ELECTROCHIMICA ACTA
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2020
·
IF 6.215
You Zhou,Zhengyong Huang,Jian Li,Huijun Liao,Hanxiang Wang,Yu Wang,Guanglei Wu
A compound electrode of carbonaceous materials and NiCo 2 O 4 is extensively studied because of higher capacitance and better rate capability compared to those of pure NiCo 2 O 4 . However, the tedious preparation process, harsh synthesis condition, high consumption, and especially limited electrochemical property by using modifiers hinder its practical application. Herein, modifier-free electrodes (C/NiCo 2 O 4 ) with various morphologies based on D-ribose are successfully synthesized via a one-step hydrothermal-calcination method. D-ribose concurrently acts as carbon source and structure-directing agent. The structure of NiCo 2 O 4 changes from the nanosheets into nanowires after adding D-ribose. Each element is evenly distributed throughout C/NiCo 2 O 4 , significantly improving the electrical conductivity. Furthermore, there is a strong interaction between carbon and NiCo 2 O 4 , which keeps the structure stable. Benefiting from the structural characteristics, the C/NiCo 2 O 4 composites display the improved electrochemical performance. Remarkably, the maximum specific capacitance of C/NiCo 2 O 4 -2 is 1583.9 F g −1 at 2 A g −1 in 3 M KOH aqueous solution, and it exhibits remarkable rate capability of 1354.8 F g −1 even at 20 A g −1 . After 20,000 charge-discharge cycles at 20 A g −1 , a high capacity retention of 90.6% can be achieved. The C/NiCo 2 O 4 -2 is a promising electrode material for supercapacitor. In addition, a dynamic growth mechanism of C/NiCo 2 O 4 under the coordinate bond of metal ions with D-ribose is discussed in the paper.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2020
·
IF 4.006
Mingyu Ji,Jiulin Wu,Xinyu Sun,Xiaoban Guo,Wenjin Zhu,Qingxiang Li,Xiaodan Shi,Yongqi Tian,Shaoyun Wang
In this paper, the natural antibacterial agent cinnamaldehyde (CA) was made into nanoemulsions to improve its water solubility. Subsequently, the active gelatin (GL-CA-Vc) films with antibacterial and antioxidant activities were prepared by combining silver carp skin gelatin with CA nanoemulsions and vitamin C (Vc). Compared with the gelatin control (GL-Control) film, the thickness, roughness and water vapor permeability (WVP) of active films increased significantly. In addition, the elongation at break (EAB) and light barrier property of active films were also enhanced. The antibacterial and antioxidant activities of active films were related to the content of active additives. The film containing 100 mg of CA and 50 mg of Vc (GL-100CA-50Vc) had good light barrier property and a high EAB (158.00 ± 12.51%). What's more, the inhibition rate of GL-100CA-50Vc film against Pseudomonas aeruginosa was 55.97 ± 4.25%, and the free radical scavenging rate of the film to ABTS and DPPH was 96.26 ± 0.72% and 95.74 ± 0.20% respectively, which indicated that the film had good antibacterial and antioxidant activities.
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Aging-US
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2020
·
IF 4.831
Xin Yang,Mohan Zhang,Yuhua Dai,Yuchao Sun,Yahyah Aman,Yuying Xu,Peilin Yu,Yifan Zheng,Jun Yang,Xinqiang Zhu
Aging is the primary driver of various diseases, including common neurodegenerative diseases such as Alzheimer’s disease (AD) and Parkinson’s disease (PD). Currently there is no cure for AD and PD, and the development of novel drug candidates is demanding. Spermidine is a small anti-aging molecule with elimination of damaged mitochondria via the process of mitophagy identified as a molecular mechanism of action. Here, we show that spermidine inhibits memory loss in AD worms and improves behavioral performance, e.g., locomotor capacity, in a PD worm model, both via the PINK1-PDR1-dependent mitophagy pathway. Additionally, spermidine delays accelerated aging and improves healthspan in the DNA repair-deficient premature aging Werner syndrome (WS) worm model. While possible intertwined interactions between mitophagy/autophagy induction and DNA repair by spermidine are to be determined, our data support further translation of spermidine as a possible therapeutic intervention for such diseases.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xiaoshan Zhang,Bing Wang,Nan Wu,Cheng Han,Yingde Wang
Ceramic fibers are one of the most important high-temperature thermal insulating materials for application in the harsh environment. However, the practical use of traditional ceramic fibers has been largely impeded by their poor thermal stability or high thermal conductivity at high-temperatures. Here, multi-phase SiZrOC (SiO x C y , SiO 2 , ZrO 2 , ZrSiO 4 and C) nanofiber (NF) was rationally designed and prepared according to the intrinsic factors of these phases with lower heat transfer effects (significant phonon scattering and infrared shielding) that contributes to the high-temperature thermal insulation performance in ceramic fibers. Owing to the unique multi-phase microstructure, the obtained SiZrOC NFs exhibit ultralow thermal conductivity (~0.043 W m −1 K −1 at 25 °C and ~0. 233 W m −1 K −1 at 1400 °C), high flexibility, good mechanical strength, excellent fire resistance and thermal stability even up to 1400 °C, which makes it an ideal high-temperature thermal insulator especially for applications under extreme conditions. This work not only presents with the fabrication of a prosperous material for high-temperature thermal insulation but also offers a novel strategy for developing a wider range of high-temperature thermal insulating materials.
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ChemElectroChem
·
2020
·Vol. 7
·期 24
·4999-5004
·
IF 4.154
Li Deng,Zhan-Yu Wu,Jin-Hai You,Zu-Wei Yin,Wen-Feng Ren,Peng-Fang Zhang,Bin-Bin Xu,Yao Zhou,Jun-Tao Li
Graphical Supportive network : A carbon continuous network acts as conductive and binding components of the electrode providing enhanced electrode conductivity while maintaining the integrity of the electrode structure during charge and discharge processes. Moreover, the porous and fluffy conductive network provides a buffer space for the volume expansion of silicon and boosts the stable cycle performance of the silicon anode. A porous and fluffy Si@C-network electrode, in which the Si nanoparticles contact with the carbon conductive network, is prepared by an in-situ carbonization method on a copper collector. Si nanoparticles are uniformly embedded in the 3-dimensional fluffy carbon network, which could suppress the capacity decay resulting from the Si volume expansion during the cycling process. The Si@C-network electrode with a high ratio (83.4 wt %) of active Si exhibits long-term cycling stability (capacity retention of 765 mAh g −1 after 700 cycles at 2100 mA g −1 ) and good rate performance. The superior electrochemical performance is attributed to the continuous conductive network, which improves the conductivity of electrode and maintains the electrode structure well after 100 cycles.
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RSC Advances
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2020
·Vol. 10
·期 66
·39981-39987
·
IF 3.119
Ju-Gong Zheng,Guang-Yuan Ren,Jun Shi,Ting Yang,Yue-Feng Tang,Yan-Feng Chen
In this study, a facile yet efficient interfacial hydrothermal process was successfully developed to fabricate LiMnPO4/C composites. In this strategy, the walls of carbon nanotubes were employed as heterogeneous nucleation interfaces and biomass of phytic acid (PA) as an eco-friendly phosphorus source. By comparing the experimental results, a reasonable nucleation-growth mechanism was proposed, suggesting the advantages of interfacial effects. Meanwhile, the as-synthesized LiMnPO4/C samples exhibited superior rate performances with discharge capacities reaching 161 mA h g−1 at C/20, 134 mA h g−1 at 1C, and 100 mA h g−1 at 5C. The composites also displayed excellent cycling stabilities by maintaining 95% of the initial capacity over 100 continuous cycles at 1C. Electrochemical impedance spectroscopy showed that the superior electrochemical performances were attributed to the low charge-transfer resistance and elevated diffusion coefficient of lithium ions. In sum, the proposed approach for the preparation of LiMnPO4/C composites looks promising for future production of composite electrode materials for high-performance lithium-ion batteries.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Nan Wang,Wangqiang Li,Yadong Ren,Jizhou Duan,Xiaofan Zhai,Fang Guan,Lifei Wang,Baorong Hou
Developing environmental and cost-effective antifouling technologies is essential to solve serious biofouling problems. Recently, enzyme mimics and halogenating enzymes have caught progressively attention as valuable tools to combat biofilm formation. In this work, the core-shell structure of CeO 2 @C, as one effective haloperoxidase-like enzyme mimics, was successfully synthesized using the carbon sphere as template through a simple coprecipitation method. Through the UV–vis absorption spectra and kinetic measurements, the CeO 2 @C displays intrinsic haloperoxidase-like activity via catalyzing the bromination of organic signaling compounds. Meanwhile, the prepared CeO 2 @C catalyst process high catalytic stability and recyclability, corresponding to a well catalytic performance repeatability after refresh of raw substrates (at least 10 times). The antibactrial property of CeO 2 @C as haloperoxidase mimicry is evaluated by immersing titanium plate/CeO 2 @C modified titanium plates into bacterial suspensions with different conditions for 4 h at 37 °C. It can catalyze the oxidation of Br − with H 2 O 2 to the corresponding hypobromous acid (HBrO), which exhibits strong antibacterial activity against Gram-negative ( Escherichia coli ), Gram-positive ( Staphylococcus aureus ) bacteria and typical marine ( Pseudomonas aeruginosa ) bacteria. This study introduces a stable, non-poisonous and inexpensive biomimetic material for antibacterial, antifouling and disinfection applications based on novel sustainable and conservation methods.
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ACS Omega
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2020
·
IF 2.87
Yan Xu,Xiangmei Jin,Jun Zhang,Kun Wang,Xiaoyan Jin,Dongyuan Xu,Xizhe Tian,Lan Liu
In this study, we designed, formulated, and investigated the potential antitumor activity of a folate receptor (FR)-mediated double-targeted drug delivery system. The system comprised of the FR ligand folic acid (FA), glycine-phenylalanine-leucine-glycine (Gly-Phe-Leu-Gly, GFLG), which can be specifically cleaved by cathepsin B, and the anticancer drug mitomycin C (MMC). The antitumor effect of FA-GFLG-MMC was compared to that of MMC. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay revealed that FA-GFLG-MMC has a significantly higher inhibitory effect on HeLa, SiHa, and PC9 cells (high FR expression) than that on 16HBE and A549 cells (low FR expression). Furthermore, FA-GFLG-MMC inhibited cancer cell proliferation in a dose-dependent manner. Free MMC was toxic to both cancer and normal cells. Apoptosis of the HeLa, SiHa, and PC9 cells was higher than that of the A549 cells; however, the apoptotic effect on 16HBE cells was minimal. Proapoptotic protein bcl-2-associated X-protein (BAX) and antiapoptotic protein BCL-2 play critical roles in cellular defense and apoptotic signal transduction. BAX/BCL-2 ratio is used to determine the intensity of an apoptotic signal and assess whether a cell will survive or undergo apoptosis. BAX and BCL-2 expression in cells treated with 5 μM FA-GFLG-MMC was studied by Western blotting. FA-GFLG-MMC increased the BAX/BCL-2 ratio in HeLa, SiHa, and PC9 cells. The results show that FA-GFLG-MMC can effectively inhibit tumor cell proliferation by inducing apoptosis. Therefore, the system developed can enhance the delivery of anticancer drugs to cancer cells and thereby reduce their toxic effects on normal cells.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Na Zhao,Yang Hu,Jinlong Du,Gang Liu,Bowei Dong,Yuying Yang,Jing Peng,Jiuqiang Li,Maolin Zhai
Developing non-noble-metal cocatalysts is essential for the large-scale implementation of solar-driven H 2 production technology, but still remains a great challenge. In this work, Ti 3 C 2 T x MXene coupled CdS nanostructures are fabricated via one-step gamma-ray radiation-induced reduction in ambient conditions. By subsequent alkaline treatment, a novel cocatalyst of carbon supported amorphous TiO 2 nanosheets (denoted as aTiO 2 -C) is derived from Ti 3 C 2 T x /CdS to form aTiO 2 -C/CdS nanocomposites. The prepared aTiO 2 -C/CdS nanocomposites with cyclability achieve a H 2 evolution rate of 1.48 mmol·g −1 ·h −1 under visible-light illumination, which is 6.4 and 7.0 times greater than that of pristine Ti 3 C 2 T x /CdS and P-CdS, respectively. The oxygen vacancies in aTiO 2 -C cocatalysts are revealed to act as electron trapping sites to facilitate the transfer of photoexcited electrons and boost photoactivity. Further, the electronic interaction between CdS and aTiO 2 -C prevents Cd 2+ from leaching and thus enhances photostability. The results of this work may guide the rational design of viable cost-effective cocatalysts in solar-to-chemical energy conversion and beyond.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 12
·4099-4108
·
IF 5.721
Ting Qu,Qiang Tan,Liting Liu,Shengwu Guo,Sai Li,Yongning Liu
The wide application of direct ethanol fuel cells (DEFCs) was blocked by the sluggish catalytic activity of catalysts, insufficient ionic conductivity of the polymer electrolyte membrane (PEM), and ethanol crossover issues. To overcome the problems mentioned above, a novel DEFC system with a polymer fiber membrane (PFM) and nonplatinum catalysts is proposed. In this system, the performance of the anode catalyst Pd/C is significantly promoted by homogeneous Ni-doped SnO2 nanoparticles, and the inexpensive permeable PFM is used as a substitute for the PEM. Due to the remarkable catalytic activity and the optimized resistance, the PFM-based DEFC exhibits encouraging performance, which can afford a peak power density of 47.4 mW cm−2 with a porous NiCo2O4 cathode catalyst. Moreover, it can operate continuously for 100 h with only 4.56% drop in electrical output. Therefore, this study provides a very effective strategy for optimizing DEFCs with low cost and high performance.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Xueyu Tong,Govindarajan Prasanna,Nan Zhang,Pu Jing
The binding of C-phycocyanin (CPC), a light harvesting pigment with phycocyanobilin (PCB), a chromophore is instrumental for the coloration and bioactivity. In this study, structure-mediated color changes of CPC from Spirulina platensis during various enzymatic hydrolysis was investigated based on UV–visible, circular dichroism, infra-red, fluorescence, mass spectrometry, and molecular docking. CPC was hydrolyzed using 7.09 U/mg protein of each enzyme at their optimal hydrolytic conditions for 3 h as follows: papain (pH 6.6, 60 °C), dispase (pH 6.6, 50 °C), and trypsin (pH 7.8, 37 °C). The degree of hydrolysis was in the order of papain (28.4%) > dispase (20.8%) > trypsin (7.3%). The sequence of color degradation rate and total color difference (Δ E ) are dispase (82.9% and 40.37), papain (72.4% and 24.70), and trypsin (58.7% and 25.43). The hydrolyzed peptides were of diverse sequence length ranging from 8 to 9 residues (papain), 7–12 residues (dispase), and 9–63 residues (trypsin). Molecular docking studies showed that key amino acid residues in the peptides interacting with chromophore. Amino acid residues such as Arg86, Asp87, Tyr97, Asp152, Phe164, Ala167, and Val171 are crucial in hydrogen bonding interaction. These results indicate that the color properties of CPC might associate with chromopeptide sequences and their non-covalent interactions.
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APPLIED COMPOSITE MATERIALS
·
2020
·Vol. 27
·期 3
·131-148
·
IF 2.199
Cuiyan Li,Zhao Xu,Haibo Ouyang,Liyuan Chang,Jianfeng Huang,Yijun Liu
Porous C/SiC ceramics were prepared by chemical vapor reaction of SiO and porous C/C composites. The porous C/SiC ceramics presented a hierarchical structured consisted of carbon fibers, SiC layer, microspheres and nanowires. The density of porous C/C composites control the growth of SiC nanowires and nanolayer, and influence the pore size distribution and specific surface area of the porous C/SiC ceramics. The C/SiC samples converting from the C/C composites with a density of 0.46 g/cm 3 possess the superior adsorption properties. The adsorption efficiency can reach 98.2% within 80 min, indicating that C/SiC samples have a promising adsorption property for MB from aqueous solution. Furthermore, the adsorption efficiency after five cycles microwave regeneration still reached 80.2%, which present excellent regeneration stability.
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