scholarly journals Temperature and Field Induced Variations of Electric Conductivities of HTV Silicone Rubbers Derived from Measured Currents and Surface Potential Decay Characteristics

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2982
Author(s):  
Shahid Alam ◽  
Yuriy V. Serdyuk ◽  
Stanislaw M. Gubanski
Keyword(s):  
Open Circuit ◽  
Material Surface ◽  
Applied Electric Field Strength ◽  
High Voltage Direct Current ◽  
Temperature Dependences ◽  
Potential Decay ◽  
Material Sample ◽  
Silicone Rubbers ◽  
A Current ◽  
Circuit Configuration

The temperature and field dependencies of electric conductivities of two types of silicone rubber-based polymers intended for use in high voltage direct current applications are presented and discussed. The conductivities obtained with the standard method by measuring a current through the material sample placed between metallic electrodes in response to the applied voltage are compared with those deduced from the measured potential decay on pre-charged material surface in an open circuit configuration. The measurements were conducted in the range of the applied electric field strength (0.5–5) kV/mm and temperatures ranging from 22 °C to 70 °C. It is shown that the values of the conductivities obtained by the two methods are in agreement and their temperature dependences obey Arrhenius law yielding similar activation energies.

scholarly journals Fabrication and Testing of All-solid-state Nanoscale Lithium Batteries Using LiPON for Electrolytes

2018 ◽  
Vol 53 ◽  
pp. 01008
Author(s):  
Feihu Tan ◽  
XiaoPing Liang ◽  
Feng Wei ◽  
Jun Du
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Solid State ◽  
Magnetron Sputtering ◽  
Specific Capacity ◽  
Rf Magnetron Sputtering ◽  
Open Circuit ◽  
Working Pressure ◽  
Thin Film Battery ◽  
A Current

The amorphous LiPON thin film was obtained by using the crystalline Li3PO4 target and the RF magnetron sputtering method at a N2 working pressure of 1 Pa. and then the morphology and composition of LiPON thin films are analysed by SEM and EDS. SEM shows that the film was compact and smooth, while EDS shows that the content of N in LiPON thin film was about 17.47%. The electrochemical properties of Pt/LiPON/Pt were analysed by EIS, and the ionic conductivity of LiPON thin films was 3.8×10-7 S/cm. By using the hard mask in the magnetron sputtering process, the all-solid-state thin film battery with Si/Ti/Pt/LiCoO2/LiPON/Li4Ti5O12/Pt structure was prepared, and its electrical properties were studied. As for this thin film battery, the open circuit voltage was 1.9 V and the first discharge specific capacity was 34.7 μAh/cm2·μm at a current density of 5 μA/cm-2, indicating that is promising in all-solidstate thin film batteries.

La dissolution du chlorure cuivreux formé par oxydation électrochimique du cuivre

1982 ◽  
Vol 60 (5) ◽  
pp. 616-623 ◽  
Author(s):  
Robert-Louis Brossard
Keyword(s):  
Copper Chloride ◽  
Ionic Species ◽  
Open Circuit ◽  
Complete Disappearance ◽  
Rotating Disc ◽  
Electrode Voltage ◽  
Stationary Electrode ◽  
Local Enrichment ◽  
Rapid Drop ◽  
A Current

We have studied the dissolution of copper chloride formed by the electrochemical oxidation of copper immersed in aqueous lithium chloride. The pH was maintained between 3 and 5 while the concentration of LiCl in solution was varied between 2.36 × 10−2 M to 16.5 × 10−2 M. The corrosion product accumulating on the electrode consists of crystals of nantokite (CuCl) formed by precipitation.The presence of this precipitate contributes to the local enrichment of the solution which is close to saturation near the electrode. This enrichment is revealed by an electrode voltage in a well characterized open circuit. This current is about −40 mV (/ECS) on a stationary electrode. The complete dissolution of CuCl coincides with a rapid drop in voltage which allows the transition time τ to be defined from which the speed of dissolution of CuCl has been calculated. For example, the speed of dissolution is 0.15 ± 0.01 mC s−1 cm2 in a current equivalent for a stationary electrode in the presence of 2.36 × 10−2 M of dissolved LiCl. This is also constant until the complete disappearance of the precipitate.In another study, the use of a rotating disc electrode shows that the dissolution is completely dominated by the diffusion of ionic species in the liquid phase. The experimental results are compatible with the presence of CuCl2− as the diffusing species. [Journal Translation]

A study of the electrochemical behaviour of cobalt in aqueous H2CO3/HCO3–/CO32– solutions at pH 7–9

2004 ◽  
Vol 82 (5) ◽  
pp. 583-594 ◽  
Author(s):  
Stéphan Simard ◽  
Danick Gallant
Keyword(s):  
Open Circuit Potential ◽  
Competitive Adsorption ◽  
Carbonic Acid ◽  
Acid Corrosion ◽  
Electrochemical Behaviour ◽  
Open Circuit ◽  
Corrosion Process ◽  
Rotating Disc ◽  
Solution Interface ◽  
Potential Decay

The electrochemical behaviour of a cobalt rotating electrode in H2CO3/HCO3–/CO32– aqueous solutions was investigated in the pH region from 7 to 9. The effects of H2CO3/HCO3–/CO32– concentration, pH, and the presence of phosphates as inhibitors was explored using a rotating disc electrode at 1000 rpm. Some potentiodynamic experiments indicate that for pH 8.5 and higher, carbonate and bicarbonate species play a key role on the rate of electrooxidation of cobalt. For pH lower than 8.5, the electrochemical behaviour of cobalt changes drastically and very aggressive corrosion is observed. The involvement of carbonic acid must be considered in the corrosion process of cobalt in this pH region. The study of passive film potential decay under open circuit potential and galvanostatic reduction was performed on preanodized cobalt electrodes in solutions of various compositions. These experiments indicated the phenomena occurring at the electrode–solution interface during the corrosion process. A mechanism involving competitive adsorption of different species is suggested on the basis of the experimental evidence.Key words: cobalt, bicarbonate, phosphate, carbonic acid, corrosion.

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