RSC Advances
·
2014
·Vol. 4
·期 74
·39312-39315
·
IF 3.708
Yanqing Lai,Fuhua Yang,Zhian Zhang,Shaofeng Jiang,Jie Li
Porous hollow carbon spheres (PHCSs) with high surface area and large pore volume were synthesised using a facile template method. After selenium (Se) encapsulation, Se/PHCS composite was formed. The obtained Se/PHCS composite was demonstrated as a suitable cathode material for lithium–selenium batteries.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhuocheng Xie,Jialin Bai,Xiumin Yao,Xuejian Liu,Hanning Xiao
Mesocarbon microbeads (MCMB) have significant potential for enhancing the dry friction performance of SiC. However, the weak bonding between MCMB and SiC leads to a high wear rate in MCMB-SiC composites. This study addressed this issue by in situ formation of a SiC shell on the MCMB surface using the molten salt templating (MSS) method, followed by preparing MCMB@SiC-SiC composites through hot-pressing sintering. The in-situ SiC shell created a strong chemical bond between the MCMB and SiC, improving the interaction between the phases. Comprehensive investigations into the effects of the MCMB@SiC content on the microstructure, mechanical properties, dry friction, and wear performance revealed that the MCMB@SiC-SiC composites exhibited excellent dry friction performance, with a coefficient of 0.24 and a wear rate of 6.6 × 10 −7 mm 3 N −1 m −1 . Compared with the MCMB-SiC composites without the shell structure, the MCMB@SiC-SiC composites exhibited a 36 % reduction in the dry friction coefficient (μ) and an 81 % reduction in the wear rate (WR). The SiC shell structure effectively prevented MCMB extraction and SiC spalling, making this innovative design a promising solution for enhancing the performance of SiC as a sealing material under severe conditions.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Bao-Shui Wu,Peng Wang,Shu-Hua Teng
Mesoporous carbon-coated iron oxide (α-Fe 2 O 3 @C) nanoparticles were hydrothermally synthesized by using α-Fe 2 O 3 nanospheres (ca. 50 nm) as the cores and resorcinol as the carbon source of the shells. The formation of the mesoporous carbon coatings was confirmed by means of SEM, TEM , FT-IR, TG, XPS and BET measurements. Moreover, the coating thickness was easily adjusted to be 4, 7 and 10 nm by changing the amount of resorcinol. When used as the anodes for lithium-ion batteries (LIBs), the α-Fe 2 O 3 @C nanoparticles exhibited significantly improved electrochemical properties as compared to pure α-Fe 2 O 3 nanoparticles. With the increase of the coating thickness, the α-Fe 2 O 3 @C electrodes presented an initial increase and subsequent decrease in their cycling stability and rate performance. Especially, the α-Fe 2 O 3 @C-7 nanoparticles displayed a high reversible capacity of 1223 mA h/g at 1 A/g, a good cycling stability retaining 1093 mA h/g at 1 A/g after 100 cycles as well as a remarkable rate performance of 570 mA h/g at 5 A/g. The quantitative kinetic analysis revealed that 58 % of the charge storage was contributed by the capacitive process at 0.5 mV/s. The well-defined core-shell structure and superior electrochemical performance of the α-Fe 2 O 3 @C-7 nanoparticles will make them a promising anode for LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wenlong Liu,Jianzong Man,Xiaodong Sun,Weijia Liu,Yehong Du,Qian Wang,Zhongsheng Wen,Song Li,Juncai Sun
lithium (Li) metal has emerged as one of the most promising anode materials for next-generation batteries, attracting considerable interest owing to its exceptional high energy density and specific capacity. However, severe volume expansion and dendritic growth during cycling critically hinder the practical application of Li metal anodes. Herein, a hollow carbon sphere-encapsulating cobalt oxide (CoO) core (CoO/CS) framework was fabricated through a layer-by-layer assembly and controlled etching approach, which effectively suppresses dendrite formation in Li metal anodes. Density functional theory (DFT) calculations reveal that the CoO core exhibits significantly higher Li adsorption energy compared to the graphite shell, demonstrating its preferential role in guiding Li deposition. COMSOL Multiphysics simulations demonstrate that the CoO core effectively optimizes the local current density distribution. Consequently, the Li + preferentially nucleates at the CoO core due to its lithiophilic character, sequentially filling the hollow carbon sphere's interior volume. The hollow architecture provides abundant nucleation sites and sufficient void space to accommodate deposited Li metal, effectively mitigating volume changes during cycling. The synergistic combination of the hollow carbon structure and lithiophilic CoO core enables exceptional stability (operation exceeding 1700 h). Finally, the full cell capacity of CoO/CS electrode shows significant improvement across various current densities.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaolin Lan,Ran Wang,Wenbo Liu,Zhanhua Huang,Pengyang Deng,Zhijiang Wang
Selecting suitable components and microstructure are effective way to design intense coupling of wave impedance and electromagnetic dissipation capacity in the field of electromagnetic (EM) wave absorption materials. Herein, we propose the construction of a novel composite composed of carbon fibers derived from biomass serve as a skeleton to support the loaded with flower-like FeS (FeS/hollow C). The unique microstructure creates the generation of abundant heterogeneous interfaces, impedance matching and multiple loss mechanism, allowing for synergistic effect of dielectric loss and magnetic loss, thereby promoting their EM absorbing properties. The FeS/hollow C absorber exhibited excellent EM wave absorption performance, with an effective absorption bandwidth (EAB) of 7.20 GHz, and a minimum reflection loss (RL) of −65 dB with the thickness of 2.2 mm. The study provides a new strategy for constructing composite absorbers with ingenious structures, which is significant for the preparation, development, and functional application of biomass-based materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Zhian Zhang,Qiang Li,Yanqing Lai,Jie Li
A polyaniline-decorated hollow carbon nanofiber (HCNF@PANI) hybrid nanostructure was prepared as a conductive matrix for effective trapping of sulfur and polysulfides as a cathode material for Li–S batteries. The synthesized composites were characterized and examined by X-ray diffraction, Fourier transformation infrared spectroscopy, nitrogen adsorption–desorption measurements, field emission scanning electron microscopy, scanning transmission electron microscopy, and electrochemical methods, such as cyclic voltammetry, galvanostatic charge–discharge tests, and rate performance tests. The obtained HCNF@PANI-S composite showed an obvious core–shell structure with a PANI layer coating on the surface of the HCNF, and sulfur homogeneously distributes in the coating layer. The HCNF@PANI-S composite exhibited much better electrochemical performance than the HCNF-S composite, which delivered initial discharge capacity of 960 mAh g–1 and maintained 535 mAh g–1 after 200 cycles at 0.5 C rate. The improvements of electrochemical performances may be attributed to the unique hybrid nanostructure of HCNF@PANI and good dispersion of sulfur in the HCNF@PANI-S composite.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 12
·4965-4970
·
IF 1.821
Yinhui Yi,Heng Sun,Gangbing Zhu,Zhen Zhang,Xiangyang Wu
Due to being harmful to the human health, the qualitative and quantitative determination of rhodamine B (RhB) is of great significance. In this paper, per-6-thio-β-cyclodextrin functionalized nanogold/hollow carbon nanospheres (β-CD-AuNPs/HCNS) nanohybrids were prepared and then applied successfully for the highly sensitive electrochemical detection of RhB. Due to the synergetic effects from the HCNS (excellent electrochemical properties and large surface area), β-CD (high host–guest recognition and water-solubility) and AuNPs (excellent electrocatalytic activity), the oxidation peak currents of RhB on the β-CD-AuNPs/HCNS modified glassy carbon electrode (GCE) are much higher than those on the AuNPs/HCNS/GCE and bare GCE. The β-CD-AuNPs/HCNS/GCE has a linear response range of 4.79–958.00 μg L−1 with a detection limit of 0.96 μg L−1 for RhB.
研究领域:
分析化学
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食品安全
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2015
·
IF 2.252
Kuiwen Shen,Fen Ran,Xuanxuan Zhang,Chang Liu,Naijie Wang,Xiaoqin Niu,Ying Liu,Dingjun Zhang,Lingbin Kong,Long Kang,Shaowei Chen
Nano-polyaniline (nano-PANI) was deposited on hollow carbon spheres (HCS) to prepare nano-PANI/HCS composites via in-situ chemical polymerization. The composites combined the high pseudocapacitance of nano-PANI and the excellent porous structure of HCS which were prepared by the carbonization of a cross-linked co-polymer, poly(styrene- co -divinylbenzene- co -methylacrylic acid). The structure and properties of the resulting composites were characterized by Fourier-transform infrared spectroscopy (FTIR) and nitrogen (N 2 ) adsorption measurements, and the electrochemical behaviors were examined in 1 M H 2 SO 4 aqueous solution. Morphology was studied by scanning electron microscopy (SEM) and transition electron microscopy (TEM). SEM and FTIR characterizations reveal that nano-PANI was successfully deposited on the surface of HCS; and electrochemical tests indicated that the nano-PANI/HCS composites exhibited a high specific capacitance of 435.0 F g −1 , along with good long-term cyclic stability (≈60% retention after 2000 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2016
·
IF 6.198
Chen Zhou,Sai Geng,Xiuwen Xu,Tihong Wang,Liqiang Zhang,Xiaojuan Tian,Fan Yang,Haitao Yang,Yongfeng Li
Hollow carbon nanospheres (HCNs) with tunable sizes have been successfully prepared by the calcination of hollow copolymer nanospheres. Our findings indicate that compared to the counterpart solid carbon particle , HCNs all achieve substantially enhanced microwave absorption, suggesting that hollow structure plays an important role during microwave absorption. Moreover, further investigation on the effect of different HCNs sizes upon microwave absorption has been conducted. It is found that HCNs with an outer diameter of ∼70 nm and inner diameter of ∼30 nm exhibit the champion EM absorption performance , a minimum reflection loss (RL) of −50.8 dB at 13.5 GHz with a thickness of 1.9 mm, along with the corresponding bandwidth of RL less than −10 dB (90% absorption) covering 4.8 GHz. Notably, such excellent microwave absorption performance, probably as a result of well-matched impedance together with multiple reflection induced by the distinctive hollow structure, demonstrates HCNs to be one of the most competitive carbon-based absorbers to date. More importantly, this study provides an effective strategy to tune the microwave performance via tailoring the sizes of HCNs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 24
·期 8
·1988-1997
·
IF 5.317
Shao-Zhong Zeng,Yuechao Yao,Lin Huang,Hongliang Wu,Biaolin Peng,Qi Zhang,Xiaohua Li,Liang Yu,Shiyu Liu,Wenxuan Tu,Tongbin Lan,Xierong Zeng,Jizhao Zou
Graphical Hollow carbon nanospheres (HCNs) with specific surface areas up to 2949 m 2 g -1 and pore volume up to 2.9 cm 3 g -1 were successfully synthesized from polyaniline-co-polypyrrole hollow nanospheres by carbonization and CO 2 activation. Owing to their large inner cavity and enclosed structure, HCNs are desirable carriers for encapsulating sulfur. Hollow carbon nanospheres (HCNs) with specific surface areas up to 2949 m 2 g −1 and pore volume up to 2.9 cm 3 g −1 were successfully synthesized from polyaniline-co-polypyrrole hollow nanospheres by carbonization and CO 2 activation. The cavity diameter and wall thickness of HCNs can be easily controlled by activation time. Owing to their large inner cavity and enclosed structure, HCNs are desirable carriers for encapsulating sulfur. To better understand the effects of pore characteristics and sulfur contents on the performances of lithium-sulfur batteries, three composites of HCNs and sulfur are prepared and studied in detail. The composites of HCNs with moderate specific surface areas and suitable sulfur content present a better performance. The first discharge capacity of this composite reaches 1401 mAh g −1 at 0.2 C. Even after 200 cycles, the discharge capacity remains at 626 mAh g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fulin Yang,Wei Qiao,Lice Yu,Shuli Wang,Ligang Feng
Hydrogen generation from methanol via methanol-assisted water splitting is a promising electrochemical energy conversion technology but still meets challenges in addressing the low intrinsic activity and easy poisoning problems of the conventional Pt catalysts. Herein, the support engineering modulated Pt by hierarchical MoSe 2 @mesoporous hollow carbon support was proposed to integrate some structural and catalytic advantages for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). Supporting engineering by layered MoSe 2 nanosheets confined in mesoporous hollow carbon spheres (MHCSs) is adopted to uniformly anchor Pt nanoparticles (Pt/MoSe 2 @MHCS), which effectively enhances the conductivity and prevents the layer-by-layer stacking of MoSe 2 ; Strong interaction and coupling ability between Pt and MoSe 2 and the resultant electronic structure regulation of the active centers could weaken the binding strength of CO* and H* intermediates during catalysis and strengthen the oxophilicity leading to improved MOR and HER kinetics. Specifically, Pt/MoSe 2 @MHCS shows a significantly improved MOR current density of 81.1 mA cm −2 , about 3.0 times that of the benchmark Pt/C catalyst. Meanwhile, it also exhibits the HER performance of 28 mV to achieve a kinetic current density of 10 mA cm −2 in methanol-contained electrolytes. When employed for overall methanol electrolysis, a lowered input voltage of 1.11 V can be obtained to drive the current density (10 mA cm −2 ) compared to that for water electrolysis (0.62 V vs. 1.73 V). The electrochemical properties of high activity, rapid catalytic kinetics, and good stability were also demonstrated due to the enhanced oxophilicity and high poisoning tolerance ability resulting from the MoSe 2 /carbon substrate-induced electron redistribution of Pt sites. This work reports a novel platform to address the catalysis challenges in hydrogen production via the methanol electrolysis technique.
研究领域:
材料科学
·
电化学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Pengchao Hou,Guangjian Xing,Leyuan Tian,Gang Zhang,Hao Wang,Chunna Yu,Yongliang Li,Zhenglong Wu
The development of high-performance adsorbents for water purification is of utmost importance. Herein, we report the construction of a 3D graphene hybrid aerogel integrated with hollow carbon spheres via a two-step synthetic strategy. The structure and morphology of the hollow carbon spheres/graphene aerogels (HCSs/GAs) were characterized using BET, XRD, FTIR, Raman, XPS, and FESEM. The HCSs/GAs monoliths with high surface area (356.1 m 2 g −1 ) were utilized as an effective adsorbent for the removal of methyl orange (MO) and rhodamine B (RhB) dyes, organic solvents and oils from aqueous solutions. The HCSs/GAs demonstrated remarkably broad-spectrum adsorption performance with a high capacity for MO (344.1 mg g −1 ) and RhB (441.5 mg g −1 ), and up to 58–108 times its own weight for oils/organic solvents. Furthermore, the HCSs/GAs showed a rapid adsorbing ratio and superior recycling stability for oils/organic solvents. The adsorption kinetics of the HCSs/GAs were investigated and were well-fitted by the pseudo-second-order kinetics model. The high performance of the HCSs/GAs is related to its interconnected 3D hierarchical porous framework, high surface area and large pore volume. Therefore, the HCSs/GAs are believed to be a promising adsorbent for wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）