Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
Yin Jinpeng,Wang Guanqin,Kong Dongqing,Li Chuang,Zhang Qiang,Xie Dongbai,Yan Yangyang,Li Ning,Li Qiang
To enhance the volumetric energy density and initial coulombic efficiency (ICE) of titanium oxide (TiO 2 ) as anode electrode material for lithium-ion batteries (LIB), this study employed a surface-confined in-situ inter-growth mechanism to prepare a TiO 2 embedded carbon microsphere composite. The results revealed that the composite exhibited a highly integrated structure of TiO 2 with oxygen vacancies and carbon, along with an exceptionally small specific surface area of 11.52 m 2 /g. Due to its unique microstructure, the composite demonstrated remarkable lithium storage properties, including a high ICE of 75%, a notable capacity of 426.8 mAh/g after 200 cycles at 0.2 A/g, superior rate performance of 210.1 mAh/g at 5 A/g, and an outstanding cycle life, with a capacity decay rate of only 0.003% per cycle over 2000 cycles. Furthermore, electrochemical kinetic studies further validated the advantages of this microstructure.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Li Gao,Ying Wang,Chunyu Cui,Wenji Zheng,Xiaoming Yan,Peng Zhang,Lei Hu,Xuemei Wu,Lin Zhuang,Gaohong He
Developing anion exchange membranes (AEMs) having high hydroxide conductivity, swelling resistance and excellent alkaline stability is a challenge for fuel cells now. Herein, a universal and controllable approach of grafting rigid side chain is first proposed to construct connected ion transport nano-channels. A new route is also provided to prepare AEMs with stable symmetric saturated heterocyclic amomium. The rigid side chain is introduced onto poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) by the Friedel-Crafts acylation with 4-fluorobenzoyl chloride and subsequent reaction between phenyl fluoride and secondary amine of 1-methylpiperazine. Then the terminal piperazinium is produced by the reaction between tertiary amine of 1-methylpiperazine and methyl iodide. Rigid branches expand free volume to construct connected ion transport nano-channels, leading to excellent conductivity (108 mS cm −1 at 60 °C) that is higher than those of other reported symmetric heterocyclic amomium functionalized AEMs (33–89 mS cm −1 at 60 °C). Due to the high conductivity, the H 2 /O 2 cell employing this membrane achieves one of the highest peak power densities (1210 mW cm −2 at 2600 mA cm −2 ) so far. In addition, the IEC of the membrane remains constant after testing in 1 M NaOH at 60 °C over 500 h.
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高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2024
·
IF 3.9
Xuemeng Ji,Dancai Fan,Jin Wang,Bowei Zhang,Yaozhong Hu,Huan Lv,Jing Wu,Yi Sun,Jingmin Liu,Yan Zhang,Shuo Wang
Cronobacter sakazakii poses a significant threat, particularly to neonates and infants. Despite its strong pathogenicity, understanding of C. sakazakii biofilms and their role in infections remains limited. This study investigates the roles of HmsP and c-di-GMP in biofilm formation and identifies key genetic and proteomic elements involved. Gene knockout experiments reveal that HmsP and c-di-GMP are linked to biofilm formation in C. sakazakii. Comparative proteomic profiling identifies the lysozyme inhibitor protein LprI, which is downregulated in hmsP knockouts and upregulated in c-di-GMP knockouts, as a potential biofilm formation factor. Further investigation of the lprI knockout strain shows significantly reduced biofilm formation and decreased virulence in a rat infection model. Additionally, LprI is demonstrated to bind extracellular DNA, suggesting a role in anchoring C. sakazakii within the biofilm matrix. These findings enhance our understanding of the molecular mechanisms underlying biofilm formation and virulence in C. sakazakii, offering potential targets for therapeutic intervention and food production settings.
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PubMed
高影响因子
Heliyon
·
2023
·
IF 4
Ashok Biswas,Susmita Dey,Aiping Xiao,Siqi Huang,Ziggiju Mesenbet Birhanie,Yong Deng,Liangliang Liu,Defang Li
Different parts of Corchorus olitorius and C. capsularis possess different antioxidant compounds. This study investigated the phytochemical components and antioxidant capacities of ultrasound-assisted extraction of different plant parts of both species using spectrophotometry at various phenological stages. Results also indicate that leaves, stems and roots of C. olitorius at various growth stages showed higher phytochemical components and antioxidant potential compared to C. capsularis . The phytochemical components from roots to leaves in C. olitorius including total polyphenol 0.97–11.11 mg GAE/g DW, total flavonoid 0.99–7.78 mg QE/g DW and total tannin 4.02–26.89 TA E/g DW, whereas C. capsularis total polyphenol 1.04–7.93 mg GAE/g DW, total flavonoid 0.77–5.5.92 mg QE/g DW and total tannin content 3.17–22.73 TA E/g DW. C. olitorius produced overall 22.23%, 13.61%, 12.24% higher total polyphenol, total flavonoid and total tannin, respectively compare to C. capsularis. Different parts extract also significantly affected antioxidant capacities including DPPH, ABTS, and FRAP activity with values of 22.03–79.46% inhibition, 10.84–104.10 μmol TE/g DW, and 10.84–104.10 μmol Fe 2+/ g DW respectively for C. olitorius, while C. capsularis demonstrated 14.03–70.97% of DPPH inhibition, 9.16–95.60 μmol TE/g DW of ABTS and 5.31–71.82 μmol Fe 2+/ g DW of FRAP activity. Moreover, leaves of the flowering stage, young stems and aged roots of both species displayed a higher content of phytochemical and antioxidant activities than other growth stages. A positive correlation between the phytochemical and antioxidant potential indicated that phenolic constituents solely affected antioxidant activity. Thus, this study established that the plant's parts and phenological growth stages significantly influence the concentration of phytoconstituents and antioxidant activities, and determine the harvesting stages of the different organs of C. olitorius and C. capsularis for considerable medicinal importance as folk and industry.
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高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Wenhui Tu,Zewei Chen,Yuanpeng Cao,Jianguo Duan,Jingjing He,Runlin Li,Peng Dong,Xianshu Wang,Yingjie Zhang,Ding Wang
Olivine-structured LiMnPO 4 -based cathodes have generated enormous development prospects due to their high energy density , good structural stability , and low cost. However, their scale of application is limited by high electronic and ionic insulativity. In this study, we designed and synthesized a bi-functional interfacial modified composite, 0.9LiMnPO 4 @0.1LiFePO 4 /C ( [email protected] /C ), using mechanochemical activation-assisted hydrothermal technology. The innovative Li-storage structure consists of a high-energy density LiMnPO 4 (LMP) core, a uniformly coated LiFePO 4 (LFP) layer with improved ionic conductivity as the secondary outer shell, and an in-situ coated carbon film with high conductivity as the outermost functional skin. As anticipated, the [email protected] /C composite exhibits outstanding Li-storage properties, demonstrating discharge capacities as high as 157.1 mAh g −1 and 146.7 mAh g −1 at 0.1 C and 1 C rates, respectively. Moreover, it exhibits an ultrahigh capacity retention of 92.5 % after 500 charge and discharge cycles.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395710
·
IF 3.551
Yan Wang,Xiaochuang Di,Xiang Gao,Xinming Wu
Carbon-based composites have triggered tremendous attention in the development of high-efficiency microwave absorbers, due to their compatibility, light weight, and high microwave absorption. However, fabricating carbon-based absorbers with a strong absorption ability in a broad frequency range is challenging. Hence, a facile strategy was used to produce Co@C derived from a zeolitic imidazolate framework (ZIF)@ graphene. The Co@C@RGO composite was obtained by annealing the ZIF67/GO nanocomposite precursor at 650 °C in a nitrogen atmosphere. Due to the magnetic loss induced by the Co particles, the dielectric loss generated by the carbon skeletons and graphene, and the interfacial polarization between the components, the hierarchical composite exhibits superior electromagnetic (EM) wave absorption properties. The optimal reflection loss (RL) of the Co@C@ RGO composite can be up to −67.5 dB at 2.6 mm, and the effective bandwidth (≥−10 dB) is 5.4 GHz (10–15.4 GHz) with a thickness of 2 mm at 20 wt% loading. The dipolar polarization caused by graphene, as well as enhanced impedance matching, synergistic effect and interfacial effect among the components, increase the microwave absorption performance of the composite. This work may open a new path to use the Co@C@RGO composite with its high-efficiency EM wave properties as an absorber.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Safdar Ali,Saddique Jaffer,Inamullah Maitlo,Farooq Khurum Shehzad,Qunying Wang,Sikandar Ali,Muhammad Yasir Akram,Yong He,Jun Nie
Silicon based anode materials has got significant attention in recent years due to its environmental affinity, lower cost and high capacity in lithium ion batteries . The Photo cured 3D porous Silica-carbon membrane (SiO 2 –C material) was synthesized via binary phase solid state photo-polymerization, freeze dried to obtain porous membrane and then used as template to get silica deposited membrane by chemical vapor deposition method (CVD) at 30 ° C, followed by calcination . The silicon deposition has been confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS). The Barret-Joyner-Halenda (BJH) pore size distribution results showed the pore size of 10.2924 nm and surface area of 21.1957 m 2 /g with cumulative pore volume of 0.040248 cm³/g. The first discharge capacity reached to 719 mAhg −1 with 79.94% columbic efficiency regarding first cycle and discharge capacity for 100 cycles reached to 693 mAhg −1 with 99% columbic efficiency, which indicated high reaction reversibility. The silicon deposition with a porous structure improved the electronic conductivity and stabilized the material. The better electrochemical performance observed could be due to porous structure and carbon matrix of SiO 2 –C material.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Qikui Man,Zhenkuang Lei,Anping Wang,Chunlin Zheng,Xueheng Zhuang,Guoguo Tan,Shuwen Chen,Jianhua Hou,Mingqiang Ning,Run-Wei Li
The in situ formation of interconnected carbon nanotubes (CNTs) networks on the surfaces of metal-organic framework (MOF) derivatives is an efficient method for rationally constructing heterogeneous interfaces and developing high-performance electromagnetic wave absorption materials. A series of Co x Ni y @C composite absorbers with abundant CNTs on their surfaces prepared by pyrolyzing MOF precursors in an Ar atmosphere is reported in this study. The S-3 composite absorber had a distinct structural morphology, and optimal wave absorption performance was obtained when the final pyrolysis temperature was 800 °C. At matched thicknesses of 2.0 mm and 3.5 mm, an effective absorption bandwidth (EAB) of 4.5 GHz and a minimum reflection loss (RL min ) of −43.5 dB were achieved when the absorber filling ratio was 15 wt%. This strategy and the results reported in this study are anticipated to encourage future studies into the controlled growth of metal-catalyzed CNTs and inspire new ideas for designing and preparing enhanced microwave absorber materials at the micro-nano scale.
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高影响因子
Functional Materials Letters
·
2019
·
IF 1.388
Jingwei Li,Shixi Zhao,Xia Wu,Lüqiang Yu,Enlai Zhao,Cewen Nan
A series of glass cathode materials x Li 2 O–50V 2 O 5 –(50− x )P 2 O 5 ( x = 2 0 , 25, 30, 35 and 40) have been synthesized by a simple melting–quenching method. 30Li 2 O–50V 2 O 5 –20P 2 O 5 glass (LVP30) shows the best cycling performance with a preferable capacity retention after 50 cycles. Then, we prepared a series of carbon-coated LVP30 glass-ceramic cathode materials by carbon coating and heat treatment. The carbon-coated LVP30 samples consist of the crystalline phase V 2 O 3 , VO 2 and Li 2 O–V 2 O 5 –P 2 O 5 glass. Among the carbon-coated LVP30 samples, LVP30-15C sample exhibits the best cycling and rate performance. It can retain a discharge capacity of 140 mAh ⋅ g − 1 after 100 cycles. This unique glass-ceramic structure can result in good conductivity and structural ductility.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Tao Tang,Chengcai Li,Wenyu He,Wei Hong,Hailin Zhu,Guojin Liu,Yuan Yu,Caihong Lei
In this paper, the ZIF-8/ZnO mixture was sintered at high temperature to prepare C-ZnO composite nano-particles with excellent photocatalytic degradation ability under ultraviolet light , and then blended with PVDF to fabricate PVDF composite membrane with capabilities of photocatalytic degradation of methylene blue(MB) via solution phase conversion. The results show that the photocatalytic performance of the prepared C-ZnO composite particles was the best when the ZIF-8/ZnO mass ratio was 1:2, and the photocatalytic degradation efficiency of the PVDF composite film prepared was as high as 95.02% when the composite particle content was 15%. The photocatalytic activity of C-ZnO composite material benefits from the synergy between the two. Moreover, the efficiency of photodegradation of MB remained above 90% after the composite membrane was subjected to five cycles of experiments, which solved the problem that the traditional photocatalyst was difficult to recycle. In addition, it is found that O 2 - plays a major role in the photocatalytic degradation of MB through free radical capture experiments. All in all, the PVDF composite membrane containing C-ZnO composite particles has a foreseeable potential in the field of photocatalytic printing and dyeing wastewater in the future.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Yunfang Gao,Li Guan,Hanli Fu,Xin Xu,Gaoyuan He,Yan Zhang,Jiahao Wu,Haihua Wu
To overcome the irreversible sulfation and improve the lifespan of lead-acid batteries (LABs), we propose a novel Pb/PbO@C nanocomposite with botryoidal architecture derived from eggplant biomass as effective additives to the negative plates. Such unique structure, sharing a three-dimensional conductive carbon network with macropores , effectively facilitates electron transport and boosts ion diffusion as well as suppresses the growth of PbSO 4 during charge-discharge process. The hierarchical carbon framework is also responsible for dispersing active material Pb to limit the particle aggregation. As a result, the LAB equipped with 2.0 wt% Pb/PbO@C-700 shows an excellent rate capability and outstanding high-rate partial state of charge (HRPSoC) cycling performance of 8.2 times compared to that of the LAB without additive. Pb/PbO@C additive is expected to be a promising candidate for commercial application in LABs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhenghe Zhang,Lisheng Cheng,Peter Kroll,Jing Tan,Weimin Yang
Waste corrugated boards reformed by wood fiber are good precursor to be carbonized into multihole carbon materials for high-value utilization. Herein, waste corrugated board was recycled to fabricate functional carbon-silicon composite by the heat treatment under 1100 °C. The SiC nf and SiC nano-sphere were self-assembled during the carbothermal reduction to construct the nano-porous structure. The carbon coating on SiC can enhance the interfacial polarization effect. Owing to this gradient structure, the as-prepared carbon-silicon carbide composite exhibited a well electromagnetic interference shielding effectiveness (EMI SE) of ∼49.46 dB in the X-band. Moreover, its absolute EMI SE is observed to be ∼1561.51 dB∙cm 2 ∙g −1 , which reveals excellent EMI shielding performance combined with light weight. This good overall performance, along with environmentally friendly, ease of mass production, pave way for the large-scale practical applications in EMI shielding.
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高影响因子
危险品化学品经营许可证（带存储）