Voltammetric and Chronopotentiometric Study of Nonstationary Processes at the Oxygen-Evolving Anodes in KF–NaF–AlF3–Al2O3 Melt

Abstract. Some features of behavior and kinetic of the anodic processes for the platinum and Cu–Fe–Ni alloy in the KF–NaF–AlF3–Al2O3 melts at 1025–1055 K have been studied by cyclic voltammetry and chronopotentiometry.The obtained results allowed us to conclude that mechanisms of the anodic processes at the platinum and Cu–Fe–Ni alloy are similar. Both mechanisms include the oxidation stage of electrode material. A rate of this stage is determined to depend significantly on the melt temperature.

Download Full-text

Preparation and Electrochemical Properties of LaMnO3 Powder as a Supercapacitor Electrode Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.727.698 ◽

2017 ◽

Vol 727 ◽

pp. 698-704 ◽

Cited By ~ 3

Author(s):

Xian Wei Wang ◽

Xiao Er Wang ◽

Hui Chao Zhang ◽

Qian Qian Zhu ◽

Dong Li Zheng ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Electrochemical Properties ◽

Electrode Material ◽

Raw Materials ◽

Sol Gel ◽

Galvanostatic Charge ◽

Supercapacitor Electrode ◽

Lanthanum Manganate ◽

Pure Phase ◽

Charge Discharge

The structural and electrochemical properties of lanthanum manganate (LaMnO3) powder prepared by the sol-gel method are researched in this article. The powder calcined at 600 °C showed amorphous, and the powder calcined at 700-800 °C showed the pure phase of the LaMnO3. The grains with the size of about 80-120 nm were agglomerating together. Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical properties in alkaline environment. The electrochemical properties calcined at 700 °C showed a specific capacitance of 73 F/g at the current density of 0.5 A/g. The raw materials for preparing the LaMnO3 powder are cheap, and the operation method is simple.

Download Full-text

Cyclic voltammetry for reversible anodic dissolution of the electrode material inhibited by a redox adsorption process

Journal of Electroanalytical Chemistry ◽

10.1016/s0022-0728(76)80070-8 ◽

1976 ◽

Vol 67 (1) ◽

pp. 123-128 ◽

Cited By ~ 3

Author(s):

Sergio Casadio

Keyword(s):

Cyclic Voltammetry ◽

Anodic Dissolution ◽

Electrode Material ◽

Adsorption Process

Download Full-text

Self-Assembly of α-MnO2 Nanorods into Spheres: Synthesis and Electrochemical Properties

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.18216 ◽

2008 ◽

Vol 8 (3) ◽

pp. 1494-1496 ◽

Cited By ~ 5

Author(s):

Xu Chun Song ◽

Yi Fan Zheng ◽

E. Yang ◽

Yun Wang

Keyword(s):

Cyclic Voltammetry ◽

Sodium Dodecyl Sulfate ◽

Electrochemical Properties ◽

Electrode Material ◽

Self Assembly ◽

Sodium Dodecyl ◽

Electrochemical Characterization ◽

Dodecyl Sulfate ◽

Hydrothermal Approach

The α-MnO2 spherical assemblies were prepared via a facile hydrothermal approach in the presence of sodium dodecyl sulfate (SDS). The assembled nanostructures were composed of the MnO2 nanorods with 150–200 nm in width and several micrometers in length. The products were characterized by SEM, TEM and XRD. The electrochemical characterization was carried out by cyclic voltammetry, which indicated that the α-MnO2 spherical assemblies were of an excellent electrode material for supercapacitor.

Download Full-text

Cyclic voltammetry of samarium ions in the molten LiCl-KCl eutectic for diffusion coefficient analysis

10.1149/osf.io/2smcu ◽

2019 ◽

Author(s):

Vickram Singh ◽

Christopher Bruneau ◽

Dev Chidambaram

Keyword(s):

Cyclic Voltammetry ◽

Diffusion Coefficient ◽

Surface Area ◽

Electrode Surface ◽

Measurement Errors ◽

Current Response ◽

High Concentration ◽

Melt Temperature ◽

Peak Current ◽

Working Electrode

Cyclic voltammetry (CV) was used to investigate the electrochemical behavior of SmCl3 when it is solvated in the molten LiCl-KCl eutectic at 773 K. An experimental method obtained from the literature was adjusted to produce repeatable current responses attributed to the Sm3+/Sm2+ reaction couple and to determine working electrode surface area. The effect of solvating SmCl3 at high concentration was investigated as it relates to electrochemical reversibility and diffusion coefficient analysis. An electrochemically reversible region was identified using correlations between the current response and the scan rate along with peak current ratio measurements. In these, the reversibility was unaffected by increasing concentration. The correlation between current response and concentration was less linear than expected, suggesting the effects of additional modes of diffusion, solution resistance, and charge transfer kinetics may be contributing more at high concentrations. The measurement errors associated with peak current response, working electrode surface area, and melt temperature were used to estimate the associated uncertainties of the reported diffusion coefficients of Sm3+ in the molten LiCl-KCl eutectic. These diffusion coefficient values were found to be relatively consistent with values for Sm3+ reported in the literature for lower concentrations.

Download Full-text

Synthesis and Characterization of Complex from K4[Co(SCN)6], Zinc(II) Chloride and Quinoline as Electrode Material of K-Ion Battery

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.851.3 ◽

2020 ◽

Vol 851 ◽

pp. 3-8

Author(s):

Ade Rifaldi ◽

Fariati ◽

Husni Wahyu Wijaya ◽

Wiwin Dwi Jayanti ◽

Stephane Golhen ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Prussian Blue ◽

Electrode Material ◽

Reduction Potential ◽

Synthesis And Characterization ◽

Direct Reaction ◽

Reaction Method ◽

Ft Ir

Prussian Blue Like (PBL) compounds that are potentially used as K-Ion Battery (KIB) electrodes have been synthesized from zinc(II) chloride and quinoline (Qn) precursors combining melting and direct reaction method. The formed K2[Zn(Qn)2][Co(SCN)6] compounds melt in range 179-181°C with conductivity value reaches 468 μS/cm. Thiocyanate and quinoline ligands were characterized using FT-IR and UV-Vis spectrometry. The cyclic voltammetry of the formed compounds showed the reduction potential up to -0.34 V (versus AgCl/Ag).

Download Full-text

Study on Electrochemical Stripping Method of Graphene Electrode and Its Capacitive Properties

Science of Advanced Materials ◽

10.1166/sam.2021.3958 ◽

2021 ◽

Vol 13 (4) ◽

pp. 608-614

Author(s):

Qi Qin ◽

Yi-Ran Cui ◽

Meng Song ◽

Ji-Yuan Li ◽

Yan-Jie Wang ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Specific Surface ◽

Electrode Material ◽

Cyclic Voltammetry Curve ◽

Voltage Range ◽

Graphene Electrode ◽

Capacitive Properties ◽

Stripping Method ◽

Constant Potential ◽

Electrochemical Stripping

Graphene has excellent properties, such as excellent conductivity, more pores, stable chemical and structural properties, high specific surface area, so it is usually used in the battery fields. In order to further explore the capacitive properties of graphene, this experiment used electrochemical stripping method, the electrochemical electrode was characterized by constant potential treatment methods, cyclic voltammetry curve, and constant current charging–discharging curve. The capacitive performance of modified graphene at different potentials was compared. If a constant potential peeling treatment is performed, the interlayer spacing of graphene increases, and this time, the specific surface area is enlarged, and the electrical properties of the graphene electrode material are correspondingly improved. Cyclic voltammetry curve results show that the graphene electrode exhibits better capacitance performance after being treated with a constant potential in neutral electrolyte. When treating with 3.1 V constant potential and voltage range of -1.1 V–1.1 V, capacitance can reach 327.273 F. The chronopotentiometry curve results show that 3.1 V graphene electrode mass ratio capacitance can reach 218.182 F/g under voltage range of -0.3 V–0.3 V, meeting the energy storage requirements of the battery industry, and it is expected to become an ideal electrode material in the field of supercapacitors.

Download Full-text

Graphene Oxide Nanoplate-MnO2 Composites for Supercapacitors

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.944 ◽

2012 ◽

Vol 512-515 ◽

pp. 944-947 ◽

Cited By ~ 1

Author(s):

Jia Wei Deng ◽

Huan Pang ◽

Shao Mei Wang ◽

Jiang Shan Zhang

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Cyclic Voltammetry ◽

Graphene Oxide ◽

Ambient Temperature ◽

Electrochemical Properties ◽

Electrode Material ◽

Supercapacitor Electrode ◽

Scanning Electron

Graphene oxide nanoplate-MnO2composites have been synthesized by oxidizing part of the carbon atoms in the framework of graphene oxide nanoplates at ambient temperature. The composites were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Their microstructures and morphologies have affected their electrochemical properties. Compared with MnO2nanoparticles, the nanocomposite prepared reveals better electrochemical properties as a supercapacitor electrode material.

Download Full-text