JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yin Wang,Qikui Man,Shiqi Zhu,Zhenkuang Lei,Guoguo Tan,Hongtao Guan
It’s a hurry to introduce a lightweight and high-efficiency microwave absorption material that is easy to synthesize, since the electromagnetic interference pollution is getting increasingly serious. Carbon-based microwave absorption material based on bimetallic metal-organic frameworks (MOFs) gets high conductivity and good magnetism at the same time, and thus can be regarded as an efficient microwave absorber with lightweight. Herein, we introduce an easy method to compose bimetallic carbon-based microwave absorbers based on ZIF-67. By changing the proportion of Fe 3+ and Co 2+ , not only the magnetism of the material can be adjusted, the amount of carbon nanotubes (CNTs) and so as the dielectric property of the material can also be regulated. The method of introducing precursors at room temperature and then calcinating at an Ar atmosphere is simple to repeat and appropriate for mass production. When the dosage molar ratio of Co 2+ : Fe 3+ is 3: 2, the minimum reflection loss ( RL min ) can reach − 24.83 dB while the effective absorption bandwidth (EAB) can reach 5.14 GHz when the thickness is 1.7 mm, under a 30 wt% filling loading. We believe that this work can provide a reliable method to introduce carbon-based microwave absorption material based on bimetallic MOF materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuhang Yang,Xian Zhang,Zhuang Cheng,Zihui Wen,Jiage Yu,Feng Wang,Yu Ding
Silicon possesses high theoretical specific capacity but suffers from huge volume expansion and poor electrical conductivity during cycling, resulting in significantly reduced capacity and poor cycling stability. These issues could greatly be alleviated by the encapsulation of silicon nanoparticles in carbon materials. Therefore, a three-dimensional (3D) network Si@CTS precursor was prepared in this work through in-situ encapsulation of silicon nanoparticles in stable hydrogel formed by crosslinking chitosan with glutaraldehyde as a cross-linking agent. After freeze-drying followed by oxidation stabilization at 280 ºC for 2 h under air and subsequent heat treatment at 800 ºC for 2 h under Ar atmosphere, uniformly distributed 3D Si@C composites were obtained. The effects of added amounts of carbon nanotubes (CNTs) on the structures and electrochemical properties of the as-obtained composites were investigated. The results showed uniformly distributed silicon nanoparticles in the amorphous carbon layer owing to the freeze-drying and oxidation treatments conducive to maintaining the skeleton structure of the material. The amorphous carbon and appropriate CNTs effectively buffered the volume changes, as well as improved the ionic and electronic conductivity. Si@C/CNTs-10% showed better comprehensive electrochemical performances at CNTs added amount of about 10 wt%. The discharge specific capacities at 0.1 A·g −1 after 150 cycles, as well as at 1.0 and 2.0 A·g −1 after 1000 cycles were estimated to 943.1, 461.3, and 123.1 mAh·g −1 , respectively.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hui Cheng,Guiying Xu,Chengyao Zhu,Zahrah Alhalili,Xuan Du,Guo Gao
Metal-organic frameworks (MOFs) materials and their derivatives have been widely used in the area of clean energy. When appropriate MOFs are selected for pyrolysis under suitable conditions, MO/C composites containing metal oxides (MO) and carbon layer can be obtained, and the skeletal structure of MOFs can also be maintained. In this contribution, porous double MOFs composites wrapped by carbon nanotubes (MIL-125/ZIF-8@CNTs) has been synthesized. After pyrolysis, the MIL-125 is transformed into TiO 2 /C, the ZIF-8 is converted into ZnO/C, multi-walled carbon nanotubes were wrapping on the surface of TiO 2 /ZnO/C, and finally formation of porous TiO 2 /ZnO/C@CNTs composites. Multi-walls CNTs could improve the electrical conductivity of the composites and increase the structural stability of the architectures, alleviating the volume expansion of materials during the charging/discharging process. The synthesized porous TiO 2 /ZnO/C@CNTs exhibits high specific capacity (the capacity is 816.8 mAhg −1 at the current density of 100 mAg −1 after 100 cycles) and excellent rate performance. Even at the high current density of 2 A g −1 after 300 cycles, the capacity still could reach up to 800 mA h g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Chunlong Dai,Minqiang Wang,Jingang Yang,Linyu Hu,Maowen Xu
A novel MnO@Amorphous C-Carbon nanotubes (MnO@C-CNTs) composite is prepared by chemical vapor deposition (CVD). When used as an anode material for Li-ion batteries, the MnO@C-CNTs composite exhibits an initial discharge capacity of 1164 mA h g −1 at 100 mA g −1 and the discharge capacity gradually increased from 571.7 mA h g −1 to 654 mA h g −1 after 100 cycles at 1 A g −1 , which shows an increase of the capacity rather than attenuation. Furthermore, the MnO@C-CNTs electrode can deliver a capacity of up to 228 mA h g −1 at 5 A g −1 . These results indicate that the three-dimensional conductive network of the MnO@C-CNTs composite could prevent the aggregation of MnO particles, and its open structure allows electrolyte penetration, and reduces the diffusion path of the lithium ions , hence maximizes utilization of the electrochemically active MnO particles, while enhances the conductivity of electrode material and Li + transport. This work offers a universal approach to design various metal oxides@C-CNTs composite.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 4
·1953-1962
·
IF 3.43
Wenyuan Duan,Mingshu Zhao,Yusuke Mizuta,Yanlin Li,Tong Xu,Fei Wang,Toshihiro Moriga,Xiaoping Song
Olivine LiFePO4 covered flocculent carbon layers wrapped with carbon nanotubes (CNTs) prepared by sol–gel method and calcination is used as the cathode material for aqueous rechargeable lithium-ion batteries (ARLBs). The phase structures and morphologies of the composite material are characterized by X-ray diffraction (XRD), selected area electron diffraction (SAED), and transmission electron microscopy (TEM). The mechanism and method through which CNTs and flocculent carbon improve the electrochemical performance are investigated in an aqueous lithium-ion battery by setting up a comparative experiment. The ARLB system is assembled using a LiFePO4/C/CNTs cathode and a zinc anode in 1 mol L−1 ZnSO4·7H2O and saturated LiNO3 aqueous solution (pH = 6), which can deliver a capacity of 158 mA h g−1 at a rate of 1C. Even at a rate of 50C, it still has a capacity of 110 mA h g−1 after 250 cycles with fantastic capacity retention (95.7%). The lithium-ion diffusion coefficient increases by an order of magnitude due to the addition of CNTs together with flocculent carbon. Four LEDs are successfully powered by the ARLBs for more than one minute to demonstrate the practical application. The excellent rate capabilities and thrilling discharge capacity at a high rate indicate that this cathode material possesses excellent electrochemical performance, and this ARLB system exhibits excellent potential as a power source for environmental applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Maoheng Fei,Zixun Huang,Caiyu Ge,Zhifang Liu,Jiejun Li,Xiang Ye,Yixi Xie,Pengcheng Zhao,Junjie Fei
The development of efficient and sensitive electrochemical sensors for caffeic acid (CA) detection is critical for food safety and human health monitoring. However, conventional metal-organic framework (MOF) derivatives often suffer from particle agglomeration and limited electrical conductivity. Herein, we propose a novel in-situ growth strategy to construct a core-shell Co-MoO 2 @C composite, which is further integrated with multi-walled carbon nanotubes (CNTs) to achieve a “dispersive-supportive-catalytic” trifunctional sensing platform. Specifically, ZIF-67 was grown in situ on MoO 3 nanorods to form a core-shell MoO 3 @ZIF-67 precursor. Upon pyrolysis, this unique structure effectively prevented the agglomeration of Co nanoparticles and generated abundant Co-Mo-O active sites and heterojunction interfaces. The subsequent incorporation of CNTs not only constructed a highly conductive network but also significantly increased the electroactive surface area (3.65 mm 2 ) and adsorption capacity (1.744 nM·cm −2 ) via synergistic effects. The limit of detection (LOD) of the Co-MoO 2 @C/CNTs/GCE sensor for CA was 8.4 × 10 −10 M under the most suitable conditions. This work provides a new paradigm for designing MOF-oxide‑carbon ternary composites for advanced electrochemical sensing applications.
研究领域:
电化学
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材料科学
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传感器与生物传感器
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纳米复合材料
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环境与食品分析
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Shengping Deng,Chongran Song,Shiyu Li,Ying Bai
NASICON-type Na 4 MnCr(PO 4 ) 3 (NMCP) has gained significant attention due to its prominent capacity and voltage platform. However, poor intrinsic electron conductivity severely obstructed its wider application. Here, the NMCP was decorated through structurally integrated with the high conductive carbon nanotubes (CNTs) component via the sol-gel method. The CNTs additive was tightly implanted NMCP bulk, providing fast electron transfer rates, further reduced charge transfer resistance and ohmic resistance , and improving the electrochemical properties of NMCP during the reversible intercalation/deintercalation of Na + . Finally, the as-prepared rambutan-like NMCP/C@CNTs could release a high reversible capability of 118.7 mAh g −1 at 0.1C and exhibit long durability over 500 cycles at a high rate of 10C. The pseudocapacitance contributions were investigated, and the Na storage mechanism was also demonstrated through in-situ synchrotron X-ray diffraction. The assembled NMCP/C@CNTs//HC full cell could deliver a high energy density of 364.4 Wh kg −1 . The encouraging electrochemical performance of the full cell will promote the development of sodium ion secondary batteries for large-scale applications in the future.
研究领域:
材料科学
·
电化学
·
储能
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shiqi Sun,Yanjun Chen,Jun Cheng,Zeyi Tian,Chao Wang,Guangping Wu,Changcheng Liu,Yanzhong Wang,Li Guo
Na 3 V 2 (PO 4 ) 3 (NVP) has gained enormous attentions due to the high capacity and voltage platform. Nevertheless, poor intrinsic electronic conductivities severely restrict the further development. Herein, a feasible strategy to construct unique dimensional gradient structure of the wolfram doped NVP is proposed via a facile sol–gel method. The introduction of W 6+ with the smaller ionic radius parallelized with local V 3+ ions could stabilize the open NASICON structure of NVP and generate vast of beneficial holes to accelerate the electronic transportation. Notably, the wolfram can combine with the superfluous carbon layer and form the new conductive WC phase to further promote the electronic conductivity. Meanwhile, the coated carbon layers and enwrapped CNTs construct an effective conductive framework for accelerated electronic migration. The twining CNTs promote to inhibit the growth of the sintered grains, reducing the particle size to provide shortened pathway for the migration of Na + . Distinctively, the modified Na 2.97 V 2.99 W 0.019 (PO 4 ) 3 /C@CNTs (W0.01-NVP) composite delivers a superior electrochemical performance. Significantly, it can submit a high reversible capability of 112.5 mAh g −1 at 5C with retaining 86% initial capacity over 500 cycles. As for a super high rate of 50C, it reveals an incredible capacity of 92.6 mAh g −1 and remains 84.5 mAh g −1 over 400 cycles, corresponding to a high retention of 91.30%. The superior electrochemical performance is derived from the enhanced crystal structure resulted from wolfram substitution and the beneficial dimensional conductive system consisting of new WC phase, coated carbon layers and enwrapped CNTs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米科技
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Bowen Li,Haidong Xie,Hui Tian,Haojie Xu,Kaiyi Chang,Li Zhang,Chang Li,Jiao Hou,Xinwei Wang,Beiping Wang,Hui Lu,Shaolin Yang,Chunping Hou
Silicon suboxides (SiO x ) are promising anodes for lithium-ion batteries, but their practical application is hindered by severe volume fluctuation and sluggish (de)lithiation kinetics. Herein, a hierarchical disproportionated-SiO x -based composite, D-SiO x @NC/C@CNTs/rGO-2, consisting of disproportionated SiO x (D-SiO x ) with in situ generated Si/SiO 2 domains, a nitrogen-doped carbon/carbon (NC/C) interphase, and an interconnected CNTs/rGO conductive framework, is constructed through thermal disproportionation, interphase engineering, and multidimensional conductive-network design. Thermal disproportionation induces the in situ formation of Si domains embedded in a SiO 2 buffering matrix, in which Si provides lithium-storage activity while SiO 2 alleviates volume variation and enhances structural stability. Meanwhile, a conformal nitrogen-doped carbon interphase mitigates chemo-mechanical stress and stabilizes the active interface, and the intertwined CNTs/rGO framework builds an efficient conductive network. As a result, the optimized anode delivers a reversible capacity of 876.4 mAh·g −1 after 500 cycles at 0.5 A g −1 , with a capacity retention of 83.7%, while electrode swelling is suppressed to ≈52% versus ≈159% for bare D-SiO x . Operando electrochemical impedance spectroscopy combined with distribution of relaxation times reveals reduced interfacial polarization and faster apparent Li + transport. A pre-lithiated LFP||D-SiO x @NC/C@CNTs/rGO-2 full cell also shows an initial Coulombic efficiency of 96.15% and stable cycling over 200 cycles.
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Hao Guo,Yong Hu,Xiaoping Zhang,Rongliang Zhang,Dong Hou,Yulei Sui,Ling Wu
In this paper, we report a facile one-step hydrothermal method to synthesize tetragonal Na3V2(PO4)2F3@C particles which are connected by carbon nanotubes (CNTs) networks, using water as hydrothermal solvents. In this strategy, the reduction and crystallization of materials are carried out in the hydrothermal process (180°C, 12 h), no additional heat treatment is required. The well-crystallized Na3V2(PO4)2F3 tetragonal grains (5–10 μm) are coated with amorphous nano-carbon and connected by highly conductive CNTs. The addition of CNTs can not only improve the conductivity of materials but also effectively inhibit the Na3V2(PO4)2F3 grains over growth. The Na3V2(PO4)2F3@C/CNTs composite possesses very flat charge/discharge platforms of 3.6 and 4.1 V. The sample exhibits an initial discharge specific capacity of 120.2 and 74.3 mAh g−1 at 0.1 and 10 C rate, respectively, and shows excellent cyclical stability. The composite owns excellent electrochemical performances owing to the three-dimensional highly conductive network which is co-constructed by the CNTs and nano-carbon coating layer.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Cheng Lin,Jilong Tang,Sizhuo Wang,Qun Gao,Yanlin Liu,Wei Wu,Xiaoli Wang,Zhenguo Huang,Limei Yang
Featuring low cost and high theoretical capacity, phosphorus-rich iron diphosphides (FeP 2 ) have emerged as excellent anode candidates for lithium-ion batteries. However, the typical chemical synthses involving high temperatures and toxic gases have restricted the mass production of FeP 2 . We now report a FeP 2 /C/CNTs@3D interconnected graphene aerogel composite synthesized by ball milling and low temperature heat treatment. Because of the unique microstructure and synergistic effect between well-dispersed FeP 2 particles and graphene aerogel , the as-prepared FeP 2 /C/ [email protected] % displays excellent lithium storage performance in terms of reversible capacity (886 mA h g −1 at 0.1 A g −1 ), cycling stability (476 mA h g −1 at 2 A g −1 even after 1000 cycles), and rate capability (685 mA h g −1 at 5 A g −1 ). Machine learning methods (decision tree and random forest algorithms) prove effective in evaluating and predicting electrochemical performance of the electrode materials.
研究领域:
材料科学
·
能源科学
·
机器学习
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2024
·Vol. 6
·期 4
·1108-1121
·
IF 17.2
Lu Tuo,Xu Nengneng,Guo Liyuan,Zhou Benji,Dai Lingyu,Yang Woochul,Liu Guicheng,Lee Joong Kee,Qiao Jinli
Rechargeable Zn–air batteries (ZABs) have received extensive attention, while their real applications are highly restricted by the slow kinetics of the oxygen reduction and oxygen evolution reactions (ORR/OER). Herein, we report a “bridge” structured flexible self-supporting bifunctional oxygen electrode (CNT@Co-CNF F50-900 ) with strong active and stable Co-N/C@pyridine N/C@CNTs reaction centers. Benefiting from the electron distribution optimization and the advantages of hierarchical catalytic design, the CNT@Co-CNF F50-900 electrode had superior ORR/OER activity with a small potential gap (ΔE) of 0.74 V. Reinforced by highly graphitized carbon and the “π–π” bond, the free-standing CNT@Co-CNF F50-900 electrode exhibited outstanding catalytic stability with only 36 mV attenuation. Impressively, the CNT@Co-CNF F50-900 -based liquid ZAB showed a high power density of 371 mW cm −2 , a high energy density of 894 Wh kg −1 , and a long cycling life of over 130 h. The assembled quasi-solid-state ZAB also demonstrated a high power density, attaining 81 mW cm −2 , with excellent charge–discharge durability beyond 100 h and extremely high flexibility under the multi-angle application. This study provides an effective electrospinning solution for integrating high-efficiency electrocatalysts and electrodes for energy storage and conversion devices. Graphical Abstract
研究领域:
材料科学
·
能源化学
✓ 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）