NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 24
·9574-9582
·
IF 3.069
Jiamin Zhou,Gang Xu,Zewu Zhang,Hongyong Wang
The rational design and preparation of low-cost and high-performance electrocatalysts are critical for hydrogen production. Herein, a novel Cu2MoS4/MWCNT electrocatalyst was synthesized by utilizing a facile and environmentally friendly solvothermal method. The as-obtained Cu2MoS4/MWCNTs could act as a high-efficiency electrocatalyst for hydrogen evolution reaction (HER) with a small Tafel slope of 48 mV dec−1 and a low overpotential of 247 mV at a current density of 10 mA cm−2. The high HER performance of Cu2MoS4/MWCNTs could be attributed to their large electrochemical surface area (ECSA), their unique conductive structure and the strong interfacial interaction between Cu2MoS4 and MWCNTs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2024
·
IF 4.6
John Texter,Qi Li,Feng Yan
Electrospinning of nanocarbons such as graphene and carbon nanotubes typically produces mats composed of one-dimensional fibers where the carrier polymer encapsulates the nanocarbons. Recently it was found that decreasing the amount of carrier polymer in approaching the electrospinning-electrospray boundary for graphene suspensions resulted in retention of the graphene two-dimensional anisotropy with one-dimensional carrier polymer fibers connecting flakes. We explored a similar decrease in carrier polymer in MWCNT suspensions to investigate the network topology that might ensue. Unexpectedly, two-dimensional leaflet meso-networks were obtained wherein the leaflets comprise laterally aligned MWCNTs one to several nanotubes thick. A mechanism based on capillary force-driven MWCNT self-assembly activated by menisci formed during drying of electrospun fibers is presented. Such materials offer new approaches to producing high surface-area coatings for catalytic and energy applications and suggest ways of formulating two-dimensional MWCNT assemblies in metal foams and other open-cell porous materials.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 7
·1-10
·
IF 2.02
Sun Xiaogang,Cai Manyuan,Chen Long,Qiu Zhiwen,Liu Zhenghong
A flexible composite paper of multi-walled carbon nanotube (MWCNT) and cellulose fiber (CF) were fabricated by traditional paper-making method. Then, the MWCNT/CF papers were carbonized at high temperature in vacuum to remove organic component. The carbonized MWCNT/CF (MWCNT/CCF) papers are consisted of MWCNT and carbon fiber. The papers were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and four-point probe resistance meter. The electrochemical performances of the supercapacitors were tested by cyclic voltammetry and galvanostatic charge/discharge >with 1 moL/L LiPF 6 as electrolyte. The MWCNT/CCF electrode yielded a specific capacitance of 156F/g at a current density of 50 mA/g by galvanostatic charge/discharge measurement, which is 1.29 times higher than MWCNT/CF electrode of 68F/g. The MWCNT/CCF electrodes also displayed an excellent specific capacitance retention of 84% after 2000 continuous charge/discharge cycles at a current density of 400 mA/g. The increase of specific capacitance can be attributed to enhanced electrical conductivity of MWCNT/CCF papers and improved contact interface between electrolyte and electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Shilong Gu,Xiang Sun,Xuwang Ye,Junhao Yang,Ye Liu,Ying Bai,Chaofeng Chen,Ming Yang,Luoxin Wang,Shiwen Yang
High-transparent material plays a pivotal role in optical engineering, yet faces practical challenges such as susceptibility to abrasion and ultraviolet degradation. To address these issues, we propose a simple approach for obtaining a multifunctional transparent polymethyl methacrylate. In this study, MWCNT@Fe 3 O 4 was utilized as a hybrid core covalently bonded to a silane coupling agent, which was subsequently ion-exchanged with a surfactant to yield monodisperse MWCNT@Fe 3 O 4 nanofluids. These nanofluids were then blended with polymethyl methacrylate through a simple casting process, resulting in a transparent composite material with good transparency (over 85 %), low friction (coefficient of friction < 3), UV resistance (UV absorption up to 73.35 %), and antistatic properties. The MWCNT@Fe 3 O 4 nanofluids combine the benefits of liquid and solid lubricants by reducing the friction coefficient and enhancing the wear resistance of the composite material. Moreover, the fluidity of MWCNT@Fe 3 O 4 nanofluids forms an anti-friction layer during friction, thereby improving the overall anti-friction properties of the composite material. Additionally, the hybrid core enhances the anti-ultraviolet performance of the composite film while the long chain lubricating layer improves its antistatic and antifouling capabilities. By incorporating MWCNT@Fe 3 O 4 nanofluids as a filler, we have developed multifunctional transparent polymethyl methacrylate material that holds promise for advanced applications.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 15
·期 1
·6
·
IF 4.4
Chuanxin Weng,Junzhe He,Jiangxiao Tian,Wei Wu,Jinjin Li,Jiulin Zhang,Haitao Yu,Xuechuan Zhang,Mingming Lu
The disordered assembly and low conductivity of carbon nanotubes are the main problems that limit the application of electromagnetic interference (EMI) shielding. In this work, an ordered lamellar assembly structure of multiwalled carbon nanotube/Ti3C2Tx(MWCNT/Ti3C2Tx) hybrid films was achieved by vacuum-assisted filtration through the hybridization of Ti3C2Txnanosheets and carbon nanotubes, where carbon nanotubes were tightly sticking on the surface of Ti3C2Txnanosheets via physical adsorption and hydrogen bonding. Compared with the pure carbon nanotubes films, the hybrid MWCNT/Ti3C2Txfilms achieved a significant improvement in conductivity of 452.5 S/cm and EMI shielding effectiveness (SE) of 44.3 dB under 50 wt% Ti3C2Txwith a low thickness (8.6 μm) and orderly lamellar stacking structure, which finally resulted in high specific SE (SSE/t, SE divided by the density and thickness) of 55,603.1 dB∙cm2∙g−1.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yuqiao Zhou,Hengfeng Li
In the realm of electromagnetic wave absorption materials, achieving a combination of broad absorption bandwidth, high absorption intensity, and practical versatility presents both a scientific challenge and an engineering necessity. This study introduces a lightweight, high compressibility poly(methacrylimide) (PMI) composite foam with enhanced electromagnetic wave absorption properties. The multiwalled carbon nanotubes (MWCNT) and PMI were composited by ultraviolet (UV) photoinitiation prepolymerization, afterward combining the copolymerization curable-hot air method to prepare MWCNT/PMI composite foam. The resulting MWCNT/PMI composite foam with a minimal MWCNT content of less than 4.0 wt % exhibits a remarkable reflection loss of −55.0 dB and an extensive effective absorption bandwidth of 16.0 GHz within the 2–18 GHz range, attributable to its optimized porous structure and elevated dielectric loss. The complete frequency range of 2–18 GHz can be efficiently absorbed by MWCNT/PMI composite foam, making it ideal for broadband wave absorption. Additionally, composite foams all satisfy the requirements for lightweight design and high strength of microwave-absorbing materials due to its lightweight, good compressive strength, and heat resistance, making it more competitive in engineering applications.
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 SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Tianle Ge,Jiangfeng Mou,Rui Chen,Yuping Li,Kaizhao Wang,Yafei Wang,Kaijun Wang,Jin Hu,Tianyou Chen
Developing efficient and low-cost electrocatalysts is important for sustainable CO 2 utilization. Here, spherical Cu 11 In 9 alloy nanoparticles were synthesized on an MWCNT network via an impregnation-assisted reduction method. Electrochemical measurements in an H-type cell showed that Cu 11 In 9 @MWCNTs promoted CO 2 -to-CO conversion in 0.3 mol L −1 tetrabutylammonium chloride/acetonitrile (Bu 4 NCl/AN) electrolyte. At −2.4 V vs SHE, the Faradaic efficiency for CO (FE CO ) reached 95.8%, and the CO partial current density ( j CO ) approached 40 mA cm −2 . During 20 h of continuous electrolysis, the catalyst maintained approximately 95% CO selectivity and a stable current density. XPS and PDOS analyses indicated that Cu-In alloying modified the local electronic structures of Cu and In and shifted the d-band center of Cu away from the Fermi level. DFT calculations further showed more favorable CO 2 -to-CO energetics and less favorable H adsorption on Cu 11 In 9 than on Cu and In, consistent with the experimentally observed high CO selectivity and low H 2 formation. The MWCNT network maintained the dispersion and structural stability of the alloy nanoparticles, thereby increasing the exposure of accessible active sites and facilitating electrolyte contact and charge transport.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 20
·12427-12435
·
IF 4.036
Jin Zhang,Lu Tan,Hongxing Dong,Wenshan Qu,Jianguo Zhao
The surfactant-assisted preparation of carbon nanotube (CNT)/polymer composites has attracted the attention of scientists around the world. Here, CNT/epoxy nanocomposites were prepared using sodium carboxymethyl cellulose (CMC). The effect of CMC on the curing behaviors of epoxy resin (E44) and CNTs/E44 was studied using differential scanning calorimetry (DSC). The curing kinetics of the CMC/CNTs/E44 systems were examined using methods where the activation energy (E) is a constant and where E is a variable, respectively. The change of E with the conversion (α) was calculated using the Starink isoconversional method. For the E44 system, a significant variation of E was observed when the conversion increased from 0.05 to 0.95. The E variable method was introduced to this system to describe this phenomenon. In contrast to the method where E is a constant, the E variable method has better agreement with the experimental data. With these two methods, the curing kinetics of the CMC/CNTs/epoxy system can be understood comprehensively and accurately. Ultimately, the dynamic mechanical properties of neat E44, CMC/E44 and CMC/CNTs/E44 were investigated and compared, which showed that CMC/E44 had a higher storage modulus (Em) than the neat E44 and CMC/CNTs/E44 systems, and the CMC/CNTs/E44 system had a higher glass transition temperature (Tg) and damping factor (tan δ) than the neat E44 and CMC/E44 systems.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xuan Wan,Haohao Du,Du Tuo,Xiaoman Qi,Tianyu Wang,Jingtao Wu,Guangli Li
The excessive use of gatifloxacin (GAT) can seriously pollute the environment and damage human health. Therefore, reliable detection of its concentration is essential for environmental protection and physical health. Herein, an efficient and stable voltammetric sensor based on zirconium-based metal–organic framework/carboxylated multiwalled nanotube nanocomposites (UiO-66/MWCNT-COOH) was constructed for the determination of GAT. The morphologies, microstructures, and electrochemical properties of UiO-66/MWCNT-COOH were investigated by using various microscopic, spectroscopic, and electrochemical techniques. UiO-66/MWCNT-COOH showed good electrocatalytic activity for GAT oxidation with remarkable voltammetric response signals, which was primarily attributed to the synergistic effect from UiO-66 and MWCNT-COOH. Electrochemical kinetics studies revealed that the electrocatalytic oxidation of GAT is an irreversible and diffusion-limited reaction involving two protons and two electrons. The anodic peak current of GAT is linearly correlated with GAT concentration in the range from 0.05 to 10 μM with a low detection limit of 0.0075 μM. Moreover, UiO-66/MWCNT-COOH demonstrated high selectivity, reproducibility, and repeatability as well as extraordinary long-term stability (at least 7 weeks). The proposed UiO-66/MWCNT-COOH reliably detected trace GAT in the effluent, milk, human serum, and eye drops with satisfactory recoveries. Together with its outstanding merits such as low cost, robust response, short assay time, and good sensitivity, the proposed sensor shows enormous prospects for in situ determination of multiple antibiotics.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2017
·Vol. 2
·期 3
·1600282
·
IF 0
La Li,Zheng Lou,Wei Han,Di Chen,Kai Jiang,Guozhen Shen
Stretchable energy storage devices are required to fit for stretchable electronic devices, forming a fully stretchable system for comfortable and body-attachable electronic devices. Herein, highly stretchable micro-supercapacitors are fabricated by designing wave-shaped hybrid multiwalled carbon nanotubes/polyaniline electrodes. As-fabricated stretchable devices exhibit a large areal capacitance of 44.13 mF cm −2 and offer a power density of 0.07 mW cm −2 at an area energy density of 0.004 mW h cm −2 . Owing to the designed wavy electrode structure, the electrochemical performances of the stretchable micro-supercapacitors are almost invariably under different stretching stations ranging from 5% to 40%. By fabricating stretchable micro-supercapacitors arrays, a red light-emitting diode can be easily lighted under different conditions including stretching, twisting, crimping, and winding. All these results confirm the outstanding stability and mechanical strength of stretchable micro-supercapacitors, demonstrating its potential application in skin-patchable electronics or portable/wearable devices.
研究领域:
储能技术
·
柔性电子学
·
材料科学
·
纳米技术
✓ 已验证
DOI
IET Nanobiotechnology
·
2019
·Vol. 13
·期 6
·565-570
·
IF 1.925
Jiajia Li,Lijie Zhou,Xiangdong Jiang,Sicong Tan,Peng Chen,Huan Zhou,Zhaoyang Xu
Carbon aerogels have attracted considerable attention in basic research and for their potential applications in many fields. Here, the fabrication of a magnetic cellulose nanofibre (CNF)/poly(vinyl alcohol) (PVA)/multiwalled carbon nanotubes (MWCNT) carbon aerogel (m-CPMCA) is reported using a simple freeze-drying followed by a carbonisation process, and direct immobilisation of Fe 3 O 4 nanoparticle on the surface of aerogels. The obtained target aerogel has the characteristics of low density (0.098 g/cm 3 ), high porosity (>90%) and 3D interpenetrating porous structures. Furthermore, m-CPMCA has a surprising compressive strength (about 0.35 MPa) which is obviously higher than many other cellulose-based carbon aerogels. After Carbonization, m-CPMCA exhibits superhydrophobicity, selective absorption for organic solvents and fire-resistance. The m-CPMCA also exhibited a magnetic response and can absorb oil on the water surface and can be actuated by a small magnet. More importantly, the m-CPMCA could be recycled many times by combustion, which showed economic significance. To sum up, the authors believe that m-CPMCA will become a very potential adsorbent for dealing with the increasingly serious problem of organic pollution.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Jinye Zhang,Zepeng Lei,Shichang Luo,Yinghua Jin,Li Qiu,Wei Zhang
A novel conductive composite consisting of polyimine vitrimer matrix and multiwalled carbon nanotube (MWCNT) filler that allows bending, stretching, rehealing, and closed-loop recycling was developed. Such composites can be easily prepared by simply heating a mixed solution of the polyimine precursors and less than 10 wt % of MWCNTs. The resulting composites combine both advantages of the polyimine vitrimer (i.e., dynamic covalent bond exchange) and carbon nanotubes (i.e., electron conducting), and the as-fabricated thin films exhibit malleability, rehealability, recyclability and good electron conductivity. Impressively, the electrical conductivity of the composite could remain almost the same after bending, reshaping, rehealing, and reuse, thus making it an excellent candidate for flexible electronics. Moreover, such composites can also be fully recycled at the end of their service life, which would greatly reduce the electronic waste, manufacturing cost, and environmental impact.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）