are singly applied to wool anti-felting treatment which can make wool textiles machine-washable. Even if protease is attached by synthetic polymers, the modified protease plays a limited role in the degradation of keratin with dense structure consisting of disulfide bonds in the scales. Here, to obtain “machine-washable” wool textiles, a novel “trifunctional protease” with reducibility, hydrolysis, and localization is developed by means of covalent bonding of protease molecules with poly (ethylene glycol) bis (carboxymethyl) ether (HOOC-PEG-COOH) and l -cysteine using carbodiimide/N-hydroxysuccinimide (EDC/NHS) coupling, aiming at selectively degrading the scales on the surface of wool. The formation of polymer is confirmed with size exclusion chromatography (SEC) and Fourier transform infrared spectroscopy (FT-IR). Ellman’s test and fluorescence microscopy reveal that the modified protease can reduce disulfide bonds and restrict hydrolysis of peptide bonds on the wool scales. Furthermore, when applied to wool fabrics, the modified protease reach better treatment effects considering dimensional stability to felting (6.12%), strength loss (11.7%) and scale dislodgement proved by scanning electron microscopy (SEM), alkali solubility, wettability, and dyeability. This multifunctional enzyme is well-designed according to the requirement of the modification of wool surface, showing great potential for eco-friendly functionalization of keratin fibers rich in disulfide linkage.
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高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 148
·期 1
·144-153
·
IF 2.799
Liu Yong,Liu Weihua,Shao Xiaonan,Wang Jianhong,Li Xiying,Zhang Haiyan
Abstract In this work, dicationic acidic heteropolyanion-based ionic liquids were synthesized, and used in transesterification reaction of methyl acetate with isooctyl alcohol for producing isooctyl acetate. Compared with H 2 SO 4 , and H 3 PW 12 O 40 , [Bis-BsImB][HPW 12 O 40 ] and [Bis-Bs-DABCO][HPW 12 O 40 ] shown excellent catalytic performance. The reaction kinetics and chemical equilibrium of the transesterification catalyzed by [Bis-BsImB][HPW 12 O 40 ] and [Bis-Bs-DABCO][HPW 12 O 40 ] were investigated. The effects of reaction temperature, initial reactant molar ratio, and catalyst concentration on the kinetics were studied in detail. The kinetic data were successfully correlated by a pseudohomogeneous model in the temperature range of 328.15 − 343.15 K. The simulation values obtained by the kinetic model were in good agreement with the experimental data. Moreover, [Bis-BsImB][HPW 12 O 40 ] and [Bis-Bs-DABCO][HPW 12 O 40 ] could be easily recovered and reused five times without any obvious decrease in catalytic activity. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 24
·21078-21087
·
IF 2.324
Yang Zhenglong,Yu Jing,Fu Kangyu,Tang Fengfeng
The asymmetrical zinc phthalocyanine–multiwalled carbon nanotube hybrid material (aZnPc–MWCNT) were successfully prepared by in situ click chemistry of 4-(m-tolyloxygen)-5-nitrophthalonitrile and 4-azide-phthalonitrile modified MWCNT precursors in the Cu(I)/DBU catalyst system. In situ click chemistry reactions and covalent bonds between aZnPc and MWCNT were confirmed by FT-IR, UV–Vis and fluorescence spectra. The aZnPc–MWCNT red-shifted 12–690 nm compared with pristine ZnPc. The microstructure and morphology of aZnPc–MWCNT were investigated by TEM, SEM and AFM. The solubility of aZnPc–MWCNT could be significantly improved. After the ZnPc were uniformly distributed on the surface of MWCNTs, the aggregation of aZnPc–MWCNT was significantly reduced. The thermal degradation temperature of aZnPc–MWCNT was 72.8 °C higher than that of pristine ZnPc. TG results also indicated that the ZnPc content of aZnPc–MWCNT is 14.4%. It is expected that novel organic–inorganic donor–acceptor hybrid material possessing good solubility, optical and thermal stability properties would be obtained, and new materials for the preparation of organic electronic devices should be provided.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 8
·4353-4368
·
IF 1.369
Yuan Hong,He Jie,Li Ruilan,Ma Xiaoqin
The solid acid catalysts SO 4
2− /TiO 2 were prepared by the impregnation technique under two preparation conditions which were different in calcination temperature and concentration of impregnation solution of H 2 SO 4 . The characterization was carried out by using Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), temperature programmed desorption of NH 3 (NH 3 -TPD), N 2 -BET, X-ray fluorescence and thermal gravity (TG)–differential scanning calorimetry (DSC). The characteristic peaks in the FTIR spectrum were essentially the same within the calcination temperature range of 400–600 °C. The XRD results indicated that the sample could show partial specific peaks of the anatase phase as the calcination temperature was higher than 400 °C. The obvious strong acid and superacid sites of the prepared SO 4
2− /TiO 2 were conformed by the NH 3 -TPD results. The BET surface areas of 102–206 m 2 /g were measured by the N 2 -BET method, and the pore size distributions were essentially mesoporous. The TG–DSC results showed that SO 4
2− /TiO 2 would decompose at about 500 °C in the air. The solid acid SO 4
2− /TiO 2 were used for the epoxidation of castor oil. The lowest iodine value of the product was 52.65/100 g when the reaction temperature was 65 °C, reaction time was 10 h and catalyst loading was 15 wt.%.
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高影响因子
Journal of the Iranian Chemical Society
·
2020
·Vol. 18
·期 1
·159-166
·
IF 1.552
Xu Wenjing,Ye Liuqing,Li Wei,Zhang Zhanying
MIL-101(Cr) morphology was modulated by addition of sodium stearate (SS) and cetyltrimethylammonium bromide (CTAB) in the precursor solution. The resulting SS modulation MIL-101(Cr) (SS@MIL-0.1 and SS@MIL-0.2) are quasi-spherical, and the CTAB modulation MIL-101(Cr) (CTAB@MIL-0.2) has a regular octahedral shape, similar to the pure MIL-101(Cr). Their particles after modification are reduced, and the structures of MIL-101(Cr) crystals are not destroyed. These modifications improve their adsorption capacity for methyl orange (MO). The maximum adsorption capacity of MO on the CTAB@MIL-0.2 and SS@MIL-0.2 can reach 645.2 and 454.5 mg g −1 , respectively, superior to many adsorbents reported in the literatures. The CTAB@MIL-0.2 and SS@MIL-0.2 exhibit outstanding selective adsorption of MO from the mixed solution of MO and methylene blue (MB). Our work may provide a feasible method to obtain MIL-101(Cr) with different morphologies, especially quasi-spherical, and open up a new doorway for utilizing MIL-101(Cr).
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METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2019
·Vol. 50
·期 10
·4827-4838
·
IF 1.985
Liu Jun-Kai,Zhang Guo-Hua,Sun Guo-Dong
We propose a process to produce ultrafine W-10 wt pct Cu composite powders by reducing the mixtures of copper tungstate (CuWO 4 ) and tungsten trioxide (WO 3 ) (from the calcination of a mixture of ammonium paratungstate and copper nitrate trihydrate) with carbon black and hydrogen. First, ultrafine pre-reduced tungsten-copper (W-Cu) powders containing a small amount of WO 2 were produced by reducing mixtures of CuWO 4 and WO 3 with insufficient carbon black; then the obtained products were further reduced by hydrogen to remove the residual oxygen. This method provides a simple and low-cost route to prepare ultrafine W-10 wt pct Cu composite powders. The composite powders were sintered at different temperatures [1323 K (1050 °C), 1373 K (1100 °C), 1423 K (1150 °C), 1473 K (1200 °C), and 1523 K (1250 °C)] for 3 hours. A maximum densification of the obtained compact was achieved at a sintering temperature of 1523 K (1250 °C), with a relative density, Vickers hardness and thermal conductivity of the W-10 wt pct Cu composites of 97.8 pct, 365 HV and 165 W/m K, respectively.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 7
·1961-1975
·
IF 2.482
Wei Congcong,Zhang Wei,Wang Xinpeng,Li Aihong,Guo Jianping,Liu Bo
Abstract Here, g-C 3 N 4 /TiO 2 photocatalysts with mesoporous structure and intimate interfacial connection were synthesized via the facile pyrolysis of g-C 3 N 4 /MIL-125 composites. The photocatalytic H 2 evolution reaction was performed to examine the photocatalytic activity of obtained photocatalysts. Under the UV–vis light irradiation, the average H 2 evolution rate of g-C 3 N 4 /TiO 2 sample with optimal g-C 3 N 4 loading content (4.12wt%) was most increased by up to 0.606 mmol·g −1 ·h −1 , a value which transcended that of as-prepared g-C 3 N 4 (0.138 mmol·g −1 ·h −1 ) and mesoporous TiO 2 (0.244 mmol·g −1 ·h −1 ) by a factor of 4.41 and 2.48, respectively. The improvement in photocatalytic activity of g-C 3 N 4 /TiO 2 composites was explained by the synergistic effect between large specific surface area, decreased energy band gap and intimate interface contact. This study demonstrated a new approach for the preparation of binary mesoporous heterojunction photocatalysts. Graphical Abstract
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