ChemElectroChem
·
2018
·Vol. 5
·期 23
·3708-3716
·
IF 4.446
Nanxiang Feng,Kaixiong Xiang,Li Xiao,Wenhao Chen,Yirong Zhu,Han Chen
Li 1.1 V 0.9 O 2 /C microspheres with isomeric core-shell structure were synthesized by a rapid cooling and subsequent evaporative assembly approach. The prepared Li 1.1 V 0.9 O 2 /C microspheres were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) including elemental mapping analysis, and transmission electron microscopy (TEM). The core-shell Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. Amorphous carbon nanodots are uniformly dispersed in the crystalline Li 1.1 V 0.9 O 2 matrix in the core. In the shell however, Li 1.1 V 0.9 O 2 nanoparticles are embedded in an amorphous carbon network. The Li 1.1 V 0.9 O 2 /C microspheres are tested as active material for anodes in lithium-ion batteries, and exhibit an excellent reversible capacity of 295 mAh g −1 , high capacity retention of 98 % after 100 cycles at 0.2 C and 95 % after 500 cycles at 2 C rate, and deliver wonderful rate capability of 250 mAh g −1 at 5 C. Thus, the Li 1.1 V 0.9 O 2 /C microspheres with isomeric core-shell structure are promising candidates as anode material for commercial lithium-ion batteries. Graphical In a nutshell : Li 1.1 V 0.9 O 2 /C microspheres are synthesized as anode material for lithium-ion batteries. The Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. As anodes in lithium-ion batteries, the microspheres exhibit excellent overall electrochemical performance, rendering this material as promising candidate for the use in commercial lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Juan Li,Qiang Ru,Shejun Hu,Dawei Sun,Beibei Zhang,Xianhua Hou
A novel multi-step design of spherical nano-SnSb/MCMB/carbon core–shell composite for high stability and long life lithium battery electrodes has been introduced. The core–shell composite was successfully synthesized via co-precipitation and subsequent pyrolysis . The resultant composite sphere consisted of nanosized SnSb alloy and mesophase carbon microbeads (MCMB, 10 μm) embedded in a carbon matrix pyrolyzed from glucose and petroleum pitch, in which the MCMB was treated to be the inner core to offer mechanical support and efficient electron conducting pathway. The composite material exhibited a unique stability with a retention discharge capacity rate of 83.52% with reversible capacity of 422.5 mAh g −1 after 100 cycles and a high initial coulombic efficiency of 83.53%. The enhanced electrochemical performance is attributed to the structural stability of the composite sphere during the charging–discharging process.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
复合材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 118
·97435-97445
·
IF 3.84
Yuling Cai,Liuchun Zheng,Zhanqiang Fang
To reduce costs and improve practicability, an ion imprinted magnetic chitosan (IMCS) was synthesized through co-precipitation using steel pickling waste liquor and chitosan and Cu(II) as template ions, which was then characterized by TEM, SEM, EDX, FTIR, XRD and VSM. The batch experiments were carried out for its potential application and high selectivity of Cu(II) removal, which were observed due to the paramagnetic properties and coordination reactions in the imprinted cavities. Kinetic studies revealed that the adsorption process followed a pseudo second-order model and the equilibrium data fit perfectly with the Langmuir isotherm model. The maximum adsorption capacity was 109.89 mg g−1. Negative values for ΔH0 and ΔG0 indicated an exothermic and spontaneous adsorption process. The adsorption process was found to be a chemical reaction and coordination complexes were formed between the metal ions and the groups of chitosan binding mainly in the “bridge model”. Moreover, 0.2 mol L−1 HCl solution was considered as the most appropriate eluent for regeneration. It showed a great performance in the experiments for practical copper wastewater and the process was considerably cost-effective.
研究领域:
环境化学
·
材料科学
·
污染控制工程
·
资源循环利用
·
吸附技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiujuan Zhao,Yangyang Luo,Peixin Tan,Mingxian Liu,Changren Zhou
A high-performance oil-water separation device that built by environment-friendly materials is a promising strategy to solve water pollution problem. In this study, we developed an oil-water separation system with chitin/halloysite nanotubes (C/HNTs) composites. C/HNTs were crosslinked by epichlorohydrin and freeze-dried, then a porous sponge was formed. The C/HNTs sponge was modified to be hydrophobic via immersing into bromohexadecane ethanol solution. The surface structure, mechanical properties, microstructure, oil absorption and oil-water separation ability of the C/HNTs sponge were investigated. The addition of HNTs significantly increased the compressive strength of chitin sponge without influence on porous structure . IR spectra indicated the successful coating of bromohexadecane on the C/HNTs sponge surface, which enabled the hydrophobicity and lipophilicity of this construct. The inside construct of the C/HNTs sponges were full of interconnected pores, and the pore size ranged from 250 to 500 μm. The absorption capability for various oil and grease were measured, including methylbenzene, sunflower seed oil , carbon dichloride, n-hexane, chloroform and acetone. It is found that the total amount of chloroform absorbed by a C/HNTs sponge was ~11.23 times of the sponge's weight, and the absorption for hexane was ~3.94 times of the sponge's weight. The sponge also exhibited an excellent oil-water separation ability with as high as 98.7% separation efficiency. All the results suggested that the chitin/HNTs sponges with improved mechanical property would have a great potential in oil-water separation.
研究领域:
材料科学
·
环境工程
·
高分子化学
·
纳米复合材料
·
分离技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Xiaoxia Ren,Shou-Dong Xu,Shibin Liu,Liang Chen,Ding Zhang,Li Qiu
Biomass wastes or biomass derived hard carbon materials with the advantages of green, as well as economic and high reversible capacity have became the promising anode materials for sodium ion batteries (SIBs). Despite this, the poor rate capability hinders their further development. Here, we synthesized lath-shaped hard carbon materials derived from peanut shells by a two-step approach, namely a hydrothermal pretreatment for different treatment time first, and then a carbonized process at 800 °C. Morphology and structural characterizations (SEM, XRD and Raman) prove the hydrothermal pretreatment has a great influence on morphology transformation, the layer spacing, as well as the defect concentration which can enhance the adsorption sites of Na + and shorten the transport route of sodium ions . The PSDHCs-4 (hydrothermal treatment for 4 h) electrode can deliver the highest reversible capacity of 256 ± 5 mAh g −1 , and show the best capacity retention of 97 ± 2% at the current rate of 0.1 C after 100 cycles. More importantly, PSDHCs-4 electrode shows the excellent rate performances with a reversible capacity of 261, 244, 206, 163, 125, and 100 mAh g −1 at the current rates of 0.1, 0.2, 0.5, 1.0, 2.0 and 5.0 C, respectively. These remarkable electrochemical properties indicate that PSDHCs-4 material should be a promising anode material for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
可持续能源
·
碳材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 9
·2573-2579
·
IF 2.234
Sun Dawei,An Bonan,Zhang Beibei,Ru Qiang,Hou Xianhua,Hu Shejun
SnSb/C core-shell powder has been successfully prepared by modified carbothermal reduction method. The shape, size, morphology, and electrochemical properties of the SnSb/C core-shell powder have been investigated. SnSb particles are completely encapsulated by amorphous carbon shell, and the surface of SnSb/C composite has been characterized with porous structure. The composite has a relatively high BET surface area of 253 m 2 g −1 . The composite exhibits relatively good capacity retention for 50 cycles at a constant current density of 100 mA g −1 and show excellent rate performance when the current ranges from 50 to 200 mA g −1 . The improvement of reversible capacity and cyclic performance is attributed to loose and amorphous surface structure which could buffer volume variations through cycle process.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2025
·
IF 1.9
Qirong Cai,Zhengkai Chen,Meng Li,Yifei Wang,Ying Wu,Yingjun Li,Dongxiao Ji,Xiaohong Qin
Aromatic textiles are a significant application of aromatherapy, and the durability and washability of such textiles are critical performance metrics. In this study, in situ embedded aromatic yarns were developed to enhance the longevity and wash resistance of the embedded fragrance. Electrospun nanofibers were employed as efficient carriers for aromatic agents, with ylang ylang oil (YYO) selected as the core material and chitosan (CS) as the wall material. The nanocapsules were prepared using ionic gelation to encapsulate the aromatic compound. The morphology, cross-linking, and thermal stability of the nanocapsules were characterized using scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The results indicate that cross-linking occurred between CS and sodium tripolyphosphate, YYO was effectively encapsulated within the nanocapsules, and the thermal stability was enhanced. These nanocapsules were then incorporated into nanofibers through electrospinning, which were subsequently deposited onto cotton webs, forming a novel aromatic yarn through further processing. The morphology, mechanical properties, and aromatic properties of the aromatic yarns were characterized. As a result, the nanofibers were coated inside the yarn, and the retention rate of YYO remained at 67.25% after 28 days. After 20 washing cycles, the YYO content in the aromatic yarn was 0.5 mg/g, indicating strong controlled-release performance and wash resistance. This study provides insights into the preparation of textiles with long-lasting aromatic properties and durability.
研究领域:
纺织科学
·
材料科学
·
香薰疗法
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Na Li,Changhong Wang,Tingzhen Li,Brendan Latimer,Zhen Liu,Zhenghua Tang
Bimetallic nanoparticles with core-shell structure usually demonstrate enhanced catalytic performance due to the lattice strain created between the core and the shell region. The Au@Ag core-shell nanoparticles with different Au-to-Ag molar ratios were firstly fabricated by a facile method under mild conditions, and the n(Au): n(Ag) = 1: 2 sample showed the best electrocatalytic activity toward oxygen reduction reaction (ORR), a key reaction which plays an important role in fuel cells and metal-air batteries. Subsequently, the Au@Ag nanoparticles of n(Au): n(Ag) = 1: 2 were loaded on carbon nanotubes to prepare nanocomposite catalysts with different metal mass ratios of 20% Au@Ag/CNTs, 30% Au@Ag/CNTs, 40% Au@Ag/CNTs, and 50% Au@Ag/CNTs. The characteristics of the as-synthesized nanocomposites were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) as well. The nanocomposites demonstrated effective electrocatalytic performance toward ORR. Electrochemical tests showed that the 30% Au@Ag/CNTs sample exhibited the highest activity among the series, in aspects of onset potential and kinetic current density. Furthermore, the sample of 30% Au@Ag/CNTs exhibited markedly higher long-term stability than Pt/C. The results clearly illustrate that the Au@Ag core-shell nanoparticles-based nanocomposites hold great potentials as efficient ORR catalysts for fuel cell applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiawei Long,Tianli Han,Yingyi Ding,Chaoquan Hu,Jinyun Liu
Biomimetic materials are receiving increasing attention as potential candidates for secondary battery systems owing to unique structures and properties. Here, we develop a biomimetic composite composing of sea anemone-shaped hollow SnO 2 in-situ co-coating with ZnCo 2 O 4 nanoparticles encapsulated by a carbon shell. The biomimetic SnO 2 @ZnCo 2 O 4 @C-based Li-ion battery anode shows a stable capacity of 700 mAh g −1 after 350 cycles, a Coulombic efficiency exceeding 99% and a repeatable rate-performance. Low reaction barriers and rapid diffusion kinetics of Li ions are verified by using galvanostatic intermittent titration technique analysis. Moreover, a full cell composing of a SnO 2 @ZnCo 2 O 4 @C anode and a LiCoO 2 cathode exhibits 520 mAh g −1 ; while working as a slurry battery anode, the sea anemone-shaped SnO 2 @ZnCo 2 O 4 @C also displays high capacity and Coulombic efficiency after 100 cycles. The high performances of the biomimetic composite when working at different battery systems enable it to be applicable broadly.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2011
·
IF 2.502
Kemin Wang,Ruixue Yin,Zi Tong,Qiang Yu,Jun Nie
A novel water-soluble chitosan derivative, glucosyloxyethyl acrylated chitosan was successfully synthesized by Michael addition reaction of chitosan with glucosyloxyethyl acrylate (GEA), and the obtained glyco-chitosan derivative was characterized by FT-IR, 1 H NMR, elemental analysis, XRD, TG, DSC and SEM. The FT-IR and 1 H NMR results showed that GEA residues were grafted onto the amino group of chitosan. The degree of substitution (DS) was calculated by elemental analysis. XRD data revealed that the introduced saccharide moieties decreased the crystalline structure of chitosan. TG and DSC results demonstrated that the glucosyloxyethyl acrylated chitosan was less thermal stable than chitosan. This efficient synthetic method provided an approach of preparing water-soluble glyco-chitosan derivatives. The obtained derivatives would show stronger specific affinity of lectin than chitosan thus would have potential applications in biomaterials.
研究领域:
生物材料
·
有机化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 12
·10302-10308
·
IF 9.5
Rahman Sami Ur,Song Yong-Hui,Ma Zhen-Yu,Tai Xiao-Lin,Zhu Bai-Sheng,Yin Yi-Chen,Feng Li-Zhe,Hao Jing-Ming,Ding Guan-Jie,Song Kuang-Hui,Hu Ya-Lan,Li Tieqiang,Xu Jixian,Yao Hong-Bin
Lead sulfide quantum dots (PbS QDs) are promising candidates for high-performance solar cells due to their tunable bandgaps and low-cost solution processing. However, low carrier mobility and numerous surface defects restrict the performance of the fabricated solar cells. Herein, we report the synthesis of novel PbS-perovskite core-shell QDs to solve the low carrier mobility problem of PbS QDs via a facile hot injection method. CsPbI 2 Br shell enabled strain-free epitaxial growth on the surface of PbS QDs because of 98% lattice match. Our results demonstrate a significant improvement in the photoluminescence and stability of the synthesized PbS-CsPbI 2 Br QDs upon shell formation, attributed to the effective suppression of surface defects by the epitaxial shell of CsPbI 2 Br. As a result, the obtained solar cell based on PbS-CsPbI 2 Br core-shell QD exhibits a power conversion efficiency (PCE) of 8.43%, two times higher than that of pristine PbS QDs. Overall, the construction of PbS-CsPbI 2 Br core-shell structures represent a promising strategy for advancing the performance of PbS QDs-based optoelectronic devices.
研究领域:
材料科学
·
太阳能电池技术
·
纳米科技
✓ 已验证
DOI
高影响因子
CARBON
·
2018
·
IF 7.082
Guoliang Liu,Zhiming Liu,Jinlei Li,Min Zeng,Zhiyun Li,Lin He,Fuwei Li
Development of heteroatom-doped porous carbon frameworks derived from renewable biomaterials is highly desirable. Here we report phytic acid-chitosan (PA-CS) hydrogel as a platform for facile preparation of N, P dual-doped porous carbon networks via direct pyrolysis . The hydrogel system shows great versatility towards incorporating graphene oxide or metal ions, providing a way to introduce graphene sheets or metal nanoparticles into carbon matrix as needed. After the incorporation of graphene, the obtained N, P dual-doped carbon/graphene (NPC/G) sample shows a large specific surface area (1824 m 2 g −1 ), with a mixed meso- and micro-pore volume of 1.04 cm 3 g −1 . Importantly, the NPC/G sample exhibits high activity towards electrochemical oxygen reduction reaction in both alkaline and acidic electrolyte, ensuring a high-performance air catalyst of primary zinc-air batteries. Hopefully, this work provides a new method for the preparation of porous carbon materials with desired properties for catalysis.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米催化
·
可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）