ACS Applied Energy Materials
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2020
·
IF 4.473
Ming Chen,TrungHieu Le,Yuanxiang Zhou,Feiyu Kang,Ying Yang
Developing advanced carbon nanomaterials with reasonable pore distribution and interconnection and matching the charge-storage capacities and electrode kinetics between the capacitive electrode and the battery-type electrode are two of the biggest challenges in lithium-ion capacitors (LICs). In this work, a sustainable strategy to fabricate N/S dual-doped hierarchical porous carbon nanofibers (N/S-CNF) is developed via electrospinning and thiourea treatment, and the N/S-CNF is employed as both the capacitor-type cathode and the battery-type anode for LICs. With rational design, N/S-CNF can not only offer a large specific surface area with a hierarchical pore structure but also be uniformly doped with heteroatoms, which is desirable for improving the electrochemical performance of both the cathode and the anode for LICs and alleviating the mismatch between the two electrodes. LICs assembled with the designed N/S-CNF electrodes can deliver a high energy density of 154 Wh kg–1 with a stable capacitance retention of 92% after 6000 cycles. Our work is expected to open up new avenues for developing heteroatom-doped porous carbon nanomaterials applied in other energy conversion and storage devices.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
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IF 2.627
Xiujuan Li,Le Chen,Dandan Zhu,Song Yang,Zhong Wu,Mingyang He,Zhihui Zhang,Qun Chen
A novel ZIF-8-CMC hybrid material was fabricated from the hybridization of ZIF-8 and carboxymethylcellulose (CMC) by impregnation method for n -hexane/3-methylpentane separation. The surface properties of ZIF-8 were tailored by introducing CMC into ZIF-8 nanoparticles . In this work, adsorption separation of n -hexane ( n HEX) and 3-methylpentane (3MP) on ZIF-8-CMC were investigated by batch vapor-phase adsorption and liquid-phase breakthrough adsorption. The adsorption selectivity of n HEX/3MP reversed from preferable adsorption of n HEX to preferable adsorption of 3MP upon the increasing of CMC containing in the hybrid materials. As the temperature increases, the adsorption amounts of n HEX and 3MP decrease. With the increasing of CMC contents, the n HEX uptake decreased, the uptake capacity of 3MP increased gradually. For liquid-phase breakthrough adsorption, the dynamic adsorption capacity of n HEX also decreased with the increasing of temperature.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Yuan Li,Yuyang Wei,Wenbin Zhang
The effect of proton acceptor on the electrochemistry of proton-coupled electron transfer reagents is always worthy of attention. Formal potentials of NHPI with different proton acceptors have been measured by cyclic voltammetry and were used to discriminate hydrogen bonding and deprotonation engaging in the oxidation of NHPI. With the negative shifting of formal potentials, the formation of hydrogen bonding complex was suggested when adding water into NHPI acetonitrile solution, a new wave caused by the addition of one pyridine base may be caused by a deprotonation process followed by a single electron transfer step. In addition, electrooxidation reactions of benzyl alcohol mediated by hydrogen bonding or deprotonation modified NHPI have been addressed and significant findings have been reported.
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Journal of Energy Chemistry
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2020
·
IF 7.216
Chengzhi Zhang,Donghai Wei,Fei Wang,Guanhua Zhang,Junfei Duan,Fei Han,Huigao Duan,Jinshui Liu
Nanostructured iron sulfides are regarded as a potential anode material for sodium-ion batteries in virtue of the rich natural abundance and remarkable theoretical capacity. However, poor rate performance and inferior cycling stability caused by sluggish kinetics and volume swelling represent two main obstacles at present. The previous research mainly focuses on nanostructure design and/or hybridizing with conductive materials. Further boosting the property by adjusting Fe/S atomic ratio in iron sulfides is rarely reported. In this work, Fe 7 S 8 and FeS 2 encapsulated in N-doped hollow carbon fibers (NHCFs/Fe 7 S 8 and NHCFs/FeS 2 ) are constructed by a combined chemical bath deposition and subsequent sulfidation treatment. The well-designed NHCFs/Fe 7 S 8 electrode displays a remarkable capacity of 517 mAh g −1 at 2 A g −1 after 1000 cycles and a superb rate capability with a capability of 444 mAh g −1 even at 20 A g −1 in ether-based electrolyte. Additionally, the rate capability of NHCFs/Fe 7 S 8 is superior to that of the contrast NHCFs/FeS 2 electrode and also much better than the values of the most previously reported iron sulfide-based anodes. The in-depth mechanism explanation is explained by further experimental analysis and theoretical calculation, revealing Fe 7 S 8 displays improved intrinsic electronic conductivity and faster Na + diffusion coefficient as well as higher reaction reversibility.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Sha Liu,Xiaoteng Jiang,Zhi Shang,Yin Ji,Huiyu Wang,Zeyuan Wang,Peng Wang,Yan Zhang,Hua Xiao
Glycoproteins are important biomarkers for cancers, while most glycoproteomics biomarkers suffering from low sensitivity and specificity due to their uncharacterized glycan structures. AZGP1 is a potential biomarker for salivary diagnostics of lung cancer, which is used as a model glycoprotein in this study for method development. We initially analyzed salivary N-glycoproteome by using lectin affinity chromatography and more than 300 N-glycoproteins were identified, including AZGP1. 7 gel spots of AZGP1 were resolved by two-dimensional gel electrophoresis and further confirmed by two-dimensional western blot as well as mass spectrometry. The isomeric glycan structures of AZGP1 in these spots were systematically characterized both at composition level and at structure level. Our results revealed 10 glycan compositions for salivary AZGP1, including core fucosylated glycans on Asn128 and sialylated glycans on Asn109 and Asn112. We further compared the glycan structures of salivary AZGP1 from lung cancer group and control group. Accordingly, 14 and 7 potential glycan structures were successfully revealed, respectively. In total, 15 glycan compositions and 22 potential glycan structures were identified and characterized for AZGP1, including some different structures with the same compositions. In particular, 5 potential glycan structures were identified as lung cancer unique signatures. Our developed strategy holds promise for thorough identification of glycan structures on a target glycoprotein biomarker. In-depth characterization of its glycan structures will ultimately enhance its sensitivity and specificity for cancer detection.
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ACS Applied Nano Materials
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2020
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IF 0
Chao Wang,Xiaodan Wang,Fengyu Lai,Zheng Liu,Ruohao Dong,Wen Li,Hongxia Sun,Baoyou Geng
Metal–organic framework (MOF)-derived materials have attracted increasing attention in the field of energy storage and conversion. Calcining MOFs to carbonized structures is a common route to obtain MOF-derived materials. However, the existing calcination conditions often cause the structural collapse and the specific surface area to be significantly reduced. In this work, we use argon–hydrogen mixed gas for calcination of MOFs to obtain a N-doped porous carbon material with excellent properties. Its BET specific surface area and pore volume up to 2476 m2 g–1 and 1.325 cm3 g–1, respectively, which are higher than those of the precursor ZIF-8 (1960 m2 g–1 and 0.687 cm3 g–1), perfectly inherited the rhombic dodecahedron morphology of the precursor. Hydrogen reduces the zinc in ZIF-8 at high temperature to evaporate, which avoids the carbothermal reduction reaction between the zinc component and the carbon framework of MOFs, protecting the framework of MOFs and leaving a lot of micropores, so that after the carbonization of MOFs it still has extremely high specific surface area and pore volume, even surpassing the MOFs precursors. We loaded Pt nanoparticles on the prepared porous carbon to catalyze the oxygen reduction reaction and showed an excellent half-wave potential of 0.883 V, which is 10 mV higher than that of the commercial Pt/C (Pt 20 wt %), while the Pt loading is only 8.66 wt %. The stability is also much better than Pt/C.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Li Wang,Lili Cui,Xin Ge,Nailin Yue,Xingquan He,Wei Zhang,Tewodros Asefa
Developing efficient nonprecious electrocatalysts that can drive the oxygen electrode reactions in zinc-air batteries (ZABs) is important but remains challenging. In this work, novel materials comprising Mn/Cu nanoclusters-grafted N-doped carbon nanotubes are synthesized by preparing and then pyrolyzing Mn/Cu polyphthalocyanine-encapsulated carbon nanotubes (CNTs), followed by treating the products with acidic solution. The materials are named CNTs@(Mn,Cu)PPc-T, where T denotes the pyrolysis temperature in °C, and they are demonstrated to serve as efficient oxygen electrode catalysts for zinc-air batteries (ZABs). Among them, the one synthesized at 900 °C, CNTs@(Mn,Cu)PPc-900, requires more positive onset and half-wave potentials for reduction of oxygen and a low overpotential for the evolution of oxygen. A rechargeable ZAB assembled with CNTs@(Mn,Cu)PPc-900 electrocatalyst delivers a high power density (158.5 mW cm −2 ) and displays an excellent stability in 200 cycles of charge/discharge (in over 33 h). Such performance is even superior to that of a ZAB containing the benchmark Pt/C + RuO 2 catalyst as an air cathode under identical testing condition.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Junwei Cui,Shengshan Bi,Andreas P. Fröba,Jiangtao Wu
The present work focus on the measurement of viscosity and interfacial tension of n -heptane ( n -C 7 H 16 ) with dissolved carbon dioxide (CO 2 ) by the surface light scattering. The method allows an absolute determination of both properties in a contactless way. The experiments were conducted in macroscopic thermodynamic equilibrium at temperatures from (298 to 473) K and saturation pressures up to 5.5 MPa. For sample preparation of binary mixtures of n -C 7 H 16 with dissolved CO 2 after its addition, the equilibration process could be checked to be completed by showing that viscosity and interfacial tension are independent on time. For reaching equilibrium, at least two hours were elapsed between the addition of CO 2 and the start of the measurement. For both viscosity and interfacial tension, typical expanded uncertainties are 3% on a confidence level of 95%. The viscosity results were correlated with an empirical equation, where the absolute average deviation (AAD) and the maximum absolute deviation (MAD) between experiments and correlation were 1.9% and 7.2%, respectively. For the viscosity, a data comparison was hindered because of the lack of literature data. For the interfacial tension, which can also be represented by an empirical correlation and good agreement with literature can be found.
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CELLULOSE
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2020
·Vol. 27
·期 15
·9075-9089
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IF 4.21
Chen Yu,Wang Dingfei,Liu Shidong,Lu Yonghua,Zhang Guangxian,Zhang Fengxiu
Abstract A novel P–N based, flame retardant ammonium salt of pentaethylenehexamine octa (methylene-phosphoric acid) (APHOMPA) was synthesized in this study. The structure of the prepared material flame retardant contains eight reactive ammonium phosphorus groups and was characterized by 1 H NMR, 13 C NMR, 31 P NMR, and (Fourier-transform infrared) FT-IR. The results showed that cotton fabrics finished with this flame retardant exhibited excellent flame retardancy and durability. The cotton fabrics finished with 30% APHOMPA solution had limiting oxygen index value 40.5%, and maintained 28.8% even after 50 laundering cycles. The FT-IR results showed that APHOMPA could be grafted on cellulose through P–O–C covalent bond. Vertical flammability, cone calorimetry, thermogravimetric (TG), and TG-IR results revealed the excellent flame retardancy of the finished cotton fabrics and suggested that the flame retardant mechanism of APHOMPA is a condensed phase process. Scanning electron microscopy results suggested the flame retardant entered the inner space of the cotton fabrics, and the X-ray diffraction results showed slight changes to the cotton crystal structure in the finishing process. The breaking strength, softness, and whiteness of finished cotton fabrics were sufficient, suggesting this retardant can be used to prepare treated cotton for multiple applications. Graphic abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Haoqing Lin,Jiao Xie,Zhenbao Zhang,Shaofeng Wang,Dengjie Chen
We applied a novel solid-liquid co-electrospinning approach to synthesize hybrid LaCoO 3 perovskite nanoparticles@nitrogen-doped carbon nanofibers (LCNP@NCNF) as an effective and robust electrocatalyst for Zn-air batteries. LCNP@NCNF featured an integrated structure with well-crystallized perovskite nanoparticles uniformly distributed in micro/mesoporous NCNF. In addition, LCNP@NCNF exhibited a high specific surface area of ~183.3 m 2 g −1 and a large pore volume of ~0.164 m 3 g −1 . The rotating-electrode measurement revealed the better intrinsic activity and more favorable stability of LCNP@NCNF in comparison with their counterparts. Moreover, Zn-air batteries employing LCNP@NCNF showed a relatively smaller discharge-charge voltage gap of ~0.95 V and longer cycling stability than the battery adopting the physically blended LCNP and NCNF. We ascribed the improved electrochemical activity to the enhanced synergistic interaction originating from the successful coupling of LCNP and NCNF.
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APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Xiaohong Wang,Xin Li,Chengxiang Huang,Chen Hao,Cunwang Ge,Yaning Guo
Herein, the NiCo 2 Al-LDH/N-GO electrode was first and successfully synthesized by a simple and environmental-friendly method. The NiCo 2 Al-LDH/N-GO electrode has a high specific capacitance of 1136.67F g −1 at a current density of 1 A g −1 , and the specific capacitance retention rate maintained 90.10% after 5000 cycles at a current density of 10 A g −1 . The prepared NiCo 2 Al-LDH/N-GO electrode has excellent electrochemical performance and cycle performance. In addition, the ASC device was assembled using NiCo 2 Al-LDH/N-GO as the positive electrode and activated carbon as the negative electrode with KOH/PVA as gel electrolyte. The NiCo 2 Al-LDH/N-GO//AC asymmetric capacitor exhibits a high energy density of 42.25 Wh kg −1 at a power density of 800 W kg −1 and 11.39 Wh kg −1 at a power density of 8 kW kg −1 . Thus, NiCo 2 Al-LDH/N-GO electrode shows the potential application in energy storage device.
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FOOD AND CHEMICAL TOXICOLOGY
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2020
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IF 4.679
Zengqiang Li,Yige Yu,Yang Li,Feifei Ma,Yinghui Fang,Chaobo Ni,Keyang Wu,Peipei Pan,Ren-Shan Ge
Di-n-butyl phthalate (DBP) is widely used in consumer products as a plasticizer . Here, we report a natural product taxifolin that can attenuate developmental and reproductive toxicity of DBP. Pregnant rats were daily gavaged with 500 mg/kg DBP alone or together with taxifolin (10 and 20 mg/kg) from gestational day (GD) 12–21. At GD21, sera and testes of male fetus were collected. DBP significantly lowered serum testosterone level at 500 mg/kg and taxifolin can completely reverse its action. DBP caused abnormal aggregation of fetal Leydig cells and taxifolin can reverse it. DBP down-regulated the expression of the genes of cholesterol side-chain cleavage enzyme ( Cyp11a1 ), 17β-hydroxysteroid dehydrogenase 3 ( Hsd17b3 ), and insulin-like 3 ( Insl3 ) and taxifolin can reverse its action. DBP increased malondialdehyde levels and decreased superoxide dismutase and glutathione peroxidase expression and taxifolin can reverse it. DBP increased incidence of multinucleated gonocytes and taxifolin can prevent it. Moreover, DBP lowered sirtuin 1 (SIRT1)/peroxisome proliferator-activated receptor γ coactivator 1-α (PGC-1α) and phosphorylated AMP-activated protein kinase (pAMPK) signalling and taxifolin antagonized DBP. In conclusion, in utero exposure to DBP caused developmental/reproductive toxicity of male offspring via increasing reactive oxygen species and taxifolin is an effective food component that completely reverses DBP-mediated action.
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