Carbon Letters
·
2025
·
IF 5.8
Lee Kang Mi,Lee Jong Dae
In this study, an anode composite material was fabricated by embedding spherical carbon-coated nanosilicon (Si@C) into a layered carbon-coated silicon (L-Si/C) to enhance the capacity and stability of silicon-based lithium-ion batteries. The L-Si/C material was obtained by reacting CaSi 2 through a CO₂-assisted carbonization process, followed by removal of the CaCO 3 byproduct via HCl etching. Si@C particles, prepared using polydopamine as a carbon precursor, were uniformly embedded in the L-Si/C via ultrasonic treatment. The physical properties of the prepared anode composites were analyzed using HR-SEM, EDS, XRD, and BET. The electrochemical performances were investigated using 1 M LiPF 6 in EC:DEC (1:1 vol%) with 10 wt% FEC as the electrolyte, through charge–discharge cycling, rate capability tests, electrochemical impedance spectroscopy (EIS), and differential capacity (dQ/dV) analysis. L-Si/C exhibited the best electrochemical performance under the thermal treatment condition of 720 °C and a CO 2 flow rate of 100 sccm. In addition, the application of ultrasonic treatment improved structural stability and rate capability. Consequently, the S_L-Si/C + Si@C-2 exhibited a high initial discharge capacity of 2700.7 mAh/g at 0.1 C and a capacity of 617.4 mAh/g at a high rate of 6 C.
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 10
·104502
·
IF 3.721
Guofeng Liang,Jilin Huang,Jiawang Li,Yinlong Wu,Guoju Huang,Yan Qi Jin,Hongbin Zeng,Hao Zhang,Jian Chen,Yanshuo Jin,Nan Wang,Fangyan Xie,Hui Meng
Transition metal and nitrogen co-doped carbon-based nanomaterial has been used as non-precious metal catalyst for oxygen reduction reaction (ORR). In this work, bamboo-like carbon nanotubes structured FeCo/N/C electrocatalyst is proved to show much enhanced performance compared with Co/N/C. MIL-53 (Fe) is used as iron source, MIL-53 (Co) is used as cobalt source and ZIF-8 as carbon source. The ball-milling procedure plays a significant role for the distribution of Fe and Co component and the formation of carbon nanotubes, which is believed to enhance the catalytic performance due to abundant electrocatalytic active sites and efficient mass transfer. The as prepared sample obtained by optimized preparation conditions exhibits outstanding ORR activity in acid solution with an onset potential of 0.96 V vs RHE (reversible hydrogen electrode), half-wave potential of 0.78 V, and a current density of 0.575 m A cm−2 at 0.7 V in a H2-O2 fuel cell test, which provides an ideal viewpoint to develop highly efficient catalyst for the oxygen reduction reaction. The high ORR performance could be attributed to the synergistic effect between Fe and Co and the high conductivity and mass transfer of the carbon nanotube.
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JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2023
·
IF 2.8
Li Cui,Bin Zhang,Shuting Zou,Jing Liu,Pingrong Wang,Hui Li,Zhenhai Zhang
In this study we sought to elucidate the therapeutic effects of fenchone on constipation-predominant irritable bowel syndrome (IBS-C) and the underlying mechanisms. An IBS-C model was established in rats by administration of ice water by gavage for 14 days. Fenchone increased the reduced body weight, number of fecal pellets, fecal moisture, and intestinal transit rate, and decreased the enhanced visceral hypersensitivity in the rat model of IBS-C. In addition, fenchone increased the serum content of excitatory neurotransmitters and decreased the serum content of inhibitory neurotransmitters in the IBS-C rat model. Meanwhile, western blot and immunofluorescence experiments indicated that fenchone increased the expressions of SCF and c-Kit. Furthermore, compared with the IBS-C model group, fenchone increased the relative abundance of Lactobacillus , Blautia , Allobaculum , Subdoligranulum , and Ruminococcaceae_UCG-008 , and reduced the relative abundance of Bacteroides , Enterococcus , Alistipes , and Escherichia-Shigella on the genus level. Overall, fenchone ameliorates IBS-C via modulation of the SCF/c-Kit pathway and gut microbiota, and could therefore serve as a novel drug candidate against IBS-C.
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Journal of Energy Chemistry
·
2024
·
IF 14
Dong Zhang,Minghui Zhu,Ran Qin,Peixian Chen,Maoye Yin,Dafeng Zhang,Junchang Liu,Hengshuai Li,Xipeng Pu,Peiqing Cai
Rational design of photocatalyst to maximize the use of sunlight is one of the issues to be solved in photocatalysis technology. In this study, the CuFe 2 O 4 @C/Cd 0.9 Zn 0.1 S (CFO@C/CZS) S-scheme photocatalyst with photothermal effect was synthesized by ultrasonic self-assembly combined with calcination. The dark CFO@C absorbed visible light and partly converted into heat to promote the hydrogen evolution reaction. The presence of heterojunctions inhibited the photogenerated electron-hole recombination. The graphite-carbon layer provided a stable channel for electron transfer, and the presence of magnetic CFO made recycle easier. Under the action of photothermal assistance and heterojunction, the hydrogen evolution rate of the optimal CFO@C/CZS was 80.79 mmol g −1 h −1 , which was 2.55 times and 260.61 times of that of pure CZS and CFO@C, respectively. Notably, the composite samples also exhibit excellent stability and a wide range of environmental adaptability. Through experimental tests and first-principles simulation calculation methods, the plausible mechanism of photoactivity enhancement was proposed. This work provided a feasible strategy of photothermal assistance for the development of heterojunction photocatalysts with distinctive hydrogen evolution.
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高影响因子
Cell Reports
·
2023
·Vol. 42
·期 11
·113349-113349
·
IF 8.8
Shao Q,Wijaya CS,Wang S,Meng X,Yuan C,Ma C,Xu S
Maintaining cellular viability relies on the integrity of the plasma membrane, which must be repaired upon damage. Soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE)-mediated membrane fusion is a crucial mechanism involved in membrane repair. In C. elegans epidermal cell hyp 7, syntaxin-2 (SYX-2) facilitates large membrane wound repair; however, the underlying molecular mechanism remains unclear. Here, we found that SNAP-25 protein RIC-4 and synaptobrevin protein SEC-22 are required for SYX-2 recruitment at the wound site. They interact to form a SNARE complex to promote membrane repair in vivo and fusion in vitro. Moreover, we found that SEC-22 localized in multiple intracellular compartments, including endosomes and the trans-Golgi network, which recruited to the wounds. Furthermore, inhibition of RAB-5 disrupted SEC-22 localization and prevented its interaction with SYX-2. Our findings suggest that RAB-5 facilitates the formation of the RIC-4/SEC-22/SYX-2 SNARE complex and provides valuable insights into the molecular mechanism of how cells repair large membrane wounds.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Riyang Shu,Ying Xu,Longlong Ma,Qi Zhang,Chao Wang,Ying Chen
Many effective methods have been proposed to achieve lignin depolymerization, while controllable product distribution is still hard to realize. Herein, an efficient lignin hydrogenolysis process with controllable product distribution was put forward using Pd/C catalyst cooperated with metal chloride. Results showed that lignin produced a high amount of guaiacols in the presence of ZnCl 2 , while a high amount of phenols in the presence of CrCl 3 . Guaiacylglycerol-β-guaiacyl ether was used as the model compound to carry out the mechanistic investigation. A synergetic catalysis effect between Pd/C and metal chloride was exhibited in this process. And the Lewis acidity was an important factor to determine the product distribution. With the synergetic catalysis of Pd/C and metal chloride, the dissociation energy of β-O-4 bond was reduced significantly, which made the cleavage easier to realize. The phenolic monomer product of guaiacols was produced in the initial stage. Then CrCl 3 catalyst with strong Lewis acidity could further promote the occurrence of demethoxylation and alkylation, converting the guaiacols into phenols. This work figures out the mechanism of product control in the hydrogenolysis process and displays a clear potential for the controllable valorization of lignin.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jing Ouyang,Zilong He,Yi Zhang,Huaming Yang,Qihang Zhao
Organic ligands and metal ions in the metal–organic frameworks (MOFs, a type of porous magnetic metal/carbon nanocomposites obtained through high-temperature carbonization) have caused widespread concerns in the field of microwave absorption because of the existence of various microwave loss mechanisms in these materials. However, MOF-driven microwave absorbing materials with high absorption intensity and wide absorption band still require further research and development. In this work, hollow sphere trimetallic FeCoNi@C microwave absorbing materials via high-temperature carbonization were obtained using FeCoNi-based MOF-74 (FeCoNi-MOF) as the precursor. The effects of different carbonization conditions on the microwave absorption properties of the materials were studied. FeCoNi-MOF-74 annealed at 700 °C showed superior microwave absorption capacity, where the RL value reached −64.75 dB at 15.44 GHz corresponding to the actual application thickness of the absorber (only 2.1 mm), and the minimum RL values reached −69.03 dB at 5.52 GHz. Furthermore, the as-prepared sample can fully cover the Ku band and X band at only 2.1 and 3.1 mm, respectively. The maximum EAB reached 8.08 GHz (9.92–18 GHz) when the thickness of the absorber was 2.47 mm. Such remarkable absorption performance is attributed to the synergetic effects between the multiple loss mechanisms of the FeCoNi@C, and the improved impedance matching characteristic came from the hollow sphere morphology.
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APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Hui Chen,Jie He,Jinsheng Sun
The production of cyclohexanone, of industrial importance, is at a distance to environment friendly and efficiency. As a solution, a mild sustainable catalytic hydrogenation is presented herein, of phenol into cyclohexanone on Pd/C with potassium formate the hydrogen donor under open atmosphere. Some important reaction conditions, such as temperature, reaction time, catalyst, amount of potassium formate, etc. were investigated and analyzed. The positive growth was found to accelerate the conversion rate of phenol while reducing cyclohexanone selectivity by weakening the protection of phosphotungstic acid. Phosphotungstic acid was confirmed to be the co-catalyst exhibiting the highest activity under given conditions. Based on experiments, we have made reasonable assumptions about the reaction mechanism, while the reaction kinetics proves high reaction rates within a wide temperature range, indicating the reaction to be quick process. Furthermore, the good reusability and recyclability of Pd/C catalyst is verified to benefit future industrial applications.
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CARBON
·
2022
·
IF 11.307
Zhe Zou,Mingqiang Ning,Zhenkuang Lei,Xueheng Zhuang,Guoguo Tan,Jianhua Hou,Hui Xu,Qikui Man,Jingbo Li,Run-Wei Li
Ti 3 C 2 T x is considered a candidate for high-efficiency microwave absorption materials due to its adjustable electrical conductivity , low density and high specific surface area in recent years. However, the single absorption mechanism could not meet the practical requirements as the functional microwave absorbers. Herein, 0D/1D/2D architectures of Co@C/MXene with 0D Co nanoparticles , 1D carbon nanotubes (CNTs) and 2D Ti 3 C 2 T x MXene nanosheets were rationally fabricated to enhance the microwave attenuation performance, in which Co@CNTs were in situ grown on Ti 3 C 2 T x MXene nanosheets . By changing the amount of Ti 3 C 2 T x MXene to optimize the impedance matching properties, the Co@C/M − 10 absorber exhibits excellent microwave attenuation performance with a minimum reflection loss of −50.5 dB at 5.9 GHz under a thickness of 4.0 mm. Meanwhile, the maximum effective absorption bandwidth (<−10 dB) of Co@C/M − 10 absorber can reach 5.8 GHz under 2.0 mm. The remarkable absorption performance can be ascribed to the synergistic effects of interface polarizations and magnetic loss. Moreover, the radar cross section (RCS) simulation was also performed via CST. Under the incident angle of 0°, the RCS reduction value of Co@C/M − 10 can reach 33.5 dBm 2 . This work provides a strategy for synthesizing MXene-based composite materials with tunable electromagnetic attenuation and wide absorption bandwidth performance .
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Yue Yao,Baolong Wang,Feng Zhao,Zhen Hu,Yudong Huang
The extensive use of unsaturated polyester resins and their composites has resulted in an increasingly aggravating problem of waste materials which are difficult to remold or degrade endowed by their highly crosslinked network. A simple and facile recovery method to fully degrade resins remains challenging so far. Here, a hindered C–O bond with a carbonyl group in the β-position of steric ester was introduced into the design and preparation of a dimethacrylate monomer and its self-polymerized unsaturated polyester resin. The obtained resin with good thermal, mechanical, and solvent-resistance properties could be efficiently degraded within 3.5 h at 90 °C at an 80% concentration of aqueous hydrazine hydrate. Selective cleavage of the hindered bond due to steric and electronic effects was activated by the prior addition of the introduced carbonyl group. Degradation products rich in benzene and carboxyl/carboxylate groups respectively could be separated readily according to the water solubility, being expected to be reused as a flocculant and other functional additives. This work provides a promising strategy for the facile recycling of unsaturated polyester resins.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xin He,Ming Wu,Zhimin Ao,Bo Lai,Yanbo Zhou,Taicheng An,Shaobin Wang
A series of in-situ carbon-doped TiO 2 (C x /TiO 2 ) composites with a porous and crystalline structure were successfully synthesized via one-step and low-temperature calcination of titanium metal–organic framework (MOF), MIL-125(Ti). The resultant materials were comprehensively investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption measurements, UV–vis diffuse reflectance spectrum (DRS), photoluminescence (PL) spectra and photoelectrochemical measurements, and their photocatalytic activities for bisphenol A (BPA) degradation were assessed. Compared with the benchmark TiO 2 photocatalyst (P25), the C x /TiO 2 composite material with high specific surface, lower band gap, and reduced photogenerated electron hole ratio exhibited outstanding photodegradation activity and durability for BPA, which could be attributed to the combined effect of co-doping of multiple carbon species (substituent carbon and carbonate) and porous structure. During BPA degradation, the holes and superoxide radicals were the primary role oxidative species in the reaction process. Therefore, this new efficient photocatalyst is promising candidate for photodegradation of organic pollutants .
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ORGANIC & BIOMOLECULAR CHEMISTRY
·
2025
·
IF 2.7
Fei Yuan,Yiyuan Xin,Caifeng Yuan,Zhuo Chen,Tongling Qin,Wenxia Hu,Jiahuan Duan,E Tang
A simple, exogenous-base-free, and NBS-mediated C-selenocyanation/cyclization reaction of enaminones with KSeCN under mild conditions, providing a facile route to 2-aminoselenazole products, has been developed. This efficient protocol is postulated to first undergo the NBS-oxidated polarity reversal of the reactive SeCN- anion to form N-selenocyanosuccinimide as an electrophilic selenium source, which can induce the C-selenocyanation of enaminones and enamino esters, followed by a nucleophilic cyclization promoted by in-situ yielded HBr.
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