scholarly journals Electrochemical Analysis of Architecturally Enhanced LiFe0.5Mn0.5PO4 Multiwalled Carbon Nanotube Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Sabelo Sifuba ◽  
Shane Willenberg ◽  
Usisipho Feleni ◽  
Natasha Ross ◽  
Emmanuel Iwuoha
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Electrochemical Analysis ◽  
Multiwalled Carbon Nanotube ◽  
Spectroscopic Techniques ◽  
Redox Potentials ◽  
Multiwalled Carbon ◽  
Iron Manganese

In this work, the effect of carbon on the electrochemical properties of multiwalled carbon nanotube (MWCNT) functionalized lithium iron manganese phosphate was studied. In an attempt to provide insight into the structural and electronic properties of optimized electrode materials, a systematic study based on a combination of structural and spectroscopic techniques was conducted. The phosphor-olivine LiFe0.5Mn0.5PO4 was synthesized via a simple microwave synthesis using LiFePO4 and LiMnPO4 as precursors. Cyclic voltammetry was used to evaluate the electrochemical parameters (electron transfer and ionic diffusivity) of the LiFe0.5Mn0.5PO4 redox couples. The redox potentials show two separate distinct redox peaks that correspond to Mn2+/Mn3+ (4.1 V vs Li/Li+) and Fe2+/Fe3+ (3.5 V vs Li/Li+) due to interaction arrangement of Fe-O-Mn in the olivine lattice. The electrochemical impedance spectroscopy (EIS) results showed LiFe0.5Mn0.5PO4-MWCNTs have high conductivity with reduced charge resistance. This result demonstrates that MWCNTs stimulate faster electron transfer and stability for the LiFe0.5Mn0.5PO4 framework, which demonstrates to be favorable as a host material for Li+ ions.

scholarly journals Electrochemical Analysis of Architecturally Enhanced Life0.5Mn0.5PO4 Multi-Walled Carbon Nanotube Composite

2021 ◽  
Vol 66 ◽  
pp. 1-11
Author(s):  
Sabelo Sifuba ◽  
Shane Willenberg ◽  
Usisipho Feleni ◽  
Natasha Ross ◽  
Emmanuel Iwuoha
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Electrochemical Analysis ◽  
Spectroscopic Techniques ◽  
Redox Potentials ◽  
Manganese Phosphate ◽  
Multi Walled Carbon Nanotube ◽  
Iron Manganese

In this work, the effect of carbon on the electrochemical properties of multi-walled carbon nanotube (MWCNT) functionalized Lithium iron manganese phosphate was studied. In an attempt to provide insight into the structural and electronic properties of optimized electrode materials a systematic study based on a combination of structural and spectroscopic techniques. The phosphor-olivine LiFe0.5Mn0.5PO4, was synthesized via a simple microwave synthesis using LiFePO4 and LiMnPO4 as precursors. Cyclic voltammetry was used to evaluate the electrochemical parameters (electron transfer and ionic diffusivity) of the LiFe0.5Mn0.5PO4 redox couples. The redox potentials show two separate distinct redox peaks that correspond to Mn2+/Mn3+ (4.1 V vs Li/Li+) and Fe2+/Fe3+ (3.5 V vs Li/Li+) due to interaction arrangement of Fe-O-Mn in the olivine lattice. The electrochemical impedance spectroscopy (EIS) results showed LiFe0.5Mn0.5PO4-MWCNTs having high conductivity with reduced charge resistance. This result demonstrates that MWCNTs stimulates faster electron transfer and stability for the LiFe0.5Mn0.5PO4 framework, which demonstrates favorable as a host material for Li+ ions.

Reduced Graphene Oxide/Multiwalled Carbon Nanotube Composite Decorated with Fe3O4 Magnetic Nanoparticles for Electrochemical Determination of Hydrazine in Environmental Water

2020 ◽  
Vol 20 (5) ◽  
pp. 3148-3156 ◽  
Author(s):  
S. Nehru ◽  
Subramanian Sakthinathan ◽  
P. Tamizhdurai ◽  
Te-Wei Chiu ◽  
K. Shanthi
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Magnetic Nanoparticles ◽  
Reduced Graphene Oxide ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Reduced Graphene

In the present work, a reduced graphene oxide and multiwalled carbon nanotube (RGO/MWCNTFe3O4) composite decorated with Fe3O4 magnetic nanoparticles was prepared as an electrochemical sensor. The surface morphology of the prepared composite was identified by scanning electron microscopy and X-ray diffraction. The electrochemical properties of the GCE/RGO/MWCNT-Fe3O4 electrode were investigated by electrochemical impedance spectroscopy, cyclic voltammetry and amperometry. The GCE/RGO/MWCNT-Fe3O4 electrode exhibited higher electrocatalytic performance towards the oxidation of hydrazine. In the optimal conditions, the GCE/RGO/MWCNT-Fe3O4 electrode showed a wide linear range (0.15–220 μM), low limit of detection (LOD) (0.75 μM), and high sensitivity (2.868 μA μM−1 cm−2). The prepared GCE/RGO/MWCNT-Fe3O4 electrode also had excellent repeatability, selectivity, and reproducibility. The practical application of the electrode was confirmed with various spiked water samples and demonstrated acceptable recovery.

Fast Electron Transfer Kinetics on Multiwalled Carbon Nanotube Microbundle Electrodes

Nano Letters ◽  
2001 ◽  
Vol 1 (2) ◽  
pp. 87-91 ◽  
Author(s):  
J. M. Nugent ◽  
K. S. V. Santhanam ◽  
A. Rubio ◽  
P. M. Ajayan
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Fast Electron ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Electron Transfer Kinetics

Effects of multicopper oxidase orientation in multiwalled carbon nanotube biocathodes on direct electron transfer

2018 ◽  
Vol 66 (2) ◽  
pp. 137-141 ◽  
Author(s):  
Eiichiro Takamura ◽  
Takuto Nakamura ◽  
Hiroaki Sakamoto ◽  
Takenori Satomura ◽  
Haruhiko Sakuraba ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Direct Electron Transfer ◽  
Multicopper Oxidase ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon

scholarly journals BienzymaticAcetylcholinesteraseandCholine OxidaseImmobilized Biosensor Based on a Phenyl Carboxylic Acid-Grafted Multiwalled Carbon Nanotube

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
So-Ra Lee ◽  
Hyo-Eun Lee ◽  
Yun Ok Kang ◽  
Wan-Seok Hwang ◽  
Seong-Ho Choi
Keyword(s):  
Carbon Nanotube ◽  
Carboxylic Acid ◽  
Human Blood ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Electrochemical Polymerization ◽  
Choline Oxidase ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Human Blood Sample

Bienzymaticacetylcholinesterase(AChE) andcholine oxidase(ChOx) immobilized biosensor based on a phenyl carboxylic acid-grafted multiwalled carbon nanotube (MWNT) modified glass carbon electrode (GCE) and carbon-screen printed electrode (SPE) was fabricated for acetylcholine detection in human blood samples. Phenyl carboxylic acid-modified MWNT supports were prepared by electrochemical polymerization of 4-carboxyphenyl diazonium salts, which were synthesized by an amine group and sodium nitrite, on the surface of the MWNT-modified GCE and SPE in 0.1 M PBS. The successful fabrication of the AChE-ChOx-immobilized biosensor was confirmed via scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The sensing range of the biosensor based on a GCE and SPE was 1.0~10 μM and 10~100 μM, respectively. The interfering effect of 0.1 M L-ascorbic acid, 0.1 M L-cysteine, and 0.1 M uric acid to 0.1 M acetylcholine was 3.00%, 9.00%, and 3.00%, respectively. Acetylcholine in a human blood sample was detected by the AChE-ChOx-immobilized biosensor.

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