A New Way to Manufacture a Carbon Nanotubes Supercapacitor

2009 ◽  
Vol 79-82 ◽  
pp. 47-50
Author(s):  
Tung Feng Hsieh ◽  
Chia Chih Chuang ◽  
Ming Yang Liu ◽  
Yu Chuan Chou ◽  
Chi Min Shu
Keyword(s):  
Carbon Nanotubes ◽  
Specific Capacitance ◽  
Power Density ◽  
High Specific Capacitance ◽  
Utilization Efficiency ◽  
The Novel ◽  
Supercapacitor Electrode ◽  
Multi Walled Carbon Nanotubes ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes

A nanocomposite electrode of vertically aligned multi-walled carbon nanotubes (MWCNTs) on gold was fabricated to improve the specific capacitance and power density of the conventional supercapacitor. The novel supercapacitor built from MWCNTs and gold electrode showed a very high specific capacitance of 92.74 F/g using cyclic voltammetry (CV) at 10 mV/s, and 96.43 F/g was measured at 100 Hz. This nanocomposite electrode greatly enhanced the utilization efficiency of supercapacitor electrode material, low material cost and provided both high capacitance and power density. It was shown that the nanocomposite electrode based on vertically aligned carbon nanotube electrode had the characteristics of high specific capacitance.

Performance of Vanadium Oxide on Multi-Walled Carbon Nanotubes/Titanium Electrode for Supercapacitor Application

2011 ◽  
Vol 311-313 ◽  
pp. 414-418
Author(s):  
Ming Yang Liu ◽  
Tung Feng Hsieh ◽  
Chia Jung Hsieh ◽  
Chia Chih Chuang ◽  
Chi Min Shu
Keyword(s):  
Carbon Nanotubes ◽  
Vanadium Oxide ◽  
Composite Electrode ◽  
Utilization Efficiency ◽  
Composite Electrodes ◽  
Supercapacitor Electrode ◽  
Supercapacitor Application ◽  
Titanium Electrode ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Composite electrodes based on vertically aligned multi-walled carbon nanotubes (MWCNTs) coated with vanadium oxide (V2O5) have used in supercapacitors. The vanadium (V) oxide (V2O5) cathodically deposited on titanium collector in vanadium oxide solution. The novel supercapacitor performed by V2O5/MWCNTs/Ti electrode in 1.0 M HCl aqueous solution can reach a specific capacitance of 713.3 F/g at 10 mV/s, which is larger than that of MWCNTs/Ti. To characterize the V2O5/MWCNTs/Ti composite electrode, cyclic voltammetry and galvanostatic charge-discharge method were executed, and the morphology of the composite electrode was examined by scanning electron microscope. This nanocomposite electrode greatly enhanced the utilization efficiency of supercapacitor electrode material, low material cost and provided both high capacitance and power density.

Electrochemical Performance of Polypyrrole/Multi-Walled Carbon Nanotubes Composites for Supercapacitors Electrodes

2011 ◽  
Vol 399-401 ◽  
pp. 1415-1418
Author(s):  
Jing Li ◽  
Hua Qing Xie ◽  
Yang Li
Keyword(s):  
Carbon Nanotubes ◽  
Cyclic Voltammetry ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Electrical Energy ◽  
Energy Storage Devices ◽  
Multi Walled Carbon Nanotubes ◽  
The Stability ◽  
Walled Carbon Nanotubes

Nanocomposites supercapacitors electrodes are synthesized by homogeneously coating the nano-structured polypyrrole (PPy) on multi-walled carbon nanotubes (MWCNTs) via a facile electrochemical method. The capacitance properties of the composites are evaluated by cyclic voltammetry (CV) and galvanostatic charge/discharge techniques. The results show that the porous composites structure exhibit a remarkable specific capacitance of 674 F g-1 at a current density of 2 A g-1. Electrochemical experiments indicate that the high specific capacitance is associated with uniform PPy coating. Moreover, the composites present a nearly ideal rectangular shape of cyclic voltammetry characteristics. The stability of the composites electrode is also examined and only 10% capacitance decrease after 800 cycles. This technique provides a feasible solution for developing high-performance electrical energy storage devices.

scholarly journals PRELIMINARY STUDY OF ELECTROPHORETIC DEPOSITION OF VERTICALLY ALIGNED MWCNT ON METALLIC ELECTRODE

2012 ◽  
Vol 05 ◽  
pp. 704-711
Author(s):  
SIAVASH KHABAZIAN ◽  
SOHRAB SANJABI
Keyword(s):  
Carbon Nanotubes ◽  
Metallic Electrode ◽  
Aqueous Solvent ◽  
Multi Walled Carbon Nanotubes ◽  
Dc Electric Field ◽  
Ft Ir ◽  
Vertically Aligned ◽  
Preliminary Study ◽  
Walled Carbon Nanotubes ◽  
Scanning Electron

Multi-walled carbon nanotubes films formed randomly aligned laterally by electrophoresis. Multi-walled carbon nanotubes with lengths of about 10 μ was shortened and functionalized by a mixture of sulfuric and nitric acid. The functional groups on carbon nanotubes were elaborated by FT-IR. Chemically shortened MWCNTs disperse in organic and aqueous solvent and deposited on electrode vertically-aligned by applying a constant DC electric field. The alignment of MWCNTs was observed by scanning electron microscopy. It also the effect of various substrates on alignment of multi-walled carbon nanotubes was investigated.

Novel ionic bioartificial muscles based on ionically crosslinked multi-walled carbon nanotubes-mediated bacterial cellulose membranes and PEDOT:PSS electrodes

2021 ◽  
Author(s):  
Yaofeng Wang ◽  
Fan Wang ◽  
Yang Kong ◽  
Lei Wang ◽  
Qinchuan Li
Keyword(s):  
Carbon Nanotubes ◽  
Bacterial Cellulose ◽  
Specific Capacitance ◽  
High Performance ◽  
Low Cost ◽  
Actuation Voltage ◽  
Fast Response ◽  
Bending Deformation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Abstract High-performance bioartificial muscles with low-cost, large bending deformation, low actuation voltage, and fast response time have drawn extensive attention as the development of human-friendly electronics in recent years. Here, we report a high-performance ionic bioartificial muscle based on the bacterial cellulose (BC)/ionic liquid (IL)/multi-walled carbon nanotubes (MWCNT) nanocomposite membrane and PEDOT:PSS electrode. The developed ionic actuator exhibits excellent electro-chemo-mechanical properties, which are ascribed to its high ionic conductivity, large specific capacitance, and ionically crosslinked structure resulting from the strong ionic interaction and physical crosslinking among BC, IL, and MWCNT. In particular, the proposed BC-IL-MWCNT (0.10 wt%) nanocomposite exhibited significant increments of Young's modulus up to 75% and specific capacitance up to 77%, leading to 2.5 times larger bending deformation than that of the BC-IL actuator. More interestingly, bioinspired applications containing artificial soft robotic finger and grapple robot were successfully demonstrated based on high-performance BC-IL-MWCNT actuator with excellent sensitivity and controllability. Thus, the newly proposed BC-IL-MWCNT bioartificial muscle will offer a viable pathway for developing next-generation artificial muscles, soft robotics, wearable electronic products, flexible tactile devices, and biomedical instruments.

scholarly journals Conjugated polyelectrolyte nano field emission adlayers

2016 ◽  
Vol 1 (4) ◽  
pp. 304-312 ◽  
Author(s):  
M. T. Cole ◽  
R. J. Parmee ◽  
A. Kumar ◽  
C. M. Collins ◽  
M. H. Kang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electron Emission ◽  
Field Electron Emission ◽  
Conjugated Polyelectrolyte ◽  
Emission Performance ◽  
Field Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes

Here we report on a straightforward and rapid means of enhancing the field electron emission performance of nascent vertically aligned multi-walled carbon nanotubes by introducing a polar zwitterionic conjugated polyelectrolyte adlayer at the vacuum–emitter interface.

Effect of Ferrocene Catalyst and Hydrogen Feed on Microstructures of Vertically Aligned MWCNTs

2016 ◽  
Vol 701 ◽  
pp. 8-12
Author(s):  
Shazia Shukrullah ◽  
Norani Muti Mohamed ◽  
Maizatul Shima Shaharun ◽  
Muhammad Yasar
Keyword(s):  
Carbon Nanotubes ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Areal Density ◽  
Optimum Conditions ◽  
Catalyst Amount ◽  
Multi Walled Carbon Nanotubes ◽  
Cvd Growth ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes

This study investigated the effect of catalyst amount on chemical vapour deposition (CVD) growth of multi-walled carbon nanotubes (MWCNTs) with and without hydrogen feed. The ferrocene weight was varied from 100 mg to 200 mg for CNTs growth over Si/SiO2/Al2O3 substrate. Very few CNTs were seen in micrographs of the samples produced in the absence of the hydrogen feed. Most of the carbon atoms precipitated into amorphous carbon due to existence of inactive catalyst particles. However, CNT structures grown with hydrogen feed were more distinct; the nanotubes were thinner, straight and highly crystalline. MWCNTs arrays/forest length was also increased from 120 µm to 850 µm with hydrogen feed. An increase in catalyst weight significantly affected the diameter, crystallinity, alignment and growth of nanotubes. The lowest inner-shell spacing of 0.348 nm was obtained with 150 mg of ferrocene, which is an indication of growth of relatively pure CNTs. Under the optimum conditions, the areal density of the ferrocene particles was sufficiently increased to get required alignment and crystallinity of MWCNTs.

Comparing Field Emission Stability of Lithography-free, Modified Multi-walled Carbon Nanotubes

2009 ◽  
Vol 1204 ◽  
Author(s):  
Archana Pandey ◽  
Abhishek Prasad ◽  
Jason Moscatello ◽  
Yoke Khin Yap
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Methyl Methacrylate ◽  
Field Emission ◽  
Field Emission Properties ◽  
Emission Stability ◽  
Multi Walled Carbon Nanotubes ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes ◽  
Stable Field

AbstractField emission from carbon nanotubes (CNTs) has been known for more than a decade but there is no commercialized product available in the market. Apparently, we need to improve our basics understanding on stable field emission from CNTs. Here we compared the field emission properties of as grown vertically-aligned multi-walled carbon nanotubes (MWCNTs) to two types of modified MWCNTs: 1) Conical bundles of opened-tip MWCNTs, and 2) Opened-tip MWCNTs embedded in poly-methyl methacrylate (PMMA). We found that both types of modified MWCNTs have lower emission thresholds and better emission stability than the as grown samples. Among these modified samples, MCNTs embedded in PMMA has lower emission thresholds and better emission stability. We attributed these improvements to the filling of spacing between MWCNTs with PMMA that has higher dielectric constant than vacuum.

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