CRYSTENGCOMM
·
2021
·Vol. 23
·期 8
·1777-1784
·
IF 3.545
Xiaowei Shi,Ping Yang,Yongyong Cao,Chao Dai,Weiqing Ye,Lingxia Zheng,Zhefei Zhao,Jianguo Wang,Huajun Zheng
Designing non-noble-metal electrocatalysts with high catalytic activity and stability towards hydrogen evolution reaction is vitally necessary for the demands of renewable and clean energy sources. Herein, an advanced water reduction electrocatalyst with a two-dimensional (2D) morphology based on CoP embedded on the surface of nanocarbon (CoP@C) is fabricated, which is derived from 2D Co-MOF by low-temperature phosphorization. Benefiting from the unique 2D morphology as well as more exposed (211) facet, such electrocatalyst exhibits superior catalytic activity in both alkaline and acid media in comparison to the traditional three-dimensional (3D) structure CoP@C with the overpotentials of 127 and 236 mV for HER at the current density of 10 mA cm−2, respectively. Density functional theory simulations unveil that the binding energies of the adsorbed intermediate species become more appropriate on the (211) facet compared with that on the (011) facet. This could improve the dissociation of H2O and desorption of H*, and thus facilitate the electrocatalytic activity. Moreover, the 2D electrocatalyst demonstrates enhanced electrocatalytic oxygen evolution reaction performance compared with its 3D counterparts. When the 2D CoP@C is employed as both the anode and cathode, a potential of 1.67 V is required to achieve the 10 mA cm−2 current density. In addition, it still exhibits good durability and even continued to work for 50 h.
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CHEMICAL ENGINEERING JOURNAL
·
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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Aging-US
·
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
Advanced Energy Materials
·
2020
·Vol. 10
·期 12
·1902913
·
IF 25.245
Kangkang Guo,Baojuan Xi,Ruchao Wei,Haibo Li,Jinkui Feng,Shenglin Xiong
Transition-metal phosphides (TMPs)-based electrode materials with high capacity have attracted considerable interest as a promising anode material for lithium−ion batteries (LIBs). Herein, a hierarchical cable-like structure composed of CoP@C core−shell nanoparticles (NPs) encapsulated in one-dimensional (1D) porous carbon framework intertwined with N-doped carbon nanotubes (CoP@C⊂PCF/NCNTs) is synthesized by a self-templating, self-catalytic, and subsequent vapor-phase phosphorization strategy. The unique nanoarchitecture regime provides multiple advantages. The 1D carbon framework allows for quick ion and electron access, maintaining the integrity and accommodating the volume change of the structure during repeated discharging/charging. The internal carbon shell can prevent the direct aggregation of CoP NPs on cycling. The external NCNTs on the surface supply a staggered conductive network to promote electrolyte penetration and charge transportation. Impressively, the as-fabricated hybrid nanocables deliver a reversible capacity of 712 mAh g −1 at 0.5 A g −1 for over 700 cycles with excellent rate capability as an anode material for LIBs. The significantly improved lithium storage properties of CoP@C⊂PCF/NCNTs reveal the importance of reasonable design and engineering of novel hierarchical structures with higher complexity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Wanwei Jiang,Xijun Xu,Yuxuan Liu,Liang Tan,Fengchen Zhou,Zhiwei Xu,Renzong Hu
Aqueous zinc-ion batteries have emerged as prospective energy storage devices to partly replace organic ion batteries due to their high safety and eco-friendliness. Providing multifold synthesis methods of cathode materials is essential for Zn-ion battery development. Here, we demonstrated a practical strategy for the large-scale fabrication of high performance β-MnO 2 @C hybrid cathode materials by plasma assisted milling (P-milling). After P-milling for 10 h, the porous hybrid microparticles consisted of MnO 2 nanocrystallites , which combined and wrapped with the thin carbon layer derived from expanded graphite. The pores among the β-MnO 2 @C particles facilitated electrolyte infiltration during continuous cycling, while combining with carbon greatly enhanced the conductivity of the hybrids and helped to alleviate MnO 2 dissolution. Therefore, the β-MnO 2 @C hybrids delivered excellent cycle stability, with a high capacity of 130 mAh g −1 for 400 cycles at a current rate of 300 mA g −1 in an aqueous Zn(CF 3 SO 3 ) 2 electrolyte. This capacity retention was amongst the highest reported so far for MnO 2 -based cathode materials for Zn-ion batteries.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 2
·224-230
·
IF 2.69
Si Zhihao,Zhang Xin,Zuo Miao,Wang Tao,Sun Yong,Tang Xing,Zeng Xianhai,Lin Lu
2, 5-furandicarboxylic acid (FDCA) is a one of the most promising biomass-derived chemicals to substitute the non-renewable terephthalic acid as the monomer for producing polyethyleneterephthalate. At present, the oxidation of HMF is regarded as a prevalent way to prepare FDCA. Nevertheless, the isolation and storage of HMF is still a challenge. Herein, based on the higher stability of 5-formyloxymethylfurfural (FMF) than 5-hydroxymethylfurfural (HMF), we present an effective preparation route to prepare FDCA by substituting HMF with FMF as feedstock. A complete conversion of FMF and a 93.55% selectivity of FDCA were obtained in the mixed solvent of water and 1, 2-dioxane using Ru/C as catalyst and O 2 as oxidant. An improved process was developed for preparing FDCA using FMF as feedstock. The investigation of conversion pathway showed that FMF and HMF were simultaneously oxidized to 2, 5-diformylfuran (DFF) in a case of the existence of the reversible equilibrium between FMF and HMF. Then DFF was oxidized to 5-formyl-2-furancarboxylic acid (FFCA). Subsequently, FFCA was oxidized to FDCA. In this process, the oxidation of FFCA to FDCA was determined as the rate-determining step. Furthermore, appropriate alkalinity favored the selectivity of FDCA and the conversion of FMF.
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ELECTROCHIMICA ACTA
·
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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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 35
·14970-14978
·
IF 3.288
Jingchuang Zhao,Yingzhen Zhang,Xianyu Kang,Yancai Li
Direct methanol fuel cells (DMFCs) have been extensively studied for developing a new non-precious metal catalyst to replace commercial platinum catalysts, due to their expensive cost and susceptibility to CO poisoning. In this work, nanocomposites of nickel oxide/nickel supported by N-doped carbon (NiO/Ni–N/C) were prepared by using a hydrothermal method and further carbonization at different temperatures. The surface morphology and composition of the NiO/Ni–N/C nanocomposites were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). As observed through electrochemical experiments, the NiO/Ni–N/C nanocomposite modified glassy carbon electrode (NiO/Ni–N/C/GCE) exhibits high electrocatalytic activity for the methanol oxidation reaction (MOR) in alkaline solution. Among the nanocomposites, NiO/Ni–N/C carbonized at 500 °C (NiO/Ni–N/C500) displays the highest mass activity (1043 mA mgNi−1) at 0.73 V (vs. Ag/AgCl), which is much higher than that of Ni(OH)2/N–C and NiO/Ni–N/C carbonized at other temperatures (400, 600, and 700 °C). In addition, the catalytic activity of NiO/Ni–N/C500 is 2.12 times that of the commercial Pt/C. NiO/Ni–N/C500/GCE also possesses fast kinetics, excellent stability and CO tolerance. Therefore, the NiO/Ni–N/C500 nanocomposites have great application potential as MOR catalysts.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
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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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Meng Yao,Ao Liu,Chunxian Xing,Bosen Li,Shanshan Pan,Jiahe Zhang,Peipei Su,Haitao Zhang
Supercapacitors have emerged as appealing alternatives to rechargeable energy storage devices in renewable energy generation and storage systems due to their ultra-high power characteristics. However, their broad applications are hindered by their low energy density characteristic. Therefore, the designs of electrodes with high rate and high specific capacitance and electrolytes with wide-potential window are extremely crucial. A novel core–shell heterostructure, TiNb 2 O 7 as the core and C-encapsulated MoS 2 as the shell, was demonstrated. As a result of synergistic effects induced by the core–shell heterostructure, this nanoarchitectural anode exhibited a high rate capability and an excellent cyclic stability, 99% capacity was retented after 500 cycles. Moreover, a nanocomposite ionogel electrolyte composed of ionic liquid (IL), poly(vinylidene fluoride-co-hexafluoropropene)-hexafluoropropylene (PVDF-HFP) and SiO 2 was prepared. In our study, optimized solid lithium-ion capacitors (SLICs) exhibited an impressive energy density of 147.2 Wh kg −1 at 60 °C and an outstanding ultra-long term stability, 93.7% capacity was retented after 10,000 cycles at 1 A g −1 . These outstanding performances could be ascribed to the widened potential window and remarkable ionic conductivity of the ionogel electrolyte. The effective combination of nanoarchitectural anodes and a nanocomposite ionogel provides a novel and profound direction for the fabrication of highly safe and reliable solid lithium-ion capacitors with an enhanced high energy density.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 2
·307-312
·
IF 1.063
Jiang Ping,Li Yifei,Ju Ting,Cheng Wenbo,Xu Jianhua,Han Kun
Infectious of hepatitis C viruses(HCVs) lead to hepatic fibrosis, cirrhosis even hepatoma. Developing rapid and sensitive diagnostic method for HCV is of great importance. Based on the host-and-guest interaction between cucurbit[7]uril(CB[7]) and methylene blue(MB), a CB[7]-graphene nano-composite(CB[7]-N 3 -GO) is raised for the electrochemical detection of HCV DNA. The method is able to linearly detect the HCV nucleic acid in the range of 0.2–10 nmol/L with detection limit as low as 160.4 pmol/L. The proposed detection strategy is able to discriminate the 1b and 6k subtypes of HCV and has a prospective potential in the blood screen for HCV in clinical diagnosis.
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危险品化学品经营许可证（带存储）