Stimulation Electrode Materials and Electrochemical Testing Methods

2009 ◽  
pp. 191-216 ◽  
Author(s):  
Andy Hung ◽  
Ira B. Goldberg ◽  
Jack W. Judy
Keyword(s):  
Electrode Materials ◽  
Testing Methods ◽  
Electrochemical Testing ◽  
Stimulation Electrode

Ordered Mesoporous Carbon Nano Spheres as Electrode Material for Supercapacitors

2013 ◽  
Vol 320 ◽  
pp. 661-664
Author(s):  
Hai Jing Zhao ◽  
Dong Lin Zhao ◽  
Ji Ming Zhang ◽  
Dong Dong Zhang
Keyword(s):  
Mesoporous Carbon ◽  
Electrode Materials ◽  
Rate Capability ◽  
Nitrogen Adsorption ◽  
Ordered Mesoporous Carbon ◽  
Electrochemical Performances ◽  
Carbon Nanospheres ◽  
Electrochemical Testing ◽  
Ordered Mesoporous ◽  
Coating Method

Ordered mesoporous carbon nanospheres with uniformly penetrating channels have been successfully synthesized by a nanocasting method using mesoporous silica as a template. The ordered mesoporous carbon nanospheres were investigated as electrode materials for supercapacitors via high-resolution transmission electron microscopy, nitrogen adsorption and desorption isotherms and a variety of electrochemical testing techniques. The electrodes with ordered mesoporous carbon nanospheres prepared by coating method exhibited good rate capability and reversibility at high scan rates in electrochemical performances. Ordered mesoporous carbon nanosphere electrode with specific surface area of 904 m2/g maintained a stable specific capacitance of 210 F g-1under specific current of 0.1 A g-1for 500 cycles of charge/discharge.

Optimization of Catholyte in Hydrogen Redox Fuel Cell

2015 ◽  
Vol 737 ◽  
pp. 97-104
Author(s):  
Zi Xue Wang ◽  
Jie Fu ◽  
Chao Du ◽  
Yang Zhang
Keyword(s):  
Water Management ◽  
Fuel Cell ◽  
Reaction Mechanism ◽  
Cell Performance ◽  
Catalyst Poisoning ◽  
Carbon Felt ◽  
Testing Methods ◽  
Membrane Degradation ◽  
Cathode Polarization ◽  
Electrochemical Testing

Redox electric couple species used in the catholyte of the hydrogen redox fuel cell was screened through the electrochemical testing methods, and the catholyte composition and concentration were optimized by studying the reaction mechanism and laws on different electrodes, then the inside battery structure was also designed. The results showed that when using the carbon felt as electrode, platinum as catalyst, ferric/ferrous ion solution as the most suitable catholyte optimal performance could be obtained. This method can reduce the cathode polarization and the amount of catalysts. It can also solve the problem of catalyst poisoning and membrane degradation, simplify water management, effectively reduce the costs and improve cell performance and reliability.

scholarly journals Nanoelectrode Ensembles Consisting of Carbon Nanotubes

2021 ◽  
Vol 11 (18) ◽  
pp. 8399
Author(s):  
Gabrielle R. Dangel ◽  
Hope Kumakli ◽  
Connor E. Rahm ◽  
Ryan White ◽  
Noe T. Alvarez
Keyword(s):  
Carbon Nanotubes ◽  
Cross Sections ◽  
Electrode Materials ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Electrochemical Testing ◽  
Aspect Ratios ◽  
Scientific Innovation ◽  
Random Arrays

Incorporating the nanoscale properties of carbon nanotubes (CNTs) and their assemblies into macroscopic materials is at the forefront of scientific innovation. The electrical conductivity, chemical inertness, and large aspect ratios of these cylindrical structures make them ideal electrode materials for electrochemical studies. The ability to assemble CNTs into nano-, micro-, and macroscale materials broadens their field of applications. Here, we report the fabrication of random arrays of CNT cross-sections and their performance as nanoelectrode ensembles (NEEs). Single ribbons of drawable CNTs were employed to create the CNT-NEEs that allows easier fabrication of nanoscale electrodes for general electrochemical applications. Surface analysis of the prepared NEEs using scanning electron microscopy showed a random distribution of CNTs within the encapsulating polymer. Electrochemical testing via cyclic voltammetry and scanning electrochemical cell microscopy revealed voltametric differences from the typical macroelectrode response with the steady-state nature of NEEs. Finally, when the NEE was employed for Pb2+ detection using square-wave anodic stripping voltammetry, a limit of detection of 0.57 ppb with a linear range of 10–35 ppb was achieved.

Origami Fabrication of SU-8 Supercapacitors

Materials ◽  
2005 ◽  
Author(s):  
Hyun Jin In ◽  
Sundeep Kumar ◽  
Shao-Horn Yang ◽  
George Barbastathis
Keyword(s):  
Electrode Materials ◽  
Three Dimensional ◽  
Electrochemical Capacitor ◽  
Testing Procedure ◽  
Storage Device ◽  
Two Dimensional ◽  
Electrochemical Testing ◽  
3D Geometry ◽  
Improved Performance ◽  
Tools And Techniques

The Nanostructured Origami™ 3D Fabrication and Assembly Process was developed as a novel method of creating three-dimensional (3D) nanostructured devices using two-dimensional micro- and nanopatterning tools and techniques. The origami method of fabrication is a two-part process in which two-dimensional (2D) membranes are first patterned and then folded into the desired 3D configuration. This paper reports on the use of the Nanostructured Origami™ process to create a functional electrochemical energy storage device. An electrochemical capacitor, or a supercapacitor, is selected because its performance can be readily improved by the addition of 3D geometry and nanoarchitecture. In addition to improved performance, the origami fabrication method allows such devices to be integrated into preexisting MEMS and IC processes, thus enabling the fabrication of complete micro- and nanosystems with an integrated power supply. The supercapacitors were created by selectively depositing carbon-based electrode materials on the SU-8 membrane and then folding the structure so that oppositely-charged electrode regions face each other in a 3D arrangement. The fabrication process, electrochemical testing procedure, and analysis of the results are presented.

Alloy Oxide Electrocatalysts for Regenerative Hydrogen-Halogen Fuel Cell

2011 ◽  
Vol 1311 ◽  
Author(s):  
Sujit K Mondal ◽  
Jason Rugolo ◽  
Michael J. Aziz
Keyword(s):  
Fuel Cell ◽  
Large Scale ◽  
Electrode Materials ◽  
Small Mass ◽  
Synthesis Methods ◽  
Manganese Alloy ◽  
Wet Chemical Synthesis ◽  
Electrochemical Testing ◽  
Catalytically Active ◽  
Wet Chemical

ABSTRACTStable, catalytically active, and inexpensive halogen electrodes are essential for the success of the regenerative hydrogen-halogen fuel cell as a competitive means of large-scale electricity storage. We report the synthesis and electrochemical testing of two novel electrode materials — ruthenium-cobalt and ruthenium-manganese alloy oxides. These alloys were fabricated by wet chemical synthesis methods as a coating on a titanium metal substrate and tested for chloride and bromide oxidation and for chlorine and bromine reduction. These alloy oxides exhibit high catalytic potency and good electrical conductivity good stability, while having a significantly reduced precious metal composition compared to commercial chloride oxidation electrodes made of the oxide of a ruthenium-titanium alloy. We tested alloys with Ru content as low as 1% that maintained good electrochemical activity. Stability tests indicate immeasurably small mass loss.

scholarly journals Lithium Ions Batteries Electrodes Materials, Design, Outlook and Future Perspectives

2021 ◽  
Vol 353 ◽  
pp. 01022
Author(s):  
Xiangrui Li
Keyword(s):  
Electrode Materials ◽  
Review Paper ◽  
Coulombic Efficiency ◽  
Morphological Structure ◽  
Lithium Ion ◽  
Future Perspectives ◽  
Testing Methods ◽  
Interface Formation ◽  
Lithium Ions ◽  
Big Picture

With the rapid growth of lithium-ion batteries (LIBs) industry and market, it is important to develop LIBs with higher capacities, stability and lifespan. However, challenges like low conductivity, solid electrolyte interface formation and electrode cracking now are in the way, which are closely related to electrode deficiency. Hence, to obtain better performance, the main orientation is to improve electrode materials’ morphological structure. Better porosity, stability and conductivity of anode and cathode materials tangibly improve the performance of LIBs including coulombic efficiency, safety and cyclic lifespan. This review paper will combine current challenges, commonly used and emerging electrode materials together with battery testing methods and their market trend to provide a big picture about LIBs

Use of Scanning Vibrating Electrode Technique to Localized Corrosion Evaluation

2015 ◽  
Vol 228 ◽  
pp. 353-368 ◽  
Author(s):  
Bożena Łosiewicz ◽  
Magdalena Popczyk ◽  
Magdalena Szklarska ◽  
Agnieszka Smołka ◽  
Patrycja Osak ◽  
...  
Keyword(s):  
Current Density ◽  
Potential Gradient ◽  
Localized Corrosion ◽  
Review Of The Literature ◽  
Testing Methods ◽  
Electrochemical Testing ◽  
Local Element ◽  
Corrosion Evaluation ◽  
Alloy Steels ◽  
Electrode Technique

This work presents the basic theory and the usability of the scanning vibrating electrode technique (SVET), especially in the field of corrosion. At present, SVET is to be considered as one of the latest electrochemical testing methods. The essence of determining the current density resulting from corrosion is limited to the measurement of the potential gradient between the two points on the surface of the metal and over it, within the electric field of a local element. SVET has been used to study local, galvanic and intercrystalline corrosion. It is particularly useful in studying the corrosion of alloy steels and welding agents. This paper presents a review of the literature on the newest research in this field.

Carbon-Halide Nanocomposites for Asymmetric Hybrid Supercapacitors

2007 ◽  
Vol 1056 ◽  
Author(s):  
Prabeer Barpanda ◽  
Giovanni Fanchini ◽  
Glenn G Amatucci
Keyword(s):  
Electrode Materials ◽  
Activated Carbons ◽  
High Energy ◽  
Iodine Doping ◽  
Energy Storage Devices ◽  
Subsequent Formation ◽  
Storage Devices ◽  
Hybrid Supercapacitors ◽  
Electrochemical Testing ◽  
Bet Analysis

ABSTRACTNanostructured materials and nanocomposites have inspired many structural and functional applications in recent time. In the last decade, energy-storage devices have employed electrode materials in form of nanomaterials/nanocomposites to yield promising electrochemical performance. The current paper throws light on the application of nanostructured pristine activated carbons as well as chemically modified carbon-halide nanocomposites in practical electrochemical supercapacitors. Pristine activated carbons have been mechanochemically modified via high-energy milling and iodine doping to produce carbon-halide nanocomposites. A significant change in existing physical and electrochemical properties has been marked by introduction of iodine into carbon and the subsequent formation of nanocomposites. The effect of halides and nanoscale morphology is discussed using X-ray, Raman spectroscopy, DSC, BET analysis and electrochemical testing.

Electrochemical Performance of Graphene Nanosheets as Electrode Material for Supercapacitors

2013 ◽  
Vol 873 ◽  
pp. 581-586
Author(s):  
Liang Yu Li ◽  
Dong Lin Zhao ◽  
Dong Dong Zhang
Keyword(s):  
Electrochemical Performance ◽  
Electrode Materials ◽  
Graphene Nanosheets ◽  
Rate Capability ◽  
Nitrogen Adsorption ◽  
Rapid Expansion ◽  
Electrochemical Performances ◽  
Electrochemical Testing ◽  
Transmission Electron ◽  
Coating Method

Graphene nanosheets (GNSs) were prepared from flake natural graphite by oxidation, rapid expansion and ultrasonic treatment. The morphology, structure and electrochemical performance of GNSs as electrode materials for supercapacitors were systematically investigated via high-resolution transmission electron microscopy, X-ray diffraction, nitrogen adsorption and desorption isotherms and a variety of electrochemical testing techniques. The electrodes with freestanding GNSs prepared by coating method exhibited good rate capability and reversibility at high scan rates in electrochemical performances. GNS electrode with specific surface area of 243 m2 g1 maintained a stable specific capacitance of 200 F g1 under specific current of 0.1 A g1 for 500 cycles of charge/discharge.

Study of Electrochemical Properties of NiCo2O4/ Reduced Graphene Oxide / PEDOT:PSS Ternary Nanocomposite for High Performance Supercapacitor Electrode

2021 ◽  
Vol 19 (8) ◽  
pp. 77-83
Author(s):  
Baraa Abd Alreda ◽  
Shaymaa Hadi Al-Rubaye
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Supercapacitor Electrode ◽  
Super Capacitor ◽  
Ternary Composite ◽  
Electrochemical Testing ◽  
Step Procedure ◽  
Reduced Graphene ◽  
Poly Styrene Sulfonate ◽  
A Current

A two-step procedure is used to create a novel ternary composite NiCo2O4 hexagonalnanoplatesarray/ reducedgrapheneoxide/poly(3,4ethylenedioxythiophene): poly (styrene-sulfonate) (NiCo2O4-rGO/PEDOT:PSS). It was tested to see if it might be used in super capacitor electrode materials. According to electrochemical testing, the NiCo2O4-rGO-PEDOT. PSS materials has a great exact capacitance of 1115 Fg.1 on a current compactness of 2 Ag-1, decent rate ability, and excellent cycle stability, with capacitance retention of 88 percent after 10000 cycles. As a consequence, this ternary composite may find use in a variety of energy storage electrodes.

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