PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2013
·Vol. 16
·期 9
·4135-4142
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IF 3.829
Xiaomei Ma,Mingxian Liu,Lihua Gan,Pranav K. Tripathi,Yunhui Zhao,Dazhang Zhu,Zijie Xu,Longwu Chen
In this paper, we demonstrate the design and synthesis of novel mesoporous Si@C microspheres as anode materials for high-performance lithium-ion batteries. SiO2 nanoparticles modified with hexadecyl trimethyl ammonium bromide are enveloped within resorcinol–formaldehyde polymer microspheres which form in the ethanol–water–ammonia system. Mesoporous voids between Si nanoparticles and the carbon framework are generated after carbonization at 800 °C and magnesiothermic reduction at 650 °C. The resultant Si@C microspheres show regular spherical shapes with a mean diameter of about 500 nm, a mesopore size of 3.2 nm and specific surface areas of 401–424 m2 g−1. Mesoporosity of Si@C microspheres effectively buffers the volume expansion/shrinkage of Si nanoparticles during Li ion insertion/extraction, which endows mesoporous Si@C microspheres with excellent electrochemical performance and cycle stability when they are used as lithium-ion battery anode materials. A typical sample of mesoporous Si@C microspheres presents a specific capacity of 1637 and 1375 mA h g−1 at first discharge and charge under a current density of 50 mA g−1. After 100 cycles, the charge capacity remains 1053 mA h g−1 with a coulombic efficiency of 99%, showing good cycle stability of the anode. This finding highlights the potential application of mesoporous Si@C microspheres in lithium-ion battery anode materials.
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SENSORS AND ACTUATORS B-CHEMICAL
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2013
·
IF 3.535
Pengfei Ding,Ruxiu Liu,Shihui Liu,Xueyin Mao,Ruifen Hu,Guang Li
This report describes a novel method to realize high sensitive C-reactive protein (hs-CRP) by using a quartz crystal microbalance (QCM) immunosensor based on 20 nm gold nanoparticles conjugated anti-CRP antibodies. A sandwich-type assay was established: CRP was firstly recognized by the anti-CRP antibody which was immobilized on the gold electrode of the QCM and the sensitivity was enhanced further by binding AuNP conjugated anti-CRP antibody secondly. The response of the QCM is observed to be linearly relative to the CRP concentration in the range of 20 ng/mL to 30 μg/mL and the detection limit is enhanced to a great extend by the amplification procedure. The sensor was regenerated online by the solution of 3 mol/L Urea while preserving the activity of the immunosensor.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 3
·2769-2774
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IF 1.798
Yu Qi,Chen Hanlin,Chen Ping,Wang Qi,Lu Chun,Jia Caixia
Carbon nanofibers containing Fe 3 O 4 nanoparticles (Fe 3 O 4 @C nanofibers) were synthesized by electrospinning technique followed by heat treatment, and then the as-prepared nanofibers were loaded in bismaleimide (BMI) resin to prepare nanocomposites. The phase structure and morphology of nanofibers were characterized by X-ray diffraction and scanning electron microscope, respectively. The complex permittivity and permeability of nanocomposites were measured by vector network analyzer using a coaxial line method in the frequency range of 1–18 GHz, and the microwave absorption performance was accordingly evaluated. The results indicated that the Fe 3 O 4 @C nanofibers/BMI composites showed excellent low-frequency electromagnetic wave absorption properties with a minimum RL value of −22 dB at 2.1 GHz corresponding to a thickness of 6 mm and exceeding −10 dB with thickness of 3–6 mm in the whole S band (2–4 GHz). The strong absorption in low frequency is attributed to good matching characteristics of dielectric loss and magnetic loss, which can be efficiently tailored by combination of magnetic Fe 3 O 4 and dielectric carbon layer through electrospining technology. The novel Fe 3 O 4 @C nanofibers loaded in BMI resin can provide an effective solution for pressing problem in present that how to produce lightweight microwave absorbing nanocomposites with excellent low-frequency electromagnetic absorption properties.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yuying Sun,Juan Wu,Tianjin Ma,Pengchao Wang,Chunyue Cui,Dong Ma
Carbon–coated Bi 2 MoO 6 (C@BM) composites have been successfully synthesized via two–step hydrothermal method. The morphology, structure and photocatalytic performance of the composites in the degradation of Rhodamine B (Rh B) are characterized. The results show that the C@BM composites exhibit enhanced photocatalytic performance in the degradation of Rh B with maximum degradation rates of 90% (210 min) under visible light irradiation. 1.0%C@BM sample shows the highest photocatalytic activity, and the improved photocatalytic performance is mainly ascribed to the formation of Mo O C and Bi O C bonds. The bonds could promote electron transfer from Bi 2 MoO 6 to carbon layer and inhibit the recombination of electron–hole pairs with the presence of carbon layer in the composites. Moreover, the carbon layer on Bi 2 MoO 6 could enhance the absorption in the visible light region. In the photocatalytic degradation process, O 2 − and holes are the predominant active species for the decomposition of Rh B.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jiahua Deng,Weijie Tang,Dong Han,Zhanye Xu,Tian Zhang,Haitao Huang,Genzhi Sun,Lili Zhang,Linfei Lai
The rapid development of wearable and portable electronics has driven an increasing demand for flexible energy storage devices. Hydrogel electrolytes with both mechanical robustness and high ionic conductivity are essential for achieving high-performance and safe flexible electronics. Here, we present a dual-network hydrogel electrolyte composed of zinc tetrafluoroborate (Zn(BF 4 ) 2 ), polyacrylamide (PAM), and gelatin (denoted as PGx-Zn). The PG 3 -Zn hydrogel containing 3 wt% gelatin demonstrates exceptional mechanical properties with a high elongation at break of 1193 % and a tensile stress of 88 kPa, outperforming gelatin-free hydrogels by 1.67 and 2.26 times. The incorporation of Zn(BF 4 ) 2 effectively disrupts the hydrogen-bonding network of water, stabilizes the folded structure of gelatin, and maintains both outstanding mechanical strength and high ionic conductivity of the hydrogel. PG 3 -Zn has an ionic conductivity of 0.26 S m −1 at −80 °C, enabling supercapacitors to retain 73 %, 68 %, and 61 % of the room temperature capacitance at −40 °C, −60 °C, and −80 °C, respectively. This work offers a promising pathway for developing hydrogel electrolytes with superior mechanical and ionic conductivity for low-temperature, high-power energy storage applications.
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Journal of Materials Chemistry A
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2024
·
IF 10.7
Yujie Wei,Jianying Wang,Yahang Shang,Chang Lv,Xiaoyang He,Tao Wang,Zuofeng Chen,Lvlv Ji,Sheng Wang
Transition metal dichalcogenides are recognized as promising electrocatalysts for hydrogen evolution reaction (HER), but their catalytic performances still require further enhancement. Herein, Ru-doped cubic CoSe2 with leaf-like microarray hollow structure supported on carbon cloth (Ru-c-CoSe2@CC) is rationally fabricated via a strategy involving in situ growth of Co-ZIF, Ru3+ ions etching and selenization steps. The chemical etching step transforms the precursor sample from Co-ZIF to RuCo-LDH and the subsequent selenization step observes crystal phase transformation and Ru-doping of CoSe2 to form Ru-c-CoSe2. Compared with orthorhombic CoSe2 and pristine c-CoSe2, the optimized electrocatalyst Ru-c-CoSe2/CC-3 shows significantly enhanced HER catalytic performance in both acidic and alkaline media. Theoretical investigations demonstrate the charge-transfer redistribution triggered by Ru dopants, optimizing the electronic states of the adjacent Co atoms with boosted intrinsic catalytic activity. Additionally, the leaf-like microarray hollow structure is highly desirable in active site expose and mass transfer due to its superaerophobic interfacial property.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengwen Zhang,Fanyu Meng,Binyang Jiang,Jinsheng Li,Lei Fan,Shoulei Yang
To further enhance the performance of Al 2 O 3 -Ti(C,N) composites, this study employed novel sinter forging and dynamic sinter forging techniques, comparing them with conventional hot pressing and oscillatory pressure sintering. The results revealed that the composites produced by all four processes exhibited high density and no phase transition or formation of new phases. However, the composites prepared by sinter forging and dynamic sinter forging exhibited significantly improved strength and hardness. The hardness of the composites produced by sinter forging increased to 23.39 GPa, while the strength reached 1142 MPa, representing a 61 % improvement compared to those sintered by hot pressing. This improvement can be attributed to the significant plastic deformation induced by the sinter-forging process, which results in a higher dislocation density at the grain boundaries and within certain grains, enhanced coordinated deformation between grains, and stronger grain boundary bonding. Furthermore, the average grain size was smaller. Therefore, sinter forging and dynamic sinter forging offer substantial advantages in the preparation of advanced ceramics.
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Surfaces and Interfaces
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2024
·
IF 5.7
Xiaonong Wang,Liping Liu,Xiaoping Wang,Xiujun Bai,Jingu Qin,Xiaoxia Li,Bin Wang
Lightweight absorbers with effective broad absorption and high thermal stability are highly desirable in the field of electromagnetic wave absorption. In this work, we introduce a facile carbon thermal shock method to prepare ZrO 2 /C composites using UIO 66 (Zr) as the precursor. The instant heating and cooling process ensures the uniform deposition of nano-sized ZrO 2 ( ca . 5–15 nm) on graphene, exhibiting an ultrahigh interfacial number density of ca. 10 15 m −2 that favors polarization loss. Due to the synergetic effect of dielectric loss and impedance matching, the prepared ZrO 2 /graphene composites show tunable wide-microwave absorption performance by adjusting the heat temperature, and possess a wide absorption band covering the entire X and Ku band. Notably, the ZrO 2 /graphene composites show high thermal stability up to 1000 °C, which presents great potential for microwave absorption applications.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2024
·
IF 5.9
Yanping Ren,Xiaoqiang Fan,Kaiyue Lin,Shipeng Chen,Minhao Zhu
The preparation of a low shearing shell on the surface of carbon spheres (CS) is an attractive strategy to improve the lubrication properties of CS. In this study, core–shell structural C@Ag particles were prepared using CS as the hard core and Ag nanoparticles as the soft shell. Then, the additives were mixed with Polyalphaolefin 20 to prepare the C@Ag core–shell-enhanced lithium complex grease (C@Ag-LCG). The physicochemical properties, corrosion resistance, and tribological behaviors of LCGs were investigated. C@Ag-LCG exhibited the best high-temperature resistance and colloidal stability compared with the CS-enhanced lithium complex grease (LCG) and pure LCG. The dropping point and oil separation rate of 0.05 wt% C@Ag-LCG were 255 °C and 2.36 %, respectively. The tribological behavior of greases was tested using a four-ball friction tester, and the main damage mechanism was abrasive wear. The C@Ag additive reduced the average friction coefficient and wear spot diameter by 27.17 % and 26.12 %, respectively. The improved properties were attributed to the synergistic lubrication of hard CS core and soft Ag shell with the rolling, filling, and self-repairing effects, C@Ag deposit films and the self-lubricating oil film, as well as the thickener film and the tribochemical film at the frictional interfaces.
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CHEMICAL PHYSICS LETTERS
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2024
·
IF 2.8
Mina Wang,Xiaoyan Yuan
Pomegranate-like MoC/C nanospheres were prepared by magnesiothermic reduction of spherical polypyrrole-phosphopolybdate. The MoC/C nanospheres showed good hydrogen evolution reaction (HER) activity in alkaline media: the overpotential (η) of 106 to reach 10 mA cm −2 . And the alkaline electrolytic cell of MoC/C-700‖IrO 2 inquired 1.82 and 1.93 V to deliver 500 and 1000 mA cm −2 for overall water splitting. The significant HER activity was due to the special microstructure, homodisperse MoC grains, and P, N codoped carbon matrix to bring more active sites and faster electron transport. Meanwhile, the thin carbon coating was helpful to improve their catalyst durability.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2024
·
IF 4.4
Xuyong Tang,Fengxi Li,Sijun Huang,Li Xu,Lei Wang,Yi Guo
Nicotinamide-adenine dinucleotide (NADH) as biomimetic units combined with copper ion to form laccases mimics (Cu-NADH). Cu-NADH has the enhanced activity of copper center to mediate aryl C–H amination using air as green oxidants. It could successfully catalyze oxidative coupling between different aromatic compounds and 4-phenylurazole (yield: 72 ∼ 91 %). Recycling catalytic ability (up to 6 times) showed its excellent stability. The Cu-NADH nanozyme was certificated to catalyze C–H amination effectively, and highlighted that it was a proper way to design catalysts according to enzyme-like catalyzing non-natural reaction.
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DENTAL MATERIALS
·
2024
·
IF 4.6
Xuedong Bai,Mengxiao Xu,Shixin Jin,Edmond H.N. Pow,Yanning Chen,James K.H. Tsoi
Objectives To proof the feasibility of direct colour printing on 3Y-TZP using 222 nm UV-C through investigating the degree and durability of the colour changes, and testifying whether surface, mechanical and biological properties are influenced by the treatment. Methods 222 nm UV-C light (Irradiance: 1.870 mW/cm 2 ) was used to treat 3Y-TZP for durations from 15 min to 24 h. ΔE*, TP, crystalline structure, surface morphology, S a , BFS and biological activities were investigated before and after irradiation. SPSS 28.0 was used for statistical analysis (α = 0.05). Results 222 nm UV-C irradiation was capable to shade white 3Y-TZP into tooth colours. With the increase of ΔE*, TP decreased, such that the longer the irradiation time, the higher the ΔE* (logarithmic relationship) and lower the TP. Despite the induced optical changes being prone to fade, the process can be predicted by inversely proportional relationships between ΔE*, TP and the testing points. The treated surface exhibited enhanced hydrophilicity, while the recovery phenomenon was observed. Other properties were not altered by the treatment. Significance This is the seminal study demonstrating the feasibility of direct colour printing on 3Y-TZP using 222 nm UV-C. The new relationship between the colour centre and E g of 3Y-TZP was established, whereas the induced optical changes were stabilised after a certain period and were highly predictable by controlling the irradiation periods. The irradiation was only correlated to the electron excitation and oxygen vacancies, and would not lead to any changes of other properties. A simple, safe and promising approach to achieve satisfactory colours on 3Y-TZP in clinical practice can be developed.
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