Structure and electrochemical characteristics of composites based on multi-walled carbon nanotubes and manganese oxide

2020 ◽  
Author(s):  
S. N. Nesov ◽  
P. M. Korusenko
Keyword(s):  
Carbon Nanotubes ◽  
Manganese Oxide ◽  
Electrochemical Characteristics ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Voltammetric Amitriptyline Determination Using a Metal-Free Electrode Based on Phosphorus-Doped Multi-Walled Carbon Nanotubes

2022 ◽  
Author(s):  
Chanakarn Sanguarnsak ◽  
Kiattisak Promsuwan ◽  
Jenjira Saichanapan ◽  
Asamee Soleh ◽  
Kasrin Saisahas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Electrochemical Sensing ◽  
Urine Samples ◽  
Electrochemical Characteristics ◽  
Sensing Element ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Phosphorus Doped

Abstract A new electrode material of phosphorus-doped multi-walled carbon nanotubes (P-MWCNTs) was developed as an electrochemical sensing element for amitriptyline (AMT). P-MWCNTs were hydrothermally synthesized and drop casted on a glassy carbon electrode (P-MWCNTs/GCE). The P-MWCNTs were morphologically, chemically and structurally characterized. The electrochemical characteristics of the P-MWCNTs/GCE were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and adsorptive stripping voltammetry (AdSV). The P-MWCNTs increased electron transfer at the GCE and the electrochemical conductivity of the electrode. Electrocatalytic activity toward the oxidation of AMT was excellent. In the optimal voltammetric condition, the P-MWCNTs/GCE produced linear ranges of 0.50 to 10 µg mL-1 and 10 to 40 µg mL-1. The limit of detection (LOD) and limit of quantification (LOQ) were 0.15 µg mL-1 (0.54 µM) and 0.52 µg mL-1 (1.80 µM), respectively. The developed sensor displayed good repeatability, reproducibility and specificity. The sensor successfully quantified AMT in pharmaceutical tablets, giving results consistent with spectrophotometric analysis. The sensor achieved recoveries from 98±2% to 101±5% from spiked urine samples. The proposed sensor could be applied to determine AMT in pharmaceutical and urine samples for forensic toxicology.

Improving the kinetics and surface stability of sodium manganese oxide cathode materials for sodium rechargeable batteries with Al2O3/MWCNT hybrid networks

2015 ◽  
Vol 3 (20) ◽  
pp. 10730-10737 ◽  
Author(s):  
Jun-Ho Park ◽  
Kwangjin Park ◽  
Ryoung-Hee Kim ◽  
Dong-Jin Yun ◽  
Seong-Yong Park ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Manganese Oxide ◽  
Cathode Materials ◽  
Rechargeable Batteries ◽  
Hybrid Networks ◽  
Surface Stability ◽  
Oxide Cathode ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The bonding nature of Na0.44MnO2 particle surfaces is tailored by introducing Al2O3 nanopowder and/or multi-walled carbon nanotubes (MWCNTs).

Electrochemical Characteristics of Platinum Nanocluster Catalysts Using Oxyfluorinated Carbon Nanotubes Supports

2007 ◽  
Vol 119 ◽  
pp. 155-158 ◽  
Author(s):  
Seok Kim ◽  
Mi Hwa Cho ◽  
Soo Han Kwon ◽  
Soo Jin Park
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Properties ◽  
Functional Groups ◽  
Treatment Temperature ◽  
Electrochemical Characteristics ◽  
Maximum Value ◽  
Different Temperatures ◽  
Multi Walled Carbon Nanotubes ◽  
Ft Ir ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWNTs) were oxyfluorinated at several different temperatures. The results indicated that graphitic carbon was the major carbon functional component on the MWNT surfaces and other functional groups, such as C–O, C=O, HO–C=O, C–Fx, were also present after oxyfluorination. The changes of surface properties of oxyfluorinated MWNTs were investigated using FT-IR, EDS and XRD. From the surface analysis, it was found that surface fluorine and oxygen contents increased with increasing oxyfluorination temperature and showed a maximum value at 100 °C. Consequently, it was found that optimal treatment temperature was 100 °C for the best electro activity of Pt/MWNT-100 catalyst and the oxyfluorinated Pt/MWNTs possessed the better electrochemical properties than the pristine Pt/MWNTs.

scholarly journals OBTAINING PARTIALLY UNZIPPED CARBON NANOTUBES FOR OXYGEN ELECTRODES

2019 ◽  
Vol 85 (11) ◽  
pp. 41-51
Author(s):  
Michail Danilov ◽  
Ihor Rusetskyi ◽  
Galina Dovbeshko ◽  
Andrii Nikolenko ◽  
Sergey Fomanyuk ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Anodic Oxidation ◽  
Electrode Materials ◽  
Hybrid Nanocomposites ◽  
Electrochemical Characteristics ◽  
Discharge Current Density ◽  
Oxygen Electrodes ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Electrochemical Anodic Oxidation

Various methods for unzipping carbon nanotubes are described, which differ only in the method of acting on multi-walled carbon nanotubes which leads to obtain a partial unzipped carbon nanotubes or the creation of a defective hybrid structure in carbon nanotubes. By electrochemical anodic oxidation in 80 % sulfuric acid of multi-walled carbon nanotubes synthesized partially unzipped nanotubes and shows the results of the study. Using the methods of X-ray phase analysis, electron microscopy, and Raman spectra, it has been established that, as a result of electrochemical anodic oxidation, partially unzipped multi-walled carbon nanotubes are obtained. Two-layer oxygen electrodes were made, where synthesized materials were used as an active layer. Studies of the electrocatalytic characteristics of oxygen electrodes from partially unzipped multi-walled carbon nanotubes were carried out in a mock up of fuel cell with alkaline electrolyte. It is established that the degree of unzipping of multi-walled carbon nanotubes depends on the time of electrochemical oxidation. It has been suggested that it is possible to control the process of synthesis of partially unzipped nanotubes. It has been established that one of the methods for estimating the degree of unzipping of multi-walled carbon nanotubes can be studies the electrochemical characteristics of oxygen electrodes based on these materials. Electrochemical investigation has established that the obtained samples of partially unzipped multi-walled carbon nanotubes are promising materials as catalysts carrier for oxygen electrodes of fuel cells. The developed method synthesis of partially unzipped multi-walled carbon nanotubes allows obtaining electrode materials for chemical current sources. Oxygen electrodes, based on such electrochemically produced materials, were stable for six months at a discharge current density of 200 mA/cm2. Partially unzipped multi-walled carbon nanotubes are promising catalyst carrier for electrodes of chemical current sources, as well as a material for hybrid nanocomposites with predetermined characteristics.

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