scholarly journals Investigation of the H2S poisoning process for sensing composite material based on carbon nanotubes and metal oxides

2016 ◽  
Vol 235 ◽  
pp. 213-221 ◽  
Author(s):  
Yichen Duan ◽  
Laurent Pirolli ◽  
Andrew V. Teplyakov
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
Metal Oxides ◽  
H2s Poisoning

Carbon Monoxide Sensing Technologies

2021 ◽  
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Carbon Monoxide ◽  
Metal Oxides ◽  
Electrochemical Sensors ◽  
Colorimetric Detection ◽  
Infrared Sensors ◽  
Polymeric Thin Films ◽  
Semiconducting Metal Oxides ◽  
Book Covers

The book covers the sensing and monitoring of poisonous carbon monoxide pollution in the environment. The sensors covered include semiconducting metal oxides, carbon nanotubes, conducting polymeric thin films, sensors based on colorimetric detection, non-dispersive infrared sensors, electrochemical sensors and photoacoustic detectors.

Effect of Expanded Temperature on Microstructure of Carbon Nanotubes/Expanded Graphite Composites

2013 ◽  
Vol 716 ◽  
pp. 373-378
Author(s):  
Qian Zhang ◽  
Xin Bao Gao ◽  
Tian Peng Li
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
High Temperature ◽  
Carbon Nanotube ◽  
Physical Adsorption ◽  
Expanded Graphite ◽  
Graphite Flake ◽  
Graphite Composite ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Carbon nanotube/expanded graphite composite material was prepared by expanding the mixture of multi-walled carbon nanotubes and expansible graphite under the condition of high temperature. The microstructure and composition was studied by using SEM and XRD. The study shows that the tubular structure of carbon nanotubes in the composite material is changed by high temperature expanding process, and the microstructure is different with different expanding temperature. When the expanding temperature was 900°C, carbon nanotubes transformed, then attached to the surface of expanded graphite flake, so carbon nanotubes and expanding graphite combined strongly; globular carbon nanotubes attached to the surface of expanded graphite flake at the temperature of 700°C, both were combined much more strongly; carbon nanotubes retained the tube structure at the temperature of 500°C, combination was looser due to the simple physical adsorption. The result shows that the choice of expanding temperature has an important effect on microstructure of carbon nanotube/expanded graphite composite material.

Chemically Coupled Cobalt Oxide Nanosheets Decorated onto the Surface of Multiwall Carbon Nanotubes for Favorable Oxygen Evolution Reaction

2021 ◽  
Vol 21 (4) ◽  
pp. 2660-2667
Author(s):  
Abdul Qayoom Mugheri ◽  
Aneela Tahira ◽  
Umair Aftab ◽  
Adeel Liaquat Bhatti ◽  
Ramesh Lal ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Electrochemical Impedance ◽  
Multiwall Carbon Nanotubes ◽  
Alkaline Media ◽  
Transfer Resistance ◽  
Multiwall Carbon

Cobalt oxide has been widely investigated among potential transition metal oxides for the electrochemical energy conversion, storage, and water splitting. However, they have inherently low electronic conductivity and high corrosive nature in alkaline media. Herein, we propose a promising and facile approach to improve the conductivity and charge transport of cobalt oxide Co3O4 through chemical coupling with well-dispersed multiwall carbon nanotubes (MWCNTs) during hydrothermal treatment. The morphology of prepared composite material consisting of nanosheets which are anchored on the MWCNTs as confirmed by scanning electron microscopy (SEM). A cubic crystalline system is exhibited by the cobalt oxide as confirmed by the X-ray diffraction study. The Co, O, and C are the only elements present in the composite material. FTIR study has indicated the successful coupling of cobalt oxide with MWCNTs. The chemically coupled cobalt oxide onto the surface of MWCNTs composite is found highly active towards oxygen evolution reaction (OER) with a low onset potential 1.44 V versus RHE, low overpotential 262 mV at 10 mAcm-2 and small Tafel slope 81 mV dec-1. For continuous operation of 40 hours during durability test, no decay in activity was recorded. Electrochemical impedance study further revealed a low charge transfer resistance of 70.64 Ohms for the composite material during the electrochemical reaction and which strongly favored OER kinetics. This work provides a simple, low cost, and smartly designing electrocatalysts via hydrothermal reaction for the catalysis and energy storage applications.

scholarly journals Facile synthesis of carbon nanotube-supported NiO//Fe2O3 for all-solid-state supercapacitors

2019 ◽  
Vol 10 ◽  
pp. 1923-1932 ◽  
Author(s):  
Shengming Zhang ◽  
Xuhui Wang ◽  
Yan Li ◽  
Xuemei Mu ◽  
Yaxiong Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Solid State ◽  
Metal Oxides ◽  
Reduction Method ◽  
High Capacity ◽  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth

We have successfully prepared iron oxide and nickel oxide on carbon nanotubes on carbon cloth for the use in supercapacitors via a simple aqueous reduction method. The obtained carbon cloth–carbon nanotube@metal oxide (CC-CNT@MO) three-dimensional structures combine the high specific capacitance and rich redox sites of metal oxides with the large specific area and high electrical conductivity of carbon nanotubes. The prepared CC-CNT@Fe2O3 anode reaches a high capacity of 226 mAh·g−1 at 2 A·g−1 with a capacitance retention of 40% at 40 A·g−1. The obtained CC-CNT@NiO cathode exhibits a high capacity of 527 mAh·g−1 at 2 A·g−1 and an excellent rate capability with a capacitance retention of 78% even at 40 A·g−1. The all-solid-state asymmetric supercapacitor fabricated with these two electrodes delivers a high energy density of 63.3 Wh·kg−1 at 1.6 kW·kg−1 and retains 83% of its initial capacitance after 5000 cycles. These results demonstrate that our simple aqueous reduction method to combine CNT and metal oxides reveals an exciting future in constructing high-performance supercapacitors.

The Real-Time Detecting Application of CNTs in 3D Braided Composite Material

2011 ◽  
Vol 301-303 ◽  
pp. 99-103
Author(s):  
Jian Min Guo
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
Real Time ◽  
Stress And Strain ◽  
The Real ◽  
Braided Composite

This paper pay attention to the Carbon Nanotubes Threads (CNTs) in the 3D Braided Composite Material . CNTs as a piezoelectricity sensor, can be braided in the 3D Braided Composite Material. The resistance of the sensor will be changed with the correspondent stress and strain on the 3D Braided Composite Material. The resistance of the Carbon Nanotubes Threads can be detected by computer. So, the stress and strain on the 3D Braided Composite Material can be obtained betimes.

A growth mechanism for carbon nanotubes using metal oxides as catalysts

2018 ◽  
Vol 50 (7) ◽  
pp. 734-743 ◽  
Author(s):  
Hassan Wahab ◽  
Mohamed M. El Gomati ◽  
Steven J. Hinder ◽  
John F. Watts
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxides ◽  
Growth Mechanism

Structural features and catalytic performance in CO preferential oxidation of CuO–CeO2 supported on multi-walled carbon nanotubes

2015 ◽  
Vol 5 (3) ◽  
pp. 1568-1579 ◽  
Author(s):  
Yuxian Gao ◽  
Kangmin Xie ◽  
Wendong Wang ◽  
Shiyang Mi ◽  
Ning Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxides ◽  
Catalytic Performance ◽  
Structural Features ◽  
Preferential Oxidation ◽  
Unusual Structure ◽  
Co Preferential Oxidation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

MWCNT supported CuO–CeO2 catalysts show enhanced performance in CO-PROX due to unusual structure features induced by interactions between metal oxides and MWCNT.

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