Transition metal oxides anchored on graphene/carbon nanotubes conductive network as both the negative and positive electrodes for asymmetric supercapacitor

2020 ◽  
Vol 842 ◽  
pp. 155838 ◽  
Author(s):  
Bing Ding ◽  
Xiaoliang Wu
Keyword(s):  
Carbon Nanotubes ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Conductive Network ◽  
Asymmetric Supercapacitor ◽  
Positive Electrodes

MULTIWALLED CARBON NANOTUBES BASED NANOCOMPOSITES FOR SUPERCAPACITORS: A REVIEW OF ELECTRODE MATERIALS

NANO ◽  
2012 ◽  
Vol 07 (02) ◽  
pp. 1230002 ◽  
Author(s):  
MEISAM VALIZADEH KIAMAHALLEH ◽  
SHARIF HUSSEIN SHARIF ZEIN ◽  
GHASEM NAJAFPOUR ◽  
SUHAIRI ABD SATA ◽  
SURANI BUNIRAN
Keyword(s):  
Carbon Nanotubes ◽  
Transition Metal ◽  
Conducting Polymers ◽  
Metal Oxides ◽  
Multiwalled Carbon Nanotubes ◽  
Transition Metal Oxides ◽  
Electrode Materials ◽  
Mass Density ◽  
High Mass ◽  
Multiwalled Carbon

Electrode materials are the most important factors to verify the properties of the electrochemical supercapacitor. In this paper, the storage principles and characteristics of electrode materials, including carbon-based materials, transition metal oxides and conducting polymers for supercapacitors are depicted in detail. Other factors such as electrode separator and electrolyte are briefly investigated. Recently, several works are conducted on application of multiwalled carbon nanotubes (MWCNTs) and MWCNTs-based electrode materials for supercapacitors. MWCNTs serve in experimental supercapacitor electrode materials result in specific capacitance (SC) value as high as 135 Fg-1. Addition of pseudocapacitive materials such as transition metal oxides and conducting polymers in the MWCNTs results in electrochemical performance improvement (higher capacitance and conductivity). The nanocomposites of MWCNTs and pseudocapacitive materials are the most promising electrode materials for supercapacitors because of their good electrical conductivity, low cost and high mass density.

scholarly journals Towards controlling the reversibility of anionic redox in transition metal oxides for high-energy Li-ion positive electrodes

2021 ◽  
Vol 14 (4) ◽  
pp. 2322-2334
Author(s):  
Yang Yu ◽  
Pinar Karayaylali ◽  
Dimosthenis Sokaras ◽  
Livia Giordano ◽  
Ronghui Kou ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
High Energy ◽  
Li Ion Batteries ◽  
Positive Electrodes ◽  
Li Ion

Transition metal d-states and oxygen p-states overlap and oxygen lattice integrity dictates the oxygen redox reversibility in metal substituted Li2RuO3 positive electrodes for Li-ion batteries.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

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