JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Xiaotian Wu,Shaodi Zheng,Yanhao Huang,Zewang Xu,Zhengying Liu,Wei Yang,Mingbo Yang
The carboxylic acid functionalized multi-walled carbon nanotubes/polyaniline nanotubes (PANI-NTs)/carboxylic acid functionalized single-walled carbon nanotubes electrodes for the flexible supercapacitors are fabricated by the layer-by-layer vacuum filtration. This strategy is aimed to assist powdery PANI-NTs to form a binder-free electrode, and meanwhile avoid sufficient contact between PANI-NTs and carbon nanotubes, ensuring abundant channels with a low tortuosity for enhanced electrolyte permeation and ion diffusion as well as large ion available surface area. Consequently, the assembled all-solid-state device achieves a high areal capacitance (258 mF cm −2 at current density of 0.5 mA cm −2 ), a superior energy density (3.82 m Wh cm −3 at a power density 33 mW cm −3 ) and favorable cycle stability (75.1% capacitance retention after 5000 cycles). Furthermore, the supercapacitor possesses outstanding flexibility and can be 180° bended up to 1000 times without loss of capacitance. Our works reveal that electrode structure design and fabrication procedures are also significant factors that greatly dominates electrochemical performance of supercapacitors.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanfang Shen,Jiannan Pan,Xinyue Hu,Hui-Min Wen,John Q. Xiao,Jun Hu
Nanowire arrays can be conveniently fabricated by electrodeposition methods using porous anodized alumina oxide templates. They have found applications in numerous fields. Nanotube arrays, with their hollow structure and much enhanced surface-to-volume ratio, as well as an additional tuning parameter in tube wall thickness, promise additional functions compared with nanowire arrays. Using a similar fabrication method, we have developed a facile and general method to fabricate metallic nanotubes (NTs). Using Ni NTs as a model system, the mechanism of the hydrogen-assisted NT growth was postulated and confirmed by controlling the hydrogen formation with conductive salts in an electrodeposition solution, which improves the H2 concentration but prevents the large H2 bubbles from blocking the nanochannel of a template. The controlled hydrogen generation forces the growth along the wall of nanochannels in the templates, leading to the NT formation. The magnetic properties can be controlled by the NT wall thickness, making these NTs useful for various applications.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 8
·1-12
·
IF 2.127
Dongmulati Naziermu,Baikeri Salamaiti,Maimaitiyiming Xieraili,Maimaiti Yumaierjiang
In this paper, we mainly studied the preparation of platinum-containing composite materials with carbon nanotubes wrapped by polypyrimidine-conjugated polymers and the performance of the composites. The polymer-based carbon nanotubes/Pt catalysts were prepared successfully and confirmed by infrared spectroscopy, XPS, XRD, and TEM images. The performance of polypyrimidine/multi-walled carbon nanotubes (MWCNTs)/Pt and polypyrimidine/double-walled carbon nanotubes (DWCNTs)/Pt was compared with the polypyrimidine/single-walled carbon nanotubes (SWCNTs)/Pt. The amount of the loaded Pt on the polypyrimidine/MWCNTs and polypyrimidine/DWCNTs was calculated to be 50.5 wt% and 52.7 wt% respectively. The effective specific surface area of the polypyrimidine/MWCNTs/Pt (45.7 m 2 /g) and polypyrimidine/DWCNTs/Pt (42.47 m 2 /g) was observed by electrochemical cyclic voltammetry. These studies strongly imply that the MWCNTs were better candidates than DWCNTs and SWCNTs in the application of polypyrimidine/CNT materials as catalyst for fuel cells.
研究领域:
材料科学
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催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Yuan-Mei Song,Ru-Quan Liang,Fei Wang,Dan-Hui Zhang,Liu Yang,Deng-Bo Zhang
The hydrate-based technology has been viewed as a great potential approach for the natural gas storage and transportation, whose commercialization however is challenged by the limited energy storage efficiency and slow formation kinetics. In this work, we used carbon nanotubes (CNTs) as carriers and covalently grafted functional group of -SO 3 - (similar to the hydrophilic group contained in sodium dodecyl sulfate) onto the nano-carriers surface to prepare a novel promoter, sulfonated carbon nanotubes (SCNTs). The SCNTs nanofluid showed higher dispersity and stability than the pristine CNTs (PCNTs). In the methane hydrate formations, the high methane storage capacity of 142 v/v in the SCNTs nanofluid was achieved, whereas 50–65 v/v was obtained with the oxidized CNTs (OCNTs) or PCNTs as promoter. Interestingly, the larger number of sulfonate groups grafted on CNTs, the shorter hydrate formation period and the smaller hydrate reaction stochasticity were obtained. The formation rate was enhanced from 0.237 mmol/(mol water·min) to 0.413 mmol/(mol water·min) when SCNTs concentration grew from 25 mg/L to 150 mg/L. Additionally, the SCNTs kept excellent recycling performance at ten reuses in the methane hydrate formations, which was meaningful to the actual hydrate-based gas storage and transportation.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yanghao Feng,Wendi Zhang,Kunpeng Tang,Yingzhi Chen,Huiju Cao,Yuan Hu,Weili Cui,Lei Shi,Guowei Yang
Single-walled carbon nanotubes (SWCNTs) serve as ideal templates for synthesizing inner tubes with engineered diameters, resulting in the formation of double-walled carbon nanotubes (DWCNTs). This approach enables the synthesis of confined carbyne (CC) with tailored properties through the newly formed inner tubes. The formation of CC primarily relies on carbon sources derived from the SWCNTs themselves via structure reconstruction under high-temperature annealing, leading to inherently low yield of CC due to insufficient carbon supply. To enhance the yield of CC, we explored the introduction of internal carbon sources, which are small enough to be inserted inside the SWCNTs, such as organic solvents or fullerene molecules; however, further improvements remain challenging. In this study, we demonstrate that incorporating external carbon sources via surfactants on the walls of SWCNTs significantly increases the yield of CC. The surfactants decompose at high temperatures, releasing carbon atoms that integrate into both the DWCNT structure and the CC; thus, the Raman intensity of CC increased by approximately 2.1 times compared to the empty counterpart. Moreover, combination of external surfactants and internal C 70 results in an ultrahigh Raman intensity of CC, exhibiting value approximately 30 times greater than that of the pristine SWCNTs. These findings underscore the potential of engineered both external and internal precursors to boost the synthesis of CC, benefiting their applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Jing Xiao,Hao Wang,Chunxiang Li,Keqin Deng,Xiaofang Li
High-quality tremella-like graphdiyne (GDY) nanotubes composed of intertwined ultrathin nanosheets were acidified. Shortened and acidified multi-walled carbon nanotubes (S-MWCNTs) were simply blended with GDY in a certain proportion to modify glassy carbon electrode (GCE). Electrochemical behavior of DA was studied on different modified electrodes . GDY showed high preconcentration to DA. S-MWCNTs facilitated the electron transport and promoted the oxidation of DA. Differential pulse voltammetry (DPV) was applied to determine low concentrations of DA. It exhibited a linear response in the concentration range of 0.02 to 20.0 μM with an estimated detection limit of 8.6 nM (S/N = 3). This sensor showed excellent performances for detection of DA in biological fluids.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2014
·
IF 1.761
Xiao Chi,Changbai Liu,Yu Li,Haiying Li,Li Liu,Xiaoqing Bo,Lili Liu,Chang Su
Pristine In 2 O 3 and ZnO–In 2 O 3 composited nanotubes were synthesized by the electrospinning technic and followed by calcination . The formation of ZnO–In 2 O 3 n–n heterojunctions was found to be highly sensitive to acetone gas. X-ray powder diffraction (XRD), Scanning electron microscope (SEM) and energy dispersive X-ray spectrometry (EDS) were respectively used to characterize surface crystallinity and morphology. The possible mechanism of nanotubes formation was also investigated. Gas sensors were made based on the as-synthesized materials to investigate their gas sensing properties. Compare with the pristine In 2 O 3 nanotubes, ZnO–In 2 O 3 composite nanotubes show the obviously improved of acetone sensitivity. The sensitivity of ZnO–In 2 O 3 composite nanotubes is about 43.2, which is about triple times larger than that of the pristine In 2 O 3 nanotubes to 60 ppm acetone at 280 °C. The response and recovery times of ZnO–In 2 O 3 nanotubes to 60 ppm acetone are about 5 and 25 s. In addition, ZnO–In 2 O 3 composite nanotubes sensor also possesses a good selectivity to acetone.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Junwen Hu,Xuefeng Li,Jinfeng Dong
In this work, a carbon nanotube (CNT)-based membrane [(4-((4-((11-ferroceneundecyl)oxy)phenyl)diazenyl)phenoxy)-diethylene triamine (FADETA)/polyethyleneimine (PEI)-decorated CNT membrane] with stimuli-switchable separation fluxes was developed. The multiwalled CNTs were modified by a pH-, light-, and redox stimuli-responsive surfactant FADETA initially, and then the FADETA-decorated CNTs were further cross-linked by PEI and finally coated on the polypropylene membrane. Interestingly, the particular membrane was successfully applied in emulsion systems to separate oil and water with high efficiency. First, the FADETA-/PEI-decorated CNT membrane showed highly porous microstructural characteristics owing to the overlapped and cross-linked CNTs as confirmed by the scanning electron microscopy observation. Then, it showed strong hydrophilicity to water in the air and high oleophobicity to oil underwater, thereby endowing the membrane with the potential to separate oil and water. Owing to the modified multiple stimuli-responsive FADETA on CNTs, the separation fluxes were stimuli-switchable, which could be adjusted reversibly by environmental factors including pH, light, and redox.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
CHEMOSPHERE
·
2016
·
IF 3.698
Hao Li,Nan Zheng,Ni Liang,Di Zhang,Min Wu,Bo Pan
Multi-walled carbon nanotubes (MC) were fluorinated by a solid-phase reaction method using polytetrafluoroethylene (PTFE). The surface alteration of carbon nanotubes after fluorination (MC-F) was confirmed based on surface elemental analysis, TEM and SEM. The incorporation of F on MC surface was discussed as F incorporation on carbon defects, replacement of carboxyl groups , as well as surface coating of PTFE. The adsorption performance and mechanisms of MC-F for five kinds of representative organic compounds: sulfamethoxazole (SMX), ofloxacin (OFL), norfloxacin (NOR), bisphenol a (BPA) and phenanthrene (PHE) were investigated. Although BET-N 2 surface area of the investigated CNTs decreased after fluorination, the adsorption of all five chemicals increased. Because of the glassification of MC-F surface coating during BET-N 2 surface area measurement, the accessible surface area of MC-F was underestimated. Desorption hysteresis was generally observed in all the sorption systems in this study, and the desorption hysteresis of MC-F were stronger than the pristine CNTs. The enhanced adsorption of MC-F may be attributed the pores generated on the coated PTFE and the dispersed CNT aggregates due to the increased electrostatic repulsion after fluorination. The rearrangement of the bundles or diffusion of the adsorbates in MC-F inner pores were the likely reason for the strong desorption hysteresis of MC-F. The butterfly structure of BPA resulted in its high sorption and strong desorption hysteresis. The exothermic sorption character of OFL on CNTs resulted in its strong desorption hysteresis.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2015
·
IF 5.75
Yue Liu,Benjamin W. Muir,Lynne J. Waddington,Tracey M. Hinton,Bradford A. Moffat,Xiaojuan Hao,Jieshan Qiu,Timothy C. Hughes
The use of medical imaging contrast agents may lead to improved patient prognosis by potentially enabling an earlier detection of diseases and therefore an earlier initiation of treatments. In this study, we fabricated superparamagnetic iron oxide (SPIO) nanoparticles within the inner cavity of multiwalled carbon nanotubes (MWCNTs) for the first time; thereby ensuring high mechanical stability of the nanoparticles. A simple, but effective, self-assembled coating with RAFT diblock copolymers ensured the SPIO-MWCNTs have a high dispersion stability under physiological conditions. In vivo acute tolerance testing in mice showed a high tolerance dose up to 100 mg kg–1. Most importantly, after administration of the material a 55% increase in tumor to liver contrast ratio was observed with in vivo MRI measurements compared to the preinjection image enhancing the detection of the tumor.
研究领域:
医学影像学
·
纳米医学
·
生物材料学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Wenhui Wu,Lite Yang,Faqiong Zhao,Baizhao Zeng
A highly selective electrochemical sensor was constructed for the detection of vanillin (VA). It was fabricated by molecular imprinting on the surface of polydopamine-functionalized multi-walled carbon nanotubes (MWNTs-PDA), followed by coating on a carboxyl single-walled carbon nanotubes modified electrode. The molecularly imprinted polymer was synthesized with 1-vinyl-3-octylimidazole hexafluoride phosphorus ([VOIm]PF 6 ) as monomer , VA as template and ethylene glycol dimethacrylate as cross-linker. The carboxyl single-walled carbon nanotube was introduced for improving conductivity and sensitivity. The sensor could recognize VA from its analogs and possible coexistent substances. The response peak current and VA concentration showed good linear relationship in the range of 0.2 μM–10 μM, with a sensitivity of 1.22 μA/μM mm 2 . The detection limit was 0.1 μM (S/N = 3). It was applied to the determination of VA in real samples with satisfactory results.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2016
·
IF 0.435
RUIZHUO OUYANG,WEIWEI LI,YANG YANG,WANGYAO ZHANG,KAI FENG,TIANYU ZONG,YARUI AN,SHUANG ZHOU,YUQING MIAO
We presented here three carbon-nanomaterials-based modified glassy carbon electrodes (GCE) with Ni–Ag nanohybrid nanoparticles (NPs) deposited upon, including single-wall carbon nanotubes (SWCNTs), multi-wall carbon nanotubes (MWCNTs) and the mesoporous carbons (MPCs), and compared their morphology effects on both Ni–Ag deposition quality and electrocatalytic performances toward Glu oxidation. After being deposited with Ni–Ag NPs, a homogenous surface with very small Ni–Ag NPs was obtained for Ni–Ag/SWCNTs/GCE, while heterogeneous, coarse surfaces with obvious embedment with large Ni–Ag particles were observed for both Ni–Ag/MWCNTs/GCE and Ni–Ag/MPC/GCE. All three modified electrodes were well characterized in terms of surface morphology, electron transfer rate, hydrophilicity, interference resistance, stability, electrocatalytic behaviors as well as practicability in real samples, based on which Ni–Ag/SWCNTs/GCE was always proved to be more advantageous over other two composite electrodes. Such advantage of Ni–Ag/SWCNTs/GCE was attributed to its desirable surface morphology good for Ni–Ag deposition and exposure of as many active sites as possible to Glu oxidation, leading to the extraordinary electrocatalytic performance.
研究领域:
电化学
·
材料科学
·
生物传感器
✓ 已验证
DOI
高影响因子
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