Residual Capacitance Estimation in Lithium-Thionyl-Chloride Chemical Current Sources using Impedance Spectroscopy

2021 ◽  
pp. 116-125
Author(s):  
E.M. Petrenko ◽  
V.A. Semenova
Keyword(s):  
Impedance Spectroscopy ◽  
Extreme Point ◽  
Thionyl Chloride ◽  
Fourier Transforms ◽  
Electrochemical Impedance ◽  
Current Source ◽  
Experimental Studies ◽  
Electrochemical Impedance Spectra ◽  
Single Experiment ◽  
Impedance Characteristics

Purpose of this work is to elaborate operational and reliable method for ensuring non-destructive control over primary lithium-thionyl-chloride chemical current sources (LCCS) using the impedance spectroscopy. Results and conclusions presented in this work are based on a series of experimental studies. Result reliability was experimentally proven on models and samples with known characteristics. Mathematical apparatus used in processing experimental data using the Fourier transforms allows obtaining information on impedance in a wide frequency range based on results of a single experiment and prompt calculating its main parameters (impedance imaginary value at the hodograph extreme point, its frequency, high-frequency resistance and phase). Ways to reduce the passive film influence, which is appearing on the lithium electrode during storage and operation, on the impedance characteristics are shown. Based on the electrochemical impedance spectra analysis, most informative frequency ranges were determined, and correlates were found connecting the impedance characteristics with the investigated current source state. It is proposed to use the phase angle value measured at the impedance hodograph extreme point as a correlate allowing to estimate the LCCS residual capacitance. It was determined that in assessing the LCCS discharge degree in the range of 0--70 % residual capacity, results of impedance spectroscopy are being quite informative

Use and misuse of electrochemical impedance spectroscopy in PEFC research

2019 ◽  
Author(s):  
Pierre Boillat ◽  
Lorenz Gubler ◽  
Felix N. Büchi ◽  
Thomas J. Schmidt
Keyword(s):  
Fuel Cells ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Polymer Electrolyte ◽  
Electrochemical Impedance ◽  
Polymer Electrolyte Fuel Cells ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Comprehensive Review ◽  
Research Show

In this presentation, two important pitfalls ocuring during the analysis of electrochemical impedance spectra (EIS) of polymer electrolyte fuel cells (PEFCs) are discussed. Based on very simple considerations, some commonly found interpretation statements are identified as wrong. A comprehensive review of the papers published during the year 2018 using EIS in PEFC research show that such wrong statements are not occasional, but frequently occurring in the peer reviewed literature. At the end of the presentation, solution are proposed to increase the awareness to the risks of wrong EIS interpretations.

Considerations on Reducing the Experimental Duration of Electrochemical Impedance Spectroscopy Measurements Used for the Evaluation of Ionic Conductivity in Polymer Electrolyte Membrane Electrolysers and Fuel Cells

2009 ◽  
Vol 415 ◽  
pp. 61-64 ◽  
Author(s):  
Danut Ionel Vaireanu ◽  
Anca Cojocaru ◽  
Ioana Maior ◽  
Simona Caprarescu ◽  
Alexandra Ionescu ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Polymer Electrolyte Membrane ◽  
Membrane Thickness ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Electrolyte Membrane ◽  
Eis Measurements

In this paper one attempted to discuss the effect of reducing the experimental duration of electrochemical impedance spectroscopy (EIS) measurements by reducing the sampling frequency without affecting the measured parameters. The experimental setup is based on a novel cell consisting of two electrodes or three electrodes cell configuration. The experimental layout allows a precise evaluation of the membrane thickness, at micrometer resolution, during the determination of the electrochemical impedance spectra.

scholarly journals The effect of strain amount on corrosion behavior of EDDQ steel sheet

2016 ◽  
Vol 60 (4) ◽  
pp. 128-131
Author(s):  
J. Brezinová ◽  
J. Slota ◽  
M. Tomáš ◽  
J. Koncz
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Steel Sheet ◽  
Electrochemical Impedance ◽  
Experimental Studies ◽  
Corrosion Monitoring ◽  
Corrosion Properties ◽  
Modern Methods

Abstract This paper presents the results of research aimed to measuring the corrosion properties of EDDQ steel sheet. The strain amount influence to the corrosion properties of the steel sheet for drawn parts has been proven by the modern methods of corrosion monitoring such as Electrochemical Impedance Spectroscopy. Corrosion rate was assessed using electrochemical methods in 0.1 M solution of NaCl. Experimental studies have pointed out if strain amount increases the corrosion rate of the steel sheet increases too.

scholarly journals Evaluation of Temperature Influence on Electrochemical Processes Occurring in a Lithium-Ion Supercapacitor with the Use of Dynamic Electrochemical Impedance Spectroscopy

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3807
Author(s):  
Michal Mielniczek ◽  
Ewa Janicka ◽  
Lukasz Gawel ◽  
Kazimierz Darowicki
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Impedance Analysis ◽  
Electrochemical Processes ◽  
Impedance Characteristics ◽  
Lithium Ion Capacitor ◽  
Wide Range ◽  
Dynamic Electrochemical Impedance Spectroscopy

In order to obtain the full impedance characteristics of a lithium-ion capacitor as a function of temperature, the authors proposed the use of dynamic electrochemical impedance spectroscopy. Impedance tests were carried out under wide range of dynamic temperature changes for lithium-ion supercapacitors. Significant differences in electrochemical processes were observed as a result of working temperature. Moreover, the quality of fitting of the equivalent circuits most frequently used in impedance analysis of lithium-ion capacitors was discussed. The proposed methodology allows for a comprehensive characterization of the performance of these devices and provides key information for their optimization in wide range of operations.

Electrochemical Impedance Characteristics of Sintered 7075 Aluminum Alloy Under Ssrt Condition

2013 ◽  
Vol 58 (2) ◽  
pp. 505-508 ◽  
Author(s):  
S. Sunada ◽  
N. Nunomura
Keyword(s):  
Aluminum Alloys ◽  
Complex Shape ◽  
Electrochemical Impedance ◽  
Ingot Metallurgy ◽  
View Point ◽  
Corrosion Properties ◽  
Electrochemical Tests ◽  
Impedance Characteristics ◽  
Polarization Test ◽  
Conventional Ingot

Powder metallurgy (P/M) process has the advantage of better formability to fabricate complex shape products without machining and welding. And recently this P/M process has been applied to the production of aluminum alloys. The P/M aluminum alloys thus produced also have received considerable interest because of their fine and homogeneous structure. Many papers have been published on the mechanical properties of the aluminum alloys produced by P/M process while there have been few on their corrosion properties from the view point of electrochemistry. In this experiment, therefore, two kinds of 7075 aluminum alloys prepared by the conventional ingot metallurgy (I/M) process and P/M process were used, I/M material is commercially available. and their corrosion behavior were investigated through the electrochemical tests such as potentiodynamic polarization test, slow rate strain tensile (SSRT) test and electrochemical impedance spectroscopy (EIS) measurement under SSRT test in the corrosion solution and the deionized water.

The study of the electrochemical properties of zinc-rich coating on the base of water sodium silicate

2019 ◽  
Vol 24 (4) ◽  
pp. 51-58
Author(s):  
Le Hong Quan ◽  
Nguyen Van Chi ◽  
Mai Van Minh ◽  
Nong Quoc Quang ◽  
Dong Van Kien
Keyword(s):  
Carbon Steel ◽  
Electrochemical Properties ◽  
Sodium Silicate ◽  
Cathodic Protection ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Electrical Contact ◽  
Electrochemical Impedance Spectra ◽  
Pure Zinc ◽  
Electric Circuits

The study examines the electrochemical properties of a coating based on water sodium silicate and pure zinc dust (ZSC, working title - TTL-VN) using the Electrochemical Impedance Spectra (EIS) with AutoLAB PGSTAT204N. The system consists of three electrodes: Ag/AgCl (SCE) reference electrode in 3 M solution of KCl, auxiliary electrode Pt (8x8 mm) and working electrodes (carbon steel with surface treatment up to Sa 2.5) for determination of corrosion potential (Ecorr) and calculation of equivalent electric circuits used for explanation of impedance measurement results. It was shown that electrochemical method is effective for study of corrosion characteristics of ZSC on steel. We proposed an interpretation of the deterioration over time of the ability of zinc particles in paint to provide cathodic protection for carbon steel. The results show that the value of Ecorr is between -0,9 and -1,1 V / SCE for ten days of diving. This means that there is an electrical contact between the zinc particles, which provides good cathodic protection for the steel substrate and most of the zinc particles were involved in the osmosis process. The good characteristics of the TTL-VN coating during immersion in a 3,5% NaCl solution can also be explained by the preservation of corrosive zinc products in the coating, which allows the creation of random barrier properties.

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