JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Daile Zhang,Qiong Chen,Jianghua Zhang,Ting Sun
This work reports a composite material consisting of MgMn 2 O 4 particles and multi-walled carbon nanotubes (MWCNTs) for aqueous magnesium ion batteries (AMIBs), which is prepared with electrochemical conversion method. The electrochemical conversion method has the advantages of easy accessibility, mild condition and small structural failure of electrode material. The obtained MgMn 2 O 4 /MWCNTs displays good surface integrity and structure stability, which improves electrochemical performance. Simultaneously, MWCNTs network serves as the pathways of Mg 2+ ions and electrons not only shorts the ion migration path but also enlarges the interface of electrode/electrolyte. The MgMn 2 O 4 /MWCNTs exhibites the advantages of high conductivity, large charge-discharge capacity and good rate performance. The obtained MgMn 2 O 4 /MWCNTs shows a high discharge capacity of 412.9 mAh g −1 at 50 mA g −1 , which is close to two times of that for the MgMn 2 O 4 obtained by sol-gel method, and the capacity retention is 73.3% after 1000 cycles at 1000 mA g −1 . In addition, the MgMn 2 O 4 /MWCNTs//AC system is firstly assembled, which displays a specific discharge capacity of 94.5 mA h g −1 at 50 mA g −1 . Furthermore, the relevant electrochemical mechanism of Mg 2+ ion insertion/extraction can be explained by the change of manganese valence, which is investigated with ex-situ XRD and XPS measurements. This work expands the compound method of high-performance electrode material for rechargeable aqueous magnesium ion battery.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yilin Wang,Qian Fu,Jia Chen,Yueli Lin,Yaqi Yang,Chenxi Wang,Yixi Xie,Pengcheng Zhao,Junjie Fei
Catechol is a phenolic environmental pollutant that is highly toxic to living organisms and is released into the environment, where it is difficult to degrade in the ecosystem, thereby contaminating the environment and groundwater. Here, P(NIPAM-co-BMA)/BiPO 4 /BiOCl/MWCNTs nanocomposites were synthesized, and a temperature-controlled "on/off" electrochemical sensor was constructed. In addition, the P(NIPAM-co-BMA)/BiPO 4 /BiOCl/MWCNTs/GCE sensor shows good thermal sensitivity and electrochemical detection of catechol. Reproducible "on/off" switching on the CVs curve can be achieved by controlling the temperature of the solution. Under optimal conditions, the sensor was able to detect catechol in the linear range of 0.5–86.51 μM with a limit of detection of 0.2 μM (S/N = 3). Satisfactory results were obtained for the detection of natural environmental samples (tap water). In addition, the redox mechanism and electrochemical reaction sites of catechol were investigated by scanning rates. This work demonstrates for the first time the combination of temperature-sensitive polymers, bismuth-based compounds and multi-walled carbon nanotubes as electrochemical sensors for the detection of catechol, opening a new window for the sensitive detection of catechol. At the same time, the constructed switch-like electrochemical sensors can be better applied to different special scenarios.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Ruijie Liao,Xuhui Zhao,Mengran Liu
Flexible strain sensors are pivotal in human motion monitoring and flexible robotics. Achieving large strain response, high sensitivity, and stability, while the simplifying preparation process and reducing costs, is still a challenge. In this paper, we demonstrate a novel flexible strain sensor based on auxetic structure, fabricated through layer-by-layer self-assembling polyetherimide (PEI) and multi-wall carbon nanotubes (MWCNTs). Simulation analysis is conducted to explore the effect of the auxetic structure on the film strain, and then the flexible strain sensors are designed, fabricated, and examined. We find that the flexible strain sensors based on auxetic structures exhibit interlaced microcracks in both the transverse and longitudinal directions under strain, significantly amplifying the resistance changes. Thus, the sensors achieve a maximum strain coefficient of 499 (13 times of those unpatterned strain sensors), a fast response with a response time of 37 ms and relaxation time of 38 ms, and excellent stability exceeding 15,000 cycles. The sensors perform well in detecting throat vocalization and human limb movements, proving their prospects in human physiological signal detection and human health care.
研究领域:
材料科学
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生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Rui Liu,Xin Zhang,Ri-jia Liu,Yuan Sun,Bin-qiao Ren
In this study, we created a brand-new g-C 3 N 4 -MWCNTs/Ag/β-CD-MOF electrode that can be used as a platform for the electrochemical sensing of Rutin (RT). The g-C 3 N 4 -MWCNTs/Ag/β-CD-MOF composite was synthesized via calcination treatment and electrodeposition, coupled with hydrothermal reaction. This composite could appreciably enlarge the electrochemically active surface area of the as-prepared sensor to promote electron transfer and result in the enhanced response signals.With the assistance of differential pulse voltammetry (DPV) and cyclic voltammetry (CV), the electrochemical performance of sensor can be greatly enhanced. Under these optimum conditions, the designed electrochemical sensor was able to sense RT at the lower detection limit (LOD) of 0.69 nM (S/N = 3) with a wider range of 5–500 nM and showed high sensitivity of 1.97 μA . nM −1. cm −2 at room temperature. Additionally, the selective investigation on RT was performed with the related interfering molecules, and the g-C 3 N 4 -MWCNTs/Ag/β-CD-MOF/GCE showed decent stability and reproducibility. The real-time application of the modified electrode for RT detection was monitored in both pharmaceutical and serum samples with the satisfactory recovery. Overall, this research contributes to the field of the electroanalytical sensing and offers the potential applications in the drug monitoring.
研究领域:
分析化学
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药物监测
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2026
·Vol. 34
·期 5
·121
·
IF 5.6
Shan Chao,Liu Zhongying,Wu Shanshan,Qu Junjie,Mo Junhao,Sun Xiaoyi,Liu Chanjuan,Huang Xiaohua
In this work, polyethyleneimine (PEI)-functionalized multi-walled carbon nanotubes (PEI@MWCNTs) were synthesized by coating pristine MWCNTs with PEI. Subsequently, mixed matrix membranes (MMMs) containing various loadings of PEI@MWCNTs were fabricated by incorporating the aminated nanotubes into FFBA (a fluorinated copolyimide, synthesized from 6FDA, FPPAB, and BAMF) matrix. This modification strategy takes advantage of the low-diffusion-resistance tubular structure of MWCNTs to facilitate gas transport, while the abundant amino groups of PEI serve as active sites for CO 2 molecules. The PEI@MWCNTs/FFBA MMMs exhibited superior thermal stability compared with the pristine FFBA membrane. X-ray diffraction (XRD) analysis revealed that the incorporation of carbon nanotubes expanded the interchain spacing within the PI matrix, thereby increasing the free volume of the membrane. Gas permeation tests showed that, at a PEI@MWCNTs loading of 3 wt%, the CO 2 permeability increased by 74%, while the CO 2 /N 2 selectivity improved by 46%. These results indicate that the incorporation of PEI@MWCNTs enables simultaneous improvements in both gas permeability and selectivity, thus mitigating the conventional permeability–selectivity trade-off typically observed in polymer membranes. This work offers a novel and effective strategy to enhance interfacial interactions between dispersed nanomaterials and the PI matrix, showing great promise for practical gas separation applications.
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2020
·Vol. 27
·期 11
·3202-3212
·
IF 1.249
Guo Deng-ji,Pan Xu-dong,He Hu
Conductive polymer composites (CPCs) are widely used in the flexible strain sensors due to their simple fabrication process and controllable sensing properties. However, temperature has a significance impact on the strain sensing performance of CPCs. In this paper, the strain sensing characteristics of MWCNTs/PDMS composites under temperature loading were systematically studied. It was found that the sensitivity decreased with the increase of temperature and the phenomenon of shoulder peak also decreased. Based on the theory of polymer mechanics, it was found that temperature could affect the conductive network by changing the motion degree of PDMS molecular chain, resulting in the change of sensing characteristics. Finally, a mathematical model of the resistance against loading condition (strain and temperature), associated with the force-electrical equivalent relationship of composites, was established to discuss the experimental results as well as the sensing mechanism. The results presented in this paper was believed helpful for the further application of strain sensors in different temperature conditions.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Shujun Lv,Shuaihao Wang,Jie Zheng,Xuejiao Sun,Wenxiu He
The superior performance anode material has been the foremost challenge of sodium-ion batteries (SIBs). In this study, we report a facile strategy to synthesis TiO 2 /multi-walled carbon nanotubes (MWCNTs) composite through sol–gel methods. TiO 2 coupled with multi-walled carbon nanotubes (MWCNTs) increases the specific surface area and provides rich interfaces, which is conducting shuttle and transfer of Na + in the system; the carbon coating as a buffer layer can effectively inhibit the volume expansion during insertion/extraction of Na + process. When applied as anode material for SIBs, the as-prepared TiO 2 /MWCNTs delivers high reversible capacities of 226 mAh g −1 after 140 cycles at 0.1 A g −1 . The crystal structure and morphology of TiO 2 /MWCNTs materials were also characterized by XRD, TEM, and SEM.
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
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Hengrui Qiu,Shengli An,Xuejiao Sun,Huimin Yang,Yongqiang Zhang,Wenxiu He
Due to the unconventional properties of MWCNTs-GONRs (multiwalled carbon nanotubes-graphene oxide nanoribbons), we have tried to use it as a carbon resource for supercapacitors . MWCNTs-GONRs/Ni(OH) 2 electrode was obtained by hydrothermal method . Velvet α-Ni(OH) 2 was prepared above NF (nickel-foam) loaded with MWCNTs-GONRs. This layered design can effectively promote the diffusion of ions and increase the active site for MWCNTs-GONRs/Ni(OH) 2 electrode, thus enhancing the electrochemical performance. The electrode exhibits extraordinary electrochemical performances in electrochemical testing, such as supernal specific capacitance (1713.2 F g −1 ) and prominent working time. In addition, supercapacitors was assembled with MWCNTs-GONRs/Ni(OH) 2 and active carbon as materials. Which represents a prominent energy density (41.23 Wh kg −1 ), high power (6.80 kW kg −1 ) and prominent cycling stability property (95.18%, 3000 times). The electrode prepared in this work provides a clue to enlighten people for energy storage.
研究领域:
材料科学
·
能源存储技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 8
·3543-3551
·
IF 2.817
Zhang Chen,Wang Qing,Zhang Wanqi,Li Xiang,Zhu Zerui,Zhang Chenlei,Xie Aijuan,Luo Shiping
Co 3 O 4 -Ni-MOF composite was successfully prepared by solvent-thermal method and then was combined with acidified multi-walled carbon nanotubes (MWCNTs); the resulting Co 3 O 4 -Ni-MOF/MWCNTs hybrid was applied in supercapacitor and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM). The electrochemical tests including cyclic voltammetric (CV), galvanostatic charge and discharge (GCD), electrochemical impedance spectroscopy (EIS), and cycle life were also performed to investigate the supercapacitor properties of the as-prepared materials. The experimental results show that when the molar ratio of metal oxide material and Ni-MOF material is 1:1, Co 3 O 4 -Ni-MOF material displays better electrochemical performance. As the mass ratio of Co 3 O 4 -Ni-MOF and MWCNTs is 1:1, Co 3 O 4 -Ni-MOF/MWCNTs hybrid exhibits lower Rct value, higher cyclic capacitance stability, and better supercapacitor performance. Therefore, Co 3 O 4 -Ni-MOF/MWCNTs hybrid as an electrode material has a relatively ideal application prospect in terms of supercapacitor materials. Graphical abstract
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2021
·
IF 3.382
Yu Hao,Peng Li,Baohua Zhu,Yimin Zhang,Yuzong Gu
In order to modulate the nonlinear optical (NLO) properties of multi walled carbon nanotubes (MWCNTs) and make them applicable to ultrafast nonlinear optical devices, we fabricated a core satellite ZnS-Au nanostructure on the surface of MWCNTs via the solvothermal method. The structure and morphology of the MWCNTs-Au-ZnS product were characterized by means of the XRD, SEM and XPS, which showed that the ZnS-Au nanoassemblies were combined along with the MWCNTs through C S covalent bond and partial ionic bond. The optical nonlinearities of the MWCNTs-Au-ZnS system were investigated using the Z-scan technique under the excitation of 532 nm ps laser pulses and kinetically analyzed using the pump-probe transient absorption spectroscopy. The results showed that the saturation absorption (SA) coefficient and the third-order nonlinear susceptibility of the MWCNTs-Au-ZnS system were adjustable with the variation of the core-satellite structure. The intensity of the saturation absorption was tuned downward below that of the pure MWCNTs, while the susceptibility of the system was tuned upward above that of the pure MWCNTs, which were attributed to the combined action of two-photon absorption of ZnS, charge transfer in the system, trap states provided by Au and charge delocalization varying with the size. These tunable nonlinearities will expand the applications of the MWCNTs-Au-ZnS system in photonic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 12
·6583-6592
·
IF 4.626
Yin Qingqing,Xu Fen,Sun Lixian,Li Yaying,Liao Lumin,Wang Tao,Guan Yanxun,Xia Yongpeng,Zhang Chenchen,Wei Sheng,Zhang Huanzhi,Li Bin
Polyethylene glycol (PEG) is widely used as phase change materials (PCMs). However, the leakage and low thermal conductivity issues restrict its practical application. Herein, a series of novel MWCNTs/HPC/PEG PCMs (named as PCM MHP ) have been synthesized by hydroxypropyl cellulose grafting onto PEG for the first time and doping multi-walled carbon nanotubes (MWCNTs). The results indicate that the PCM MHP exhibit excellent shape stability and without leakage keeping warm for an hour at 353.2 K. The melting and freezing enthalpy of the PCM M1HP7 is 134.7 J g −1 and 131.2 J g −1 , respectively; and corresponding melting point and crystallization temperature are about 324.9 K and 308.8 K, respectively. The PCM MHP show a good reversible thermal stability after 100 heating/cooling cycles. In addition, adding 4 mass% MWCNTs, the PCM M4HP7 possess a higher thermal conductivity of 0.6019 W m −1 K −1 , which is 2.1 times that of the PCM HP without MWCNTs (0.2895 W m −1 K −1 ) and 1.9 times that of pure PEG (0.3228 W m −1 K −1 ). In a word, the fabricated PCM MHP is a kind of shape-stabilized PCM and has good latent ability. It will have a broad potential application in thermal energy storage applications.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 5
·51573
·
IF 3.125
Jiayun Shi,Taishan Wang,Jie Han,Yao Liang,Yujia Tong,Weixing Li
A novel SA-f-MWCNTs/PAN composite membrane, sodium alginate- functionalized multi-walled carbon nanotubes/polyacrylonitrile, was prepared to enhance the esterification conversion rate with a pervaporation membrane reactor. The SA-f-MWCNTs/PAN membrane was investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope. The hydrophilicity, mechanical properties, and separation performance of the composite membrane have been significantly improved. The flux of the composite membrane was 4374 g·m −2 ·h −1 , and the separation factor was 1249 (the water content in the feed was 10 wt%, at 75°C). The composite membrane the trade-off effect between flux and separation factor. The acid conversion rate of SA-f-MWCNTs/PAN membrane was up to 98.3% in 5 h at 75°C, which was a great increase of 18.3% compared with the equilibrium conversion rate of the batch reactor. In addition, SA-f-MWCNTs/PAN membrane exhibited good swelling resistance and reusability. The conversion rate of acetic acid was stable above 95.0% after 8 repetitive tests.
研究领域:
材料科学
·
化学工程
✓ 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）