Electrochemical accessibility of porous submicron MnO2 spheres as active electrode materials for electrochemical capacitors

2016 ◽  
Vol 201 ◽  
pp. 20-29 ◽  
Author(s):  
Axel Gambou-Bosca ◽  
Daniel Bélanger
Keyword(s):  
Electrode Materials ◽  
Electrochemical Capacitors ◽  
Active Electrode

scholarly journals N-doped graphene foam obtained by microwave-assisted exfoliation of graphite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Malgorzata Skorupska ◽  
Anna Ilnicka ◽  
Jerzy P. Lukaszewicz
Keyword(s):  
Electron Microscopy ◽  
Electrode Materials ◽  
Elemental Content ◽  
Research Approach ◽  
Pristine Graphene ◽  
Active Electrode ◽  
Graphene Foam ◽  
Practical Applications ◽  
Microwave Reactor ◽  
Doped Graphene

AbstractThe synthesis of metal-free but electrochemically active electrode materials, which could be an important contributor to environmental protection, is the key motivation for this research approach. The progress of graphene material science in recent decades has contributed to the further development of nanotechnology and material engineering. Due to the unique properties of graphene materials, they have found many practical applications: among others, as catalysts in metal-air batteries, supercapacitors, or fuel cells. In order to create an economical and efficient material for energy production and storage applications, researchers focused on the introduction of additional heteroatoms to the graphene structure. As solutions for functionalizing pristine graphene structures are very difficult to implement, this article presents a facile method of preparing nitrogen-doped graphene foam in a microwave reactor. The influence of solvent type and microwave reactor holding time was investigated. To characterize the elemental content and structural properties of the obtained N-doped graphene materials, methods such as elemental analysis, high-resolution transmission electron microscopy, scanning electron microscopy, and Raman spectroscopy were used. Electrochemical activity in ORR of the obtained materials was tested using cyclic voltamperometry (CV) and linear sweep voltamperometry (LSV). The tests proved the materials’ high activity towards ORR, with the number of electrons reaching 3.46 for tested non-Pt materials, while the analogous value for the C-Pt (20 wt% loading) reference was 4.

Biomass-derived interconnected carbon nanoring electrochemical capacitors with high performance in both strongly acidic and alkaline electrolytes

2017 ◽  
Vol 5 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Xianjun Wei ◽  
Yongbin Li ◽  
Shuyan Gao
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Electrochemical Capacitors ◽  
High Rate ◽  
Alkaline Electrolytes

The match between sustainable electrode materials and electrolytes is the key to achieve high-rate electrochemical capacitors.

Doping of active electrode materials for electrochemical batteries: an electronic structure perspective

2017 ◽  
Vol 7 (3) ◽  
pp. 523-540 ◽  
Author(s):  
Johann Lüder ◽  
Fleur Legrain ◽  
Yingqian Chen ◽  
Sergei Manzhos
Keyword(s):  
Electronic Structure ◽  
Electrode Materials ◽  
Active Electrode ◽  
Image Position

Abstract

scholarly journals Ce-Doped PANI/Fe3O4 Nanocomposites: Electrode Materials for Supercapattery

2021 ◽  
Vol 3 ◽  
Author(s):  
Subash Pandey ◽  
Shova Neupane ◽  
Dipak Kumar Gupta ◽  
Anju Kumari Das ◽  
Nabin Karki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrode Material ◽  
High Performance ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Maximum Energy ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Active Electrode ◽  
Transmission Electron

In this study, we report on a combined approach to preparing an active electrode material for supercapattery application by making nanocomposites of Polyaniline/Cerium (PANI/Ce) with different weight percentages of magnetite (Fe3O4). Fourier-transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD) analyses supported the interaction of PANI with Ce and the formation of the successful nanocomposite with magnetite nanoparticles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses showed the uniform and porous morphology of the composites. Cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) were used to test the supercapattery behavior of the nanocomposite electrodes in 1.0 M H2SO4. It was found that the supercapattery electrode of PANI/Ce+7 wt.% Fe3O4 exhibited a specific capacity of 171 mAhg−1 in the potential range of −0.2 to 1.0 V at the current density of 2.5 Ag−1. Moreover, PANI/Ce+7 wt.% Fe3O4 revealed a power density of 376.6 Wkg−1 along with a maximum energy density of 25.4 Whkg−1 at 2.5 Ag−1. Further, the cyclic stability of PANI/Ce+7 wt.% Fe3O4 was found to be 96.0% after 5,000 cycles. The obtained results suggested that the PANI/Ce+Fe3O4 nanocomposite could be a promising electrode material candidate for high-performance supercapattery applications.

Design and synthesis of hierarchical mesoporous WO3-MnO2 composite nanostructures on carbon cloth for high-performance supercapacitors

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Pragati A. Shinde ◽  
Vaibhav C. Lokhande ◽  
Amar M. Patil ◽  
Taeksoo Ji ◽  
Chandrakant D. Lokhande
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Rational Design ◽  
Electrode Materials ◽  
Mesoporous Structure ◽  
Carbon Cloth ◽  
Power Performance ◽  
Active Electrode ◽  
Composite Nanostructures ◽  
Design And Synthesis

AbstractTo enhance the energy density and power performance of supercapacitors, the rational design and synthesis of active electrode materials with hierarchical mesoporous structure is highly desired. In the present work, fabrication of high-performance hierarchical mesoporous WO

Development of electrochemical sensor based on cobalt oxide/tin oxide composite for determination of antibiotic drug ornidazole

2021 ◽  
Author(s):  
Koventhan Chelliah ◽  
Venkatachalam Vinothkumar ◽  
Shen-Ming Chen
Keyword(s):  
Chemical Synthesis ◽  
Electrochemical Sensor ◽  
Tin Oxide ◽  
Electrode Materials ◽  
Active Electrode ◽  
Fast Kinetics ◽  
Antibiotic Drug ◽  
Catalytic Sites ◽  
Simple Chemical

The simple chemical synthesis is highly efficient to develop metal oxides composite as active electrode materials for the detection of an electrochemical sensor displaying enhanced catalytic sites, fast kinetics, and...

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