JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 15
·9344-9355
·
IF 4.22
Fang Dan,Yan Bin,Agarwal Seema,Xu Wenhui,Zhang Qian,He Shuijian,Hou Haoqing
The separator is an important component for energy storage devices. At present, the membranes for supercapacitors are rare, especially the ones that work with an alkaline electrolyte. Herein, a type of flexible and highly porous polymer hybrid nanofiber membrane was prepared via a facile electrospinning process and served as a separator for supercapacitor’s work with strong alkaline electrolyte. As obtained, poly[poly(2,5-benzophenone)]bibenzopyrrolone/polyimide (PBPY/PI) membrane showed good thermal stability, high mechanical strength, large electrolyte uptake (452%), and fast ion conductivity (0.68 mS/cm). Moreover, PBPY/PI membrane exhibited excellent alkali resistance. The supercapacitor assembled with PBPY/PI membrane showed much better performance than those assembled with a commercial polypropylene membrane and electrospun polyimide nanofiber membrane and was found without capacitance loss after charge/discharge at 30 A/g for 10,000 cycles at 80 °C. The PBPY/PI membrane is a good candidate with temperature resistance and alkali resistance for high-performance supercapacitors.
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高影响因子
APPLIED COMPOSITE MATERIALS
·
2021
·Vol. 28
·期 1
·219-233
·
IF 2.181
Wang Pei,Deng Guanyu,Zhu Hongtao,Yin Jian,Xiong Xiang,Zhang Hongbo
To improve electrical conductivity of the carbon-based pantograph strip, a sliding contact material of pyrolytic carbon (PyC) coated-copper foam/carbon composite was fabricated by chemical vapor deposition technology, followed by densifying processes of furan resin impregnation and carbonization. Morphology, electrical conductivity, wear and friction behavior of the composites are investigated to clarify the effect of PyC thickness (from 0 μm to 280 μm) on tribological behaviors and current transfer characteristic. The results show that there is a good interface combination between copper foam and resin carbon matrix in the composites after the improvement of interface wettability by inserting PyC layer. The composite has great advantages in electrical conductivity and density due to the copper foam and PyC layer with three-dimensional structure. With increasing the PyC thickness, both electrical conductivity and wear resistance of the composite have steadily increasing tendency, but friction coefficient has no obvious change. In addition, an analytical model is developed to explore current transfer mechanisms of the PyC-copper foam/carbon composite, and the theoretical predictions are in agreement with the experimental observations, in term of electrical conductivity and porosity of composite preform.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7397-7408
·
IF 4.22
Ma Yingyi,He Zian,Liao Ziwei,Xie Junwen,Yue Hongyan,Gao Xin
It is important for the development of high-performance dielectric materials to reduce the dielectric constant and water uptake simultaneously, with the maintenance of mechanical properties. Herein, sandwich-type composite film was prepared through coating the both sides of flat polyimide (PI) film with polyhedral oligomeric silsesquioxanes (POSS) contained hierarchical porous structure using the microemulsion method, in which water droplets were used as the template for patterned pores. Due to the introduction of two layers of hierarchical porous structure with patterned pores and POSS, the dielectric constant of PI film was significantly reduced, accompanied by the low dielectric loss. In addition, the water uptake was also greatly reduced, thus contributing to its excellent durability under high humidity. More importantly, even with the introduction of porous structure, the mechanical properties of PI film can still be maintained, or even improved by optimizing POSS content. Through varying the POSS content from 10 to 50%, low dielectric constant of 2.28–2.42, dielectric loss of 0.005–0.009, water uptake of 0.56–0.62%, increment of dielectric constant under high humidity of 1.19–2.35%, with 26–32%, 43–69%, 77–80% and 31–37% of reduction, respectively, compare to flat PI film were achieved. These results indicate the potential of our sandwich-type composite film as low dielectric material in microelectronics.
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高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-11
·
IF 3.998
Dong Zijun,Chen Guanhan,Li Mu,Sun Feiyun,Jiang Chengchun,Bharti Bandna
Iodinated contrast media (ICM), which was widely used in medical imaging and was difficult to remove by conventional wastewater treatment methods, attained much attention due to its potential environmental impacts. Herein, iopamidol (IPM), one typical compound of ICM, was found to be rapidly degraded by ferrous activated persulfate oxidation (Fe(II)/PS) as compared with PS or Fe(II) alone. With a persulfate concentration of 1 mmol L −1 , n(Fe(II))/n(PS) of 1:10, and a pH of 3.0, 78% IPM was degraded within 60 min, with a degradation rate of 0.1266 min −1 . It was demonstrated that IPM degradation and deiodination were favored by a high temperature, while affected positively by acidic and neutral conditions. Radical quenching experiments and Electron Paramagnetic Resonace (EPR) spectra showed that the combined effects of SO 4 − · and · OH contributed dominantly to degrade IPM, while the · OH played an essential role during the degradation reaction. Through the Discrete Fourier Transform quantum chemical calculation, the possible reaction pathways for the oxidation of IPM by · OH are as follows: IPM-TP651-TP667-TP541-TP557, IPM-TP651-TP525-TP557, IPM-TP705-TP631-TP661, and IPM-TP705-TP735. The obtained results showed that IPM could be degraded effectively by Fe(II)/PS system, giving a promising technique for IPM removal from water.
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PubMed
高影响因子
Nano Research
·
2021
·Vol. 14
·期 8
·2846-2852
·
IF 8.897
Wang Dongdong,Al-Mamun Mohammad,Gong Wanbing,Lv Yang,Chen Chun,Lin Yue,Wang Guozhong,Zhang Haimin,Zhao Huijun
The cyclopentanone and derivatives are a class of crucial fine chemicals for various industries and currently produced by conventional petrochemical synthetic routes. Here, we demonstrated a new synthetic approach to directly fabricate N-doped carbon nanotube (N-CNTs) networks with confined Co nanoparticles from Co 2+ -impregnated bulk g-C 3 N 4 as high performance hydrogenation rearrangement (HR) catalyst to efficiently convert a wide spectrum of biomass-derived furanic aldehydes to the corresponding cyclopentanones in water under a record-low H 2 pressure of 0.5 MPa and mild temperature. We unveiled a Co-catalysed bulk g-C 3 N 4 decomposition/carbonisation CNTs formation mechanism. A new HR pathway was also unveiled.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 10
·6327-6336
·
IF 4.22
Yang Ziyin,Bai Xiao
Searching for novel sensing material for highly sensitive nonenzymatic detection of glucose is important. In this paper, it is the first time that AgCoO 2 /MWCNTs was exploring as electrocatalyst for glucose oxidation. Structural characterizations reveal that AgCoO 2 and MWCNTs are interconnected with a three-dimensional porous structure, which leads to attractive electrocatalytic activity for glucose oxidation. The sensor based on AgCoO 2 /MWCNTs is found to exhibit excellent analytical performances for glucose with an extremely high sensitivity of 8214.3 μA mM −1 cm −2 and a wide linear range of four orders of magnitude. Such results indicate that AgCoO 2 /MWCNTs can be employed as a promising material for electrochemical sensing of glucose and also opens avenues for applications of AgCoO 2 in the fields of electrochemical sensing.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6704-6718
·
IF 4.22
Liu Xiao,Zhang Wenyi,Mao Linqiang,Yin Yong,Hu Linchao
Abstract FeOCl-MoS 2 was synthesized via calcination, which possessed excellent adsorption performance for methyl orange (MO). The characterization results showed that the FeOCl-MoS 2 was formed between MoS 2 and FeOCl phases, while a remarkable improvement in specific surface area and porosity was obtained in comparison with pure FeOCl and MoS 2 . The adsorption experiment results showed that the adsorption capacity of MO dye at 25 °C could reach 1615.11 mg/g. In addition, the pseudo-second-order kinetic model (R 2 > 0.99) has a good applicability to describe the adsorption of MO onto FeOCl-MoS 2 . Langmuir isotherm model (R 2 > 0.99) can describe the adsorption process well, proving that the adsorption is surface-controlled monolayer adsorption. Thermodynamic analyses showed the adsorption is an exothermic process and has spontaneity in nature. The adsorption of MO onto FeOCl-MoS 2 is attributed to electrostatic interaction. In particular, the adsorption capacity could still reach 82.1% of the initial adsorption capacity by alkali washing after five cycles. Hence, this study reveals that FeOCl-MoS 2 could be a high-efficient adsorbent for dyes removal from wastewaters. Graphical abstract
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-11
·
IF 6.232
Zou Jiao,Lan Xi-Wen,Zhao Guo-Qing,Huang Zhao-Ning,Liu Yi-Ping,Yu Jin-Gang
A novel chiral sensing platform, 6-O-α-maltosyl-β-cyclodextrin (Mal-βCD)-based film, is proposed for selective electrochemical recognition of tyrosine ( Tyr ) enantiomers. Black phosphorus nanosheets (BP NSs) and Mal-βCD modified glassy carbon electrode (Mal-βCD/BP NSs/GCE) were prepared by a layer-to-layer drop-casting method, and the platform was easy to fabricate and facile to operate. It is proposed that the amino and hydroxyl groups of the Tyr enantiomers and the chiral hydroxyl groups of Mal-βCD selectively form intermolecular hydrogen bonds to dominate effective chiral recognition. Two linear equations of Ip (μA) = 11.40 C L-Tyr (mM) + 0.28 ( R 2 = 0.99147) and Ip (μA) = 7.96 C D-Tyr (mM) + 0.22 ( R 2 = 0.99583) in the concentration range 0.01–1.00 mM have been obtained. The limits of detection (S/N=3) for L- Tyr and D- Tyr were 4.81 and 6.89 µM, respectively. An interesting phenomenon was that the value of I L- Tyr /I D- Tyr (1.51) in this work was slightly higher than the value of I L- Trp /I D- Trp (1.49) reported in our previous study, where tryptophan ( Trp ) enantiomers were electrochemically recognized by Nafion (NF)-stabilized BPNSs-G2-β-CD composite. The two similar sensors fabricated by different methods showed different recognition ability toward either Tyr or Trp enantiomers, and the underlying mechanism was discussed in detail. More importantly, the proposed chiral sensor enables prediction of the percentages of D- Tyr in racemic Tyr mixtures. The chiral sensor may provide a novel approach for the fabrication of novel chiral platforms in the practical detection of L- or D- enantiomer in racemic Tyr mixtures. Graphical abstract
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PubMed
高影响因子
INFLAMMATION
·
2020
·Vol. 44
·期 2
·746-757
·
IF 3.212
Gao Yang,Kang Kai,Liu Yan-song,Li Na-na,Han Qiu-yuan,Liu Hai-tao,Kong Wei-lan,Zhang Xing,Huang Rui,Yang Zhen-yu,Qi Zhi-dong,Zheng Jun-bo,Li Ming,Wang Hong-liang,Li Jia-yu,Liu Rui-jin,Wang Si-cong,Zhang Wei-hua,Zhao Ming-yan,Yu Kai-jiang
This study aimed to investigate the effect of splenectomy on dexmedetomidine-activated cholinergic anti-inflammatory pathway-mediated alleviation of LPS-induced AKI. A mouse model of septic kidney injury was established in C57BL/6 mice. A total of 30 C57BL/6 mice were randomly divided into the control group, LPS group, dexmedetomidine + LPS group, splenectomy group, splenectomy + LPS group, and splenectomy + dexmedetomidine + LPS group. The pathological effects in kidney tissues in each group were analyzed by HE staining. Apoptosis in each group was examined by the TUNEL method. Cr and Cys-C levels in each group were measured by ELISA. The expression levels of IL-6, NF-κB p65, Caspase-3, the antiapoptotic protein Bcl-2, the proapoptotic protein Bax, and α7nAChR in each group were measured by qRT-PCR and Western blotting. Dexmedetomidine alone reduced apoptosis in kidney tissue; however, apoptosis was increased after splenectomy in mice treated with dexmedetomidine. Splenectomy reduced the production of proinflammatory cytokines in circulation and had a protective effect on the kidney. Splenectomy inhibited dexmedetomidine-mediated activation of the α7nAChR pathway. Dexmedetomidine effectively alleviated LPS-induced kidney injury, and splenectomy inhibited the anti-inflammatory, antiapoptotic, and renoprotective effects of dexmedetomidine. The kidney-spleen axis is mediated by the α7nAChR-NF-κB signaling pathway and is involved in the development of AKI.
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PubMed
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 6
·1571-1577
·
IF 2.161
Zhu Meng-Ya,He Ping,Yang Xue-Li,Hui Guang-Ze,Tang Cheng-Chun,Pan Guo-Feng,Bie Li-Jian
Abstract P-xylene (p-C 8 H 10 ) is extremely harmful and dangerous to human health due to high toxicity and strong carcinogenicity. Exploring sensitive material to effectively detect p-xylene is of importance. In this paper, perovskite single crystal (C 4 H 9 NH 3 ) 2 PbI 4 has been successfully synthesized via solution method. The obtained product was analyzed by single crystal X-ray diffraction. With the space group Pbca, orthorhombic (C 4 H 9 NH 3 ) 2 PbI 4 layered perovskite structure consists of an extended two-dimensional network of corner-sharing PbI 6 octahedron. Single layer perovskite sheets of distorted PbI 6 octahedron alternated with protonated n-butylammonium cation bilayers, which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Density functional theory (DFT) simulations regarding the adsorption energy revealed that this organic–inorganic hybrid perovskite compound has excellent selectivity toward p-xylene compared with other gases including C 2 H 5 OH, C 6 H 6 , CH 2 Cl 2 , HCHO, CH 3 COCH 3 and C 7 H 8 . The calculation of electron density, density of states and electron density difference showed the sensing mechanism of p-C 8 H 10 is mainly derived from physical adsorption–desorption in view of electron transfer. Graphic abstract For organic–inorganic hybrid perovskite (C 4 H 9 NH 3 ) 2 PbI 4 , single layer perovskite sheets of distorted PbI 6 octahedron alternated with protonated n-butylammonium cation bilayers (a), which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Electron density difference calculation shows that adsorption of p-xylene molecule has an obvious effect on the electron distribution of (C 4 H 9 NH 3 ) 2 PbI 4 , results in electrically polarization as a local manner (b).
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 6
·1810-1820
·
IF 2.482
Zhao Nannan,Wang Songbo,Cheng Penggao,Zhang Jianping,Zhang Lei,Du Wei,Tang Na
Co 3− x Mn x O 4 is a bimetal oxide with excellent electrochemical activity in alkaline solution, has been regarded as a promising alternative in the field of ion-air batteries and proton exchange membrane fuel cell (PEMFC). Herein, we report a simple solvothermal-calcination method to fabricate Co 3− x Mn x O 4 with tunable external Co 3+ /Co 2+ and Mn 3+ /Mn 2+ ratio. The tunable ratio of element valence in the bimetal results in a higher exposure of active center for oxygen redox reaction (ORR), and thus lead to a better ORR activity, which was confirmed by X-ray photoelectron spectroscopy characterizations and electrochemical measurements. Specially, Co 1.8 Mn 1.2 O 4 with a Co 3+ /Co 2+ ratio of 2.08 showed an overpotential of 0.37 V at benchmark ORR current density of 3 mA/cm 2 in 0.1 M KOH, which is lower than that of pure oxide (Mn 3 O 4 0.53 V and Co3O4 0.56 V). In addition, the as prepared Co 1.8 Mn 1.2 O 4 exhibited a positive half-wave potential (0.83 V vs RHE) due to their more active sites, promotes charge transfer, adsorption and desorption of oxygen species. This work provides a strategy for the design and fabrication of earth-abundant, low-cost electrocatalysts for PEMFC in practical applications. Graphic Abstract Co 3− x Mn x O 4 was fabricated by tuning external Co 3+ /Co 2+ and Mn 3+ /Mn 2+ ratio, and the activity initially shows a positive correlation with the ration of Co 3+ /Co 2+ in Co 3− x Mn x O 4 .
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高影响因子
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2020
·Vol. 27
·期 12
·1400-1406
·
IF 1.213
Chen Yong-feng,Lv Xue-ming,Pang Zheng-de,Lv Xue-wei
The effect of the Al 2 O 3 content and basicity (the molar ratio of MgO to SiO 2 ) on the viscosity of a SiO 2 –MgO–FeO–Al 2 O 3 –CaO slag was studied to fully understand the smelting process of the ferronickel alloy. Experimental results show that the slag is a mixture of liquid and solid phases at the experimental temperature. The viscosity decreased as the basicity increased and increased as the Al 2 O 3 content increased. To determine the effect of the Al 2 O 3 content and basicity on the structure of the molten slag, Raman spectroscopy was performed on the slag sample, which was quenched from the high temperature with water. The Raman spectra showed that the fractions of the polymerization structural units decreased significantly as the basicity of the slag increased, resulting in a decrease in the apparent viscosity. However, Al 2 O 3 acts as a network former in the slag system, thereby making the slag structure further polymerized and increasing the viscosity.
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高影响因子
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