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Journal articles on the topic 'Electrochemical impedance spectroscopy studies'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Pajkossy, Tamás, and Rafal Jurczakowski. "Electrochemical impedance spectroscopy in interfacial studies." Current Opinion in Electrochemistry 1, no. 1 (February 2017): 53–58. http://dx.doi.org/10.1016/j.coelec.2017.01.006.

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2

Maouche, Naima, and Belkacem Nessark. "Cyclic Voltammetry and Impedance Spectroscopy Behavior Studies of Polyterthiophene Modified Electrode." International Journal of Electrochemistry 2011 (2011): 1–5. http://dx.doi.org/10.4061/2011/670513.

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We present in this work a study of the electrochemical behaviour of terthiophene and its corresponding polymer, which is obtained electrochemically as a film by cyclic voltammetry (CV) on platinum electrode. The analysis focuses essentially on the effect of two solvents acetonitrile and dichloromethane on the electrochemical behaviour of the obtained polymer. The electrochemical behavior of this material was investigated by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The voltammograms show that the film of polyterthiophene can oxide and reduce in two solutions; in acetonitrile, the oxidation current intensity is more important than in dichloromethane. The impedance plots show the semicircle which is characteristic of charge-transfer resistance at the electrode/polymer interface at high frequency and the diffusion process at low frequency.

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3

Anseth, Ronnie, Nils-Olav Skeie, and Magne Waskaas. "Preliminary studies on monitoring fouling layers on a charged electrode using Electrical Impedance Spectroscopy." tm - Technisches Messen 85, no. 2 (February 23, 2018): 137–46. http://dx.doi.org/10.1515/teme-2017-0129.

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Abstract The objective of the study described in this paper was to examine whether fouling on an electrode surface can be monitored through impedance measurements using a modified Electrochemical Impedance Spectroscopy technique. The attempt was to evaluate a measurement system that could monitor fouling, within an electrochemical cell, by using EIS to find one single frequency to measure the impedance magnitude. An electrical potential difference was applied to the electrochemical cell to generate an electrical field to accelerate the deposition layer growth on one electrode. Experimental results show that the magnitude of the electrochemical cell impedance was in the range of 110 Ω over the duration of the experiment, which lasted one week. A measurable change in the impedance magnitude was detected when a deposition layer, caused by fouling, was present on one of the electrodes. The measurement frequency was selected specifically for the purpose to increase the deposition layer influence on the measured impedance magnitude, which was achieved by selecting a frequency that kept the capacitive reactance as low as possible. Results indicate that a measurement system, using one frequency, is capable of monitoring the deposition layer by measuring the magnitude of the electrochemical cell impedance.

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4

de Fiorio, D. Z. "Electrochemical Impedance Spectroscopy Studies of Perovskite/YSZ Ceramic Films." ECS Proceedings Volumes 2003-07, no. 1 (January 2003): 488–97. http://dx.doi.org/10.1149/200307.0488pv.

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5

Kowalska, M., K. Fabisiak, A. Wrzyszczyński, M. Szybowicz, and K. Paprocki. "Electrochemical Impedance Spectroscopy Studies of HF CVD Diamond Films." Acta Physica Polonica A 128, no. 2 (September 2015): 447–51. http://dx.doi.org/10.12693/aphyspola.128.447.

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6

Einati, Hila, Alexander Mottel, Alexandra Inberg, and Yosi Shacham-Diamand. "Electrochemical studies of self-assembled monolayers using impedance spectroscopy." Electrochimica Acta 54, no. 25 (October 2009): 6063–69. http://dx.doi.org/10.1016/j.electacta.2009.02.090.

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7

S. Patel, N., S. Jauhari, and G. N. Mehta. "Inhibitive Effect by Acid Extract of Ficus Exasperata Leaves on the Sulphuric Acid Corrosion of Mild Steel." E-Journal of Chemistry 6, s1 (2009): S189—S194. http://dx.doi.org/10.1155/2009/413421.

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Extract ofFicus exasperataleaves was investigated as corrosion inhibitor of mild steel in 1 N H2SO4using conventional weight loss, electrochemical polarizations, electrochemical impedance spectroscopy and scanning electron microscopic studies. The weight loss results showed that the extract ofFicus exasperatais excellent corrosion inhibitor. Electrochemical polarizations data revealed the mixed mode of inhibition. The results of electrochemical impedance spectroscopy shows that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. Scanning electron microscopic studies provided the confirmatory evidence of improved surface condition, due to the adsorption, for the corrosion protection.

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8

Wang, Hong Fang, Jiang Chun Hu, and Zhen Xia Yuan. "The Mathematical Foundation of Rock Electrochemical Impedance Spectroscopy." Advanced Materials Research 446-449 (January 2012): 1703–8. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1703.

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The electromagnetic characteristics of rock and ore play an important role in resources, engineering and environmental fields. The high frequency part of rock electrochemical impedance spectroscopy can reveal its crack characteristics according to the test results and rock physical model and equivalent circuit. The mathematical foundation of high frequency part of rock electrochemical impedance spectroscopy is studied, and the ideal Nyquist figure is obtained from that, and the response characteristics of rock electrochemical impedance spectroscopy volume arc are been proofed. It provides the theory basis for further study rock electrochemical detection technology.

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9

Stockert, L., and B. Huber. "Corrosion Studies on Anodized Aluminum Alloys by Electrochemical Impedance Spectroscopy." Materials Science Forum 111-112 (January 1992): 281–90. http://dx.doi.org/10.4028/www.scientific.net/msf.111-112.281.

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10

Taberna, P. L., P. Simon, and J. F. Fauvarque. "Electrochemical Characteristics and Impedance Spectroscopy Studies of Carbon-Carbon Supercapacitors." Journal of The Electrochemical Society 150, no. 3 (2003): A292. http://dx.doi.org/10.1149/1.1543948.

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11

Zabara, Mohammed Ahmed, Can Berk Uzundal, and Burak Ulgut. "Linear and Nonlinear Electrochemical Impedance Spectroscopy Studies of Li/SOCl2Batteries." Journal of The Electrochemical Society 166, no. 6 (2019): A811—A820. http://dx.doi.org/10.1149/2.1231904jes.

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12

Xu, Fei Ran, Sheng Tao Zhang, and Xiao Li. "Corrosion Inhibition of 45# Mild Steel in Acidic Solution by Some Norfloxacin." Advanced Materials Research 194-196 (February 2011): 44–51. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.44.

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The corrosion inhibition of 45# mild steel in 3%HCL solution by norfloxacin has been studied by weight loss measurement, Tafel polarization, electrochemical impedance spectroscopy (EIS) and quantum chemical study. The inhibitor of norfloxacin shows 93.2% inhibition efficiency at optimum concentration 400mg/L. The polarization studies suggest that norfloxacin is the mixed-type inhibitor for 45# carbon steel in 3%HCL. Electrochemical impedance spectroscopy techniques are also used to investigate the mechanism of corrosion inhibition. What is more, the adsorption model obeys Langmuir adsorption isotherm at 298K. And the calculated quantum chemical also suggests that norfloxacin have excellent inhibition properties.

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13

Refugio-García, Elizabeth, Gerardo Vázquez-Huerta, José Miranda-Hernández, Jessica Osorio-Ramos, José Rodríguez-García, and Enrique Rocha-Rangel. "Mechanical and Chemical Studies of Al2O3-Ti Composites for Their Use as a Bone Substitute." Chemistry & Chemical Technology 15, no. 4 (November 25, 2021): 591–98. http://dx.doi.org/10.23939/chcht15.04.591.

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Alumina-based composites reinforced with titanium were manufactured by powder techniques. Characterizations indicate that titanium content affects densification which in turn causes positive effects on hardness and toughness. Microstructure presents grains of irregular shape and small sizes. Electrochemical impedance spectroscopy indicates that additions of titanium on Al2O3 enhance its corrosion resistance.

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14

Jung, JongSeok, Haena Yim, Narendra Singh Parmar, Jae-Seung Lee, and Ji-Won Choi. "Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials." Coatings 9, no. 6 (June 4, 2019): 366. http://dx.doi.org/10.3390/coatings9060366.

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Many scientific efforts have been undertaken toward reducing the Co content in LiMn1/3Ni1/3Co1/3O2 cathode materials for thin-film batteries. In this study, we present cathodes with a wide range of Li(Ni, Mn, Co)O2 compositions to determine the material with the best electrochemical performance by changing the ratio of Ni to Mn at a fixed 0.1 at.% of Co by the continuous composition spread sputtering method. The cathode composition measurements by Rutherford backscattering spectroscopy show that the best electrochemical performance is obtained for a composition of Ni:Mn:Co = 19:71:10. The reasons for this improved electrochemical performance are further investigated by X-ray diffraction, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, and X-ray absorption near edge spectroscopy.

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15

Gerengi, Husnu. "The Use of Dynamic Electrochemical Impedance Spectroscopy in Corrosion Inhibitor Studies." Protection of Metals and Physical Chemistry of Surfaces 54, no. 3 (May 2018): 536–40. http://dx.doi.org/10.1134/s2070205118030267.

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16

Fernández-Sánchez, César, Calum J. McNeil, and Keith Rawson. "Electrochemical impedance spectroscopy studies of polymer degradation: application to biosensor development." TrAC Trends in Analytical Chemistry 24, no. 1 (January 2005): 37–48. http://dx.doi.org/10.1016/j.trac.2004.08.010.

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17

Shin, Dong-Myeong, Jong-ryul Choi, Jin-Woo Oh, Hyung Kook Kim, Dong-Wook Han, Kyujung Kim, and Yoon-Hwae Hwang. "Exploring the use of impedance spectroscopy in relaxation and electrochemical studies." Applied Spectroscopy Reviews 53, no. 2-4 (June 8, 2017): 157–76. http://dx.doi.org/10.1080/05704928.2017.1328425.

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18

Johnson, B. J., D. H. Doughty, J. A. Voigt, and T. J. Boyle. "Electrochemical impedance spectroscopy studies of lithium diffusion in doped manganese oxide." Journal of Power Sources 68, no. 2 (October 1997): 634–36. http://dx.doi.org/10.1016/s0378-7753(96)02636-5.

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19

Pleskov, Yu V., Yu E. Evstefeeva, M. D. Krotova, V. V. Elkin, A. M. Baranov, and A. P. Dement'ev. "Electrochemical behavior of amorphous carbon films: kinetic and impedance-spectroscopy studies." Diamond and Related Materials 8, no. 1 (January 1999): 64–72. http://dx.doi.org/10.1016/s0925-9635(98)00367-7.

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20

Osman, Z., N. H. Zainol, S. M. Samin, W. G. Chong, K. B. Md Isa, L. Othman, I. Supa’at, and F. Sonsudin. "Electrochemical Impedance Spectroscopy Studies of Magnesium-Based Polymethylmethacrylate Gel Polymer Electroytes." Electrochimica Acta 131 (June 2014): 148–53. http://dx.doi.org/10.1016/j.electacta.2013.11.189.

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21

Sun, Qi Lei, Li Zhang, Jie Dong, and Lu Hua He. "Study on Electrochemical Behavior of Prestressed Reinforcement in Simulated Concrete Solution." Applied Mechanics and Materials 357-360 (August 2013): 917–20. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.917.

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Using electrochemical impedance spectroscop (EIS) and polarization curve technique, the electrochemical behavior of prestressed reinforcement under different stress levels was studied in simulated concrete solution. The results show that: As the stress increasing, the impedance spectroscopy changes significantly, the entire impedance spectroscopy shows an elongated semi-circular deformation, high-frequency capacitance arc radius corrosion decreases with the corrosion progress, in other words, the reaction resistance decreases, the corrosion rate of the sample increases. And when the galvanized steel is in 1064MPa stresss condition, corrosion current density reaches the maximum, is 9 times larger than that of none stress corrosions condition. Under the combined effects of the external stress and corrosive media, dislocation can be emitted, value-added and moves. When it reached a critical state, it would lead to the crack nucleation of Stress corrosion cracking (SCC).

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22

Cheruvathur, Sini Varghese, Joby Thomas Kakkassery, Vinod Raphael Palayoor, Binsi M. Paulson, and Ragi Kooliyat. "Electrochemically Synthesized Poly(2-Aminobenzenesulphonic Acid) – An Efficient Protection for Carbon Steel Corrosion." Oriental Journal of Chemistry 35, no. 2 (April 24, 2019): 678–83. http://dx.doi.org/10.13005/ojc/350223.

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The corrosion protection efficacy of electrochemically synthesized poly(2-aminobenzenesulphonic acid) (P2ABSA) on carbon steel in 1.0 M HCl was investigated by electrochemical impedance spectroscopy, Tafel polarisation, scanning electron microscopy (SEM) and FT-IR spectral studies. The polymeric coating was prepared on the steel surface using cyclic voltammetry. Investigations established that P2ABSA effectively prevent the metal dissolution in HCl medium. Polarisation studies revealed that this polymer hinder both anodic and cathodic process of corrosion appreciably. The structures of the chemically and electrochemically synthesised polymers were compared using IR spectroscopy. Morphology of the steel surface confirmed the intact response of P2ABSA on steel surface treated with HCl.

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23

Dudzik, K., and W. Jurczak. "Influence of Friction Stir Welding on Corrosion Properties of Aw-7020M Alloy in Sea Water." Advances in Materials Science 15, no. 1 (March 1, 2015): 7–13. http://dx.doi.org/10.1515/adms-2015-0002.

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Abstract Friction Stir Welding (FSW), provides an alternative to MIG and TIG welding methods for joining aluminium alloys. The article presents the results of electrochemical corrosion resistance test of alloy AW- 7020M and its joints welded by FSW. The study was performed using the method of electrochemical impedance spectroscopy (EIS). Impedance spectroscopy studies showed that both, the FSW welded joint and base material AW-7020M has a good resistance to electrochemical corrosion in sea water environment, wherein the welded joint has a higher susceptibility to this type of corrosion. Research has indicated the desirability of applying the FSW method for joining AW-7020M alloy in shipbuilding industry.

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24

Zhang, Rui Jin, Hui Lin Yang, and Da Yong Ye. "Electrochemical Studies on the Corrosion of Steel Bar in Concrete in Chloride Environment." Advanced Materials Research 631-632 (January 2013): 776–81. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.776.

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This paper deals with the influence of the steel-concrete interface quality on the steel bar corrosion. Electrochemical methods including linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) were comparatively used to monitor the corrosion process of reinforcing steel in cement mortar. Experimental results show that a good quality of steel-concrete interface can significantly delay the corrosion initiation and reduces the corrosion rate. The results highlight the reasonable correlation between the impedance response and the Rp values by LPR method, but the corrosion rates obtained by EIS are lower than those results of LPR.

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25

Ganesan, Akash, Tawanda J. Zimudzi, and Derek M. Hall. "Characterizing Working Electrodes for in-Operando Spectroelectrochemical Cells Using Electrochemical Impedance Spectroscopy." ECS Meeting Abstracts MA2022-02, no. 1 (October 9, 2022): 92. http://dx.doi.org/10.1149/ma2022-02192mtgabs.

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Increasing interest in spectroelectrochemisty due to its versatility and far-reaching applications has led to its rapid growth in recent years. Attenuated total reflectance (ATR), Fourier transform infrared spectroscopy (FTIR) is one technique that can provide valuable insights into surface interactions provided a viable working electrode can be fabricated. Though ATR working electrodes can be deposited using a range of techniques such as argon sputtering, vapor deposition and electrodeposition, published studies typically do not report electrode thicknesses which are a key in obtaining repeatable signal responses. Here we examine different approaches to quantify ATR electrode thicknesses and screen for optimal electrode configurations. The test system used to assess different approaches for validating electrode performance was the ferri-ferrocyanide redox reaction with an argon sputtered platinum surface. It was found that atomic force microscopy, ellipsometry and optical profilometry had practical limitations operating in the nanometer range and were not adequate for predicting spectroscopic outcomes. In contrast, electrochemical impedance spectroscopy (EIS) measurements accurately predicted high performing ATR working electrodes. For an 11 mm by 9 mm ATR wafer, favorable signal strengths corresponded to cell impedances greater than 500 Ω. Cell constant calculations determined that platinum thickness layers needed to be less than 4 nm to provide consistent spectroelectrochemical responses.

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26

Zhang, Xiu Zhi, and Yuan Long Du. "Effects of Immersion Time on the Electrochemical Impedance Spectroscopy Model of Epoxy Coating Modified by Nano-Sized Titanium." Advanced Materials Research 139-141 (October 2010): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.43.

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In this paper, the effects of immersion time on the electrochemical impedance spectroscopy model of nano-sized titanium modified epoxy coating immersed in 3.5(wt.%) sodilum chloride solution has been studied using electrochemical impedance spectroscopy(EIS). Through the analysis of the spectra of the coating at different immersion times, the results showed that the spectrum was different at the different immersion times. Therefore, the equivalent electrical circuit was varied with the increasing immersion time and there were the characteristics of the powder in the equivalent electrical circuits (electrochemical impedance spectroscopy model). By the study on the evlolution of impedance model in the given system, it was found that the nano-sized powder played an important part during the electrolyte diffusing to the surface of the substrate and the electrolyte reacting with the substrate

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27

Murulana, Lutendo C., Mwadham M. Kabanda, and Eno E. Ebenso. "Experimental and theoretical studies on the corrosion inhibition of mild steel by some sulphonamides in aqueous HCl." RSC Advances 5, no. 36 (2015): 28743–61. http://dx.doi.org/10.1039/c4ra11414k.

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Corrosion inhibition studies of mild steel in aqueous HCl by some sulphonamides have been investigated using weight loss, potentiodynamic polarization (PDP), Electrochemical Impedance Spectroscopy (EIS) and Density Functional Theory (DFT).

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28

Diamant, Viktor. "MODERN RESEARCH METHODS OF PHYSICOCHEMICAL AND ELECTROCHEMICAL PROPERTIES OF ELECTROLYTES IN FOR Li-ION BATTERIES AND HYBRID SUPERCAPACITIES." Ukrainian Chemistry Journal 87, no. 6 (July 26, 2021): 82–96. http://dx.doi.org/10.33609/2708-129x.87.06.2021.82-96.

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In review examineі base properties of modern non-aqueous electrolytes for li-ion batteries and hybrid supercapacities taking part in the formation of power density, electrochemical and thermal stability. Discussed such aspects as the electrolytes functions in electrochemical power sources, physicochemical and electrochemical properties of electrolytes for supercapacitors, the physicochemical and electrochemical properties of electrolytes for primary and secondary batteries, and methods of electrolytes research. As the base methodі for electrolytes studies considered: electrochemical impedance spectroscopy, voltammetry, amperometry, viscosimetry, and combined Ramman spectroscopy.

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29

Nofrizal, Nofrizal. "Gambir Extract As A Corrosion Inhibitor For Mild Steel In Acidic Solution." Scientific Contributions Oil and Gas 35, no. 3 (March 10, 2022): 139–45. http://dx.doi.org/10.29017/scog.35.3.786.

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The inhibition infl uence of Gambir extract in 1M Hidrocloric Medium on corrosion of mild steel in acidic solution was studied by weight loss measurements, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM method. It is believed that the phenolic compounds that contained in the Gambir extract in 1 M Hidrocloric medium to be responsible for the inhibition. The corrosion studies shows that Gambir extract gives an anodic type of inhibition and best at the concentration of 150 ppm. The inhibition effi ciency for weight loss measurement, potentiodynamic polarization measurement, and electrochemical impedance spectroscopy were 76.52, 88.28 and 66.27% respectively. SEM analysis shows that the morphology of inhibited mild steel was improved compared with uninhibited mild steel.

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30

Mahendra, Antony, and Zainul Arifin Imam Supardi. "SEBUAH REVIEW: SPEKTROSKOPI IMPEDANSI ELEKTROKIMIA DAN APLIKASINYA DALAM BATERAI LITHIUM-ION." Inovasi Fisika Indonesia 10, no. 2 (July 5, 2021): 59–67. http://dx.doi.org/10.26740/ifi.v10n2.p59-67.

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Abstrak Dengan meningkatnya kebutuhan bahan penyimpan energi, baterai rechargeable lithium ion menjadi obyek yang banyak dipelajari. Banyak metoda yang digunakan untuk menyelidiki karakteristik elektrokimia dari baterai, salah satunya adalah Electrochemical Impedance Spectroscopy (EIS). Dengan EIS, informasi dari hubungan state of charge pada siklus tertentu baterai dengan resistansi elektrolit, resistansi film permukaan dan resistansi transfer muatan didapatkan dengan menggunakan rangkaian ekivalen yang sesuai dengan plot Nyquist. Pada artikel ini, perbandingan antara hasil karakterisasi EIS katoda LiCoO2 dan LiNi1/3Co1/3Mn1/3O2 dalam baterai lithium ion juga dipaparkan berdasarkan laporan dari penelitian yang pernah dilakukan para peneliti sebelumnya. Telah dilaporkan bahwa nilai DLi+ dari LiCoO2 lebih besar daripada LiNi1/3Co1/3Mn1/3O2, dan nilai j0 dari LiNi1/3Co1/3Mn1/3O2 lebih besar dari pada LiCoO2. Kata Kunci: Electrochemical Impedance Spectroscopy (EIS), Plot Nyquist, Baterai Lithium Ion, State of Charge Abstract With increasing need for energy storage materials, rechargeable lithium ion battery become an object that is much studied. There are many methods that used to investigate electrochemical characteristic of battery, one of them is Electrochemical Impedance Spectroscopy (EIS). With the EIS, informations about relation between state of charge at some certain cycle of battery with electrolyte resistance, surface film resistance, and charge transfer resistance are obtained with modeling equivalent circuit according to the Nyquist plots. In tis article, a comparison between the results of EIS characterization of cathode LiCoO2 and LiNi1/3Co1/3Mn1/3O2 in lithium ion battery is presented based on report studies that have been conducted by previous researcher. It has been reported that DLi+ value of cathode LiCoO2 is greater than DLi+ value of cathode LiNi1/3Co1/3Mn1/3O2, and j0 value of cathode LiNi1/3Co1/3Mn1/3O2 is greater than j0 value of cathode LiCoO2. Keywords: Electrochemical Impedance Spectroscopy (EIS), Nyquist Plot, Lithium Ion Battery, State of Charge

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31

ZENG, A., E. LIU, P. HING, S. ZHANG, S. N. TAN, I. F. ANNERGREN, and J. GAO. "MICROSTRUCTURE AND ELECTROCHEMICAL BEHAVIOR OF SPUTTERED DIAMOND-LIKE CARBON FILMS." International Journal of Modern Physics B 16, no. 06n07 (March 20, 2002): 1024–30. http://dx.doi.org/10.1142/s0217979202010804.

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Diamond-like carbon (DLC) films with different structure were deposited on highly electrically conductive silicon substrates (SiO2/Si), using dc magnetron sputtering deposition process. Their structure and electrochemical behavior in 0.5 M H 2 SO 4 solution were studied with micro-Raman spectroscopy, electrochemical impedance spectroscopic (EIS) analysis and film impedance. The double layer capacitance on the DLC films was about 0.571 - 3.91 μ F-cm -2. The capacitance increased with the increased Raman spectrum intensity ratio I D / I G and accelerated at around 2.25 of the ratio. The results suggest that the potential of DLC films as electrode materials for electrochemical analysis.

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32

Dudzik, Krzysztof, and Adam Charchalis. "EIS Research of AW-7020 Alloy Joints Welded by FSW." Solid State Phenomena 199 (March 2013): 412–17. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.412.

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The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by friction stir welding FSW were presented. Friction Stir Welding (FSW) a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. In the article the parameters for friction stir welding of sheets made of AlZn5Mg1 (7020) alloy was presented. The study was carried out in accordance with the requirements of the ASTM G 106. EIS measurement was performed in three electrode system in an artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range ± 10 mV and frequency range of changes was as follows: 100 kHz - 0.1 Hz. Atlas 0531 EU & IA potentiostat was used for studies. The results of electrochemical impedance spectroscopy are presented in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed. The electrochemical impedance spectroscopy studies have shown that the joint welded by FSW has better electrochemical corrosion resistance than the native material - AW-7020 alloy. Original value are received results of the corrosion properties of new method friction stir welded AlZn5Mg1 alloy compared with the native material.

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33

Vanysek, Petr. "Visualizing Impedance Spectroscopy Response for Interpretation of Collected Data." ECS Transactions 105, no. 1 (November 30, 2021): 109–18. http://dx.doi.org/10.1149/10501.0109ecst.

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Measurements and interpretation of electrical impedance in electrochemistry and in related studies has become recently fairly commonplace as both the hardware and the interpretation software are more and more standard part of electrochemical potentiostats. With the interpretation software it is possible to model the studied system in any conceivable way, even if the physical reality may not follow the chosen model. An example is given where a circuit consisting of a capacitor with resistors in series and parallel are evaluated as if the circuit were just a pure capacitor. The method of plotting the results as complex permittivity and complex modulus is also shown.

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34

Ben Aoun, Sami. "On the corrosion inhibition of carbon steel in 1 M HCl with a pyridinium-ionic liquid: chemical, thermodynamic, kinetic and electrochemical studies." RSC Advances 7, no. 58 (2017): 36688–96. http://dx.doi.org/10.1039/c7ra04084a.

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The corrosion inhibition efficiency of 1-hexylpyridinium bromide for carbon steel in molar hydrochloric acid has been investigated by gravimetric, linear polarization, electrochemical impedance spectroscopy and scanning electron microscopy techniques.

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35

Vendrell, Xavier, Yuri Kubyshin, Lourdes Mestres, and Jordi Llorca. "CO Oxidation on Ceria Studied by Electrochemical Impedance Spectroscopy." ChemCatChem 12, no. 23 (October 13, 2020): 5926–31. http://dx.doi.org/10.1002/cctc.202001389.

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36

Krasnikova, Irina V., Mariam A. Pogosova, Alexey O. Sanin, and Keith J. Stevenson. "Toward Standardization of Electrochemical Impedance Spectroscopy Studies of Li-Ion Conductive Ceramics." Chemistry of Materials 32, no. 6 (February 21, 2020): 2232–41. http://dx.doi.org/10.1021/acs.chemmater.9b04899.

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37

Prasad, K. Rajendra, and N. Munichandraiah. "Electrocatalytic efficiency of polyaniline by cyclic voltammetry and electrochemical impedance spectroscopy studies." Synthetic Metals 126, no. 1 (January 2002): 61–68. http://dx.doi.org/10.1016/s0379-6779(01)00496-9.

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38

Miandari, Somaieh, Majid Jafarian, Mohammad Ghasem Mahjani, and Ashraf Heidaripour. "Photo-electrochemical Studies by AC Impedance Spectroscopy on Electrodeposited n-Type PbS." Bulletin of the Chemical Society of Japan 88, no. 1 (January 15, 2015): 209–16. http://dx.doi.org/10.1246/bcsj.20140257.

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39

Szwacki, J., A. Lisowska-Oleksiak, and M. Szpakowska. "Polymer membranes loaded with lipids for taste sensing: electrochemical impedance spectroscopy studies." Desalination 198, no. 1-3 (October 2006): 1–7. http://dx.doi.org/10.1016/j.desal.2006.09.002.

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Zhuang, Quanchao, Zuofeng Chen, Quanfeng Dong, Yanxia Jiang, Ling Huang, and Shigang Sun. "Studies of the first lithiation of graphite materials by electrochemical impedance spectroscopy." Chinese Science Bulletin 51, no. 9 (May 2006): 1055–59. http://dx.doi.org/10.1007/s11434-006-1055-y.

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Labusch, Lutz, Claas Müller, and Holger Reinecke. "Qualification of ECM-Processes by Electro Impedance Spectroscopy." Key Engineering Materials 611-612 (May 2014): 739–45. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.739.

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Electrochemical machining (ECM) is an appropriate technology for structuring a wide range of metals and alloys independent of their mechanical properties. Further advantages the occurence of no tool wear and almost no change in the material properties of the work piece material due to the machining. As different studies showed it is possible to manufacture structures in the µm-range and also in the sub µm-range. The resulting geometry and feature size depend on the electrolyte, the working gap, the electric field, the flow conditions within the working gap and the material structure. The working gap is the most important parameter regarding the critical dimensions of ECM. Actual high resolution processes are limited by the process time due low current densities, while faster processes are limited by the resolution due to the dimensions of the double layer and the need for purging.\\Regarding these limits an enhanced understanding of the electrochemical processes within the working gap is mandatory for the optimization of the ECM. Therefore a measurement device is realised utilising electrochemical impedance spectroscopy (EIS), which is one technique to obtain a wide set of thermodynamic and kinetic parameters related to the electrochemical processes like reactions, adsorption, desorption and diffusion in the gap. There the impedance, which is the complex ratio between the voltage and the current in an AC circuit, is measured as a function of the frequency and it is compared to an equivalent circuit, composed out of basic elements representing the chemical sub processes. The spectrometer is realized by combining a commercial potentiostat with computer based signal processing realized in MATLAB\copyright. The spectrometer implements time-domain measurement techniques (Fourier transformation) for a strong reduction of measurement time. This time reduction allows in situ measurements.\\The presented spectrometer enables characterization of standard material systems like cooper, as well as the identification of the time-critical chemical processes and steps in more complex systems.

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McGrogan, Frank P., Sean R. Bishop, Shilpa Raja, Yet-Ming Chiang, and Krystyn J. Van Vliet. "Effect of Electrochemically Induced Fracture and Fatigue on Capacity and Kinetics of Li_XMn₂O₄." ECS Meeting Abstracts MA2018-01, no. 32 (April 13, 2018): 1958. http://dx.doi.org/10.1149/ma2018-01/32/1958.

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Li-ion battery (LIB) electrodes suffer from gradual performance loss during repeated electrochemical cycling. The battery community has identified a variety of mechanical and chemical degradation routes leading to capacity fade in LIBs, including fracture of the active electrode particles driven by cycling-induced chemomechanical stress. However, the detailed mechanisms by which this fracture due to electrochemical cycling – or electrochemomechanical fatigue – promotes capacity fade and impedance growth are not understood completely even in the most well studied positive electrode systems. Here, we demonstrate this connection between fracture, capacity, and impedance growth in LiXMn2O4 cathodes via complex cycling schedules designed to produce discrete fracture events. We implement variations in current and potential to control fracture by electrochemical means, confirmed with in situ acoustic emissions monitoring and post-mortem electron microscopy. We use electrochemical impedance spectroscopy and distribution of relaxation times analysis to identify the physical contributions to electrochemical impedance, and find that fracture causes an immediate increase in electronic contact resistance by creating insulating interfaces in the bulk of the electrode. We also observe an onset of severe capacity fade concurrent with electrochemically induced fracture, indicating that fracture plays a role in accelerating dissolution reactions that compromise battery cathode performance. Thus, we identify two distinct degradation mechanisms acting separately on capacity and impedance over two different time scales. The separation of these performance-reducing effects in a well-studied cathode material is critical to understanding the coupling between electrochemical and mechanical degradation in LIBs.

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Wu, Jiedu, Ruyu Zhou, Petar M. Radjenovic, Shuai Liu, Deyin Wu, Jianfeng Li, Bingwei Mao, and Jiawei Yan. "Electrochemical impedance spectroscopy and Raman spectroscopy studies on electrochemical interface between Au(111) electrode and ethaline deep eutectic solvent." Electrochimica Acta 390 (September 2021): 138859. http://dx.doi.org/10.1016/j.electacta.2021.138859.

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Huang, Dong-Lan, Jian Wang, Hui-Qing Yuan, Hui-Shi Guo, Xiao Ying, Hao Zhang, and Hai-Yang Liu. "Noncovalently copper-porphyrin functionalized reduced graphene oxide for sensitive electrochemical detection of dopamine." Journal of Porphyrins and Phthalocyanines 22, no. 09n10 (August 21, 2018): 853–62. http://dx.doi.org/10.1142/s1088424618500761.

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The nanocomposite of an electron-deficient flat tetrakis-(ethoxycarbonyl) porphyrin copper(II) (Cu-TECP) and reduced grapheme oxide (RGO) was prepared and used for electrochemical detection of dopamine (DA). The prepared nanocomposite was characterized by scanning electron microscopy, Raman spectroscopy, FT-IR spectroscopy, ultraviolet-visible spectroscopy and electrochemical impedance spectroscopy. Electrochemical studies of the modified glass carbon electrode (GCE) were carried out by the cyclic voltammetry and differential pulse voltammograms (DPV) methods. The RGO/Cu-TECP/GCE exhibited enhanced electrocatalytic activity towards the detection of dopamine (DA). The detection limit was 0.58 μM, while the linear range was from 2 to 200 μM ([Formula: see text] 0.997).

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Kulkarni, Prateek, Charitha B. Ponnappa, Partha Doshi, Padmalatha Rao, and Seetharaman Balaji. "Lignin from termite frass: a sustainable source for anticorrosive applications." Journal of Applied Electrochemistry 51, no. 10 (July 13, 2021): 1491–500. http://dx.doi.org/10.1007/s10800-021-01592-8.

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AbstractThe present study reports a sustainable source of lignin, from termite frass. Lignin was extracted using Klason’s method and subjected to polarization studies to check the inhibition efficiency and measured the electrochemical performance of the coated sample on the carbon steel using electrochemical impedance spectroscopy. The anticorrosive property was determined in a simulated corrosive environment (0.1 M NaOH and 0.5 M NaOH). The morphological analysis of the surface of both bare metal and the lignin-coated ones, before and after exposure to the corrosive environment, was recorded using atomic force microscopy (AFM), scanning electron microscopy (SEM), and energy-dispersive X-Ray spectroscopy (EDX). The lignin showed maximum inhibition efficiency at 600 ppm in 0.5 M NaOH solution. Moreover, the lignin coated on carbon steel exhibited about 70% corrosion inhibition efficiency as recorded by potentiodynamic polarization studies and electrochemical impedance spectroscopy. The AFM and SEM analyses further corroborated the protection of the metal surface from corrosion when coated with lignin. Hence, the study suggests lignin from termite frass as a sustainable biological source suitable for anticorrosive applications. Graphic abstract

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Gál, Miroslav, Romana Sokolová, Viliam Kolivoška, Andrea Morovská Turoňová, Marta Ambrová, and Ján Híveš. "Metronidazole radical anion formation studied by means of electrochemical impedance spectroscopy." Collection of Czechoslovak Chemical Communications 76, no. 12 (2011): 1607–17. http://dx.doi.org/10.1135/cccc2011113.

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Radiosensitizers belong to the most important class of the cancerostatic drugs. The electrochemical transfer of the first electron to the cytotoxic radiosensitizer Metronidazole (MET) and MET radical anion formation in aprotic medium was studied by means of electrochemical impedance spectroscopy. The heterogeneous electron transfer rate constant for the first reduction of MET (radical anion production) k0 for the redox couple was determined. Similarly, the diffusion coefficient of MET in dimethylformamide was also calculated by impedance measurements using expression for Warburg coefficient and Warburg plot. Moreover, the equivalent circuit for the redox couple MET/MET•– was proposed and its parameters were evaluated using a non-linear least square fitting. Our results, from the electrochemical point of view, also confirm the suitability of MET for the effective treatment of selected types of the cancer.

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Say, Wen Ching, Chen Chang Chan, Jin Shyong Lin, Chien Chon Chen, Alex Fang, and Shih Hsun Chen. "Impedance Studies of Thermochemically Activated 316L Stainless Steel." Atlas Journal of Materials Science 2, no. 2 (June 14, 2017): 73–77. http://dx.doi.org/10.5147/ajms.v2i2.127.

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This study proposed a novel thermochemical activation (TCA) method to modify the surface of 316L stainless steel (SS). At the first stage, phosphate ions were introduced to 316L SS surface by a heat-diffusion process. After rapid quenching into calcium citrate solution, calcium and hydroxide ions were sealed in the TCA compound layer. The TCA and original 316L SS were immersed in Hanks’ solution to evaluate their biocompatibility. Electrochemical impedance spectroscopy analysis showed that the surface active compound layer affected the TCA 316L SS, and its total impedances of Bode and Nyquist plots were higher than that of the original ones during immersed in Hank’s from 1 to 14 days. After TCA treatment, the corrosion resistance increased greatly, and thus reducing the release of ions from stainless steel, such as Fe, Cr, Ni and Mo. In the Ca- and P-rich areas, the ions were guided to deposit in the Hanks’ solution, forming bone-like hydroxyl apatite. The treatment has been proven to reduce the ionic release from 316L SS, which is considered to be a great improvement for implanted alloys.

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Adindu, Chinonso Blessing, Emeka Emmanuel Oguzie, and Cynthia E. Ogukwe. "Corrosion Inhibition of Mild Steel in 0.5 M H₂SO₄ Using Ethanol Extract of Funtumia elastica." International Letters of Chemistry, Physics and Astronomy 68 (July 2016): 24–38. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.68.24.

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The adsorption and corrosion inhibitive effect of the ethanol extract ofFuntumia elastica(FE) leaves on mild steel corrosion in 0.5 M H2SO4was studied using gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopic techniques. As well as Fourier transform infrared spectroscopy and computational methods. The gravimetric and electrochemical studies revealed that FE is an adsorption inhibitor. The potentiodynamic polarization result showed that the inhibitor is a mixed type corrosion inhibitor for mild steel in 0.5 M H2SO4, inhibiting both the cathodic and anodic partial reactions. Density functional theory calculations were performed to model the electronic structures of some selected extract constituents (conessine, and ascorbic acid) to conﬁrm their inhibiting potential and established their individual contributions to the observed inhibiting effects.

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Sroka, M., E. Jonda, M. Węglowski, and S. Błacha. "The Corrosion Studies of Electron Beam Welded Nickel Alloy." MATEC Web of Conferences 253 (2019): 03005. http://dx.doi.org/10.1051/matecconf/201925303005.

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The paper presents the influence of electron - beam (EB) remelting effect on the surface layer electrochemical parameters obtained from potentiodynamic anodic polarization studies and impedance spectroscopy measurements for a set of Inconel 617 electron beam remelted obtained for different process parameters. The correlation between EBW process parameters and characteristic of surface oxide layer properties and resistance to the acidic environment were discussed. The electrochemical studies were supported by microstructural analysis of the remelted zone (RZ), heat affected zone (HAZ), native metal and observed precipitates formed under rapid solidification process. Both electrochemical technics applied to evaluate corrosion properties of remelted Inconel 617 evidenced a strong influence of the electron beam current on the corrosion resistance.

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Zhang, Wenjuan, Wei Cheng, Ramato Ashu Tufa, Caihong Liu, David Aili, Debabrata Chanda, Jing Chang, Shaopo Wang, Yufeng Zhang, and Jun Ma. "Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH." Membranes 11, no. 10 (October 10, 2021): 771. http://dx.doi.org/10.3390/membranes11100771.

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Ion-exchange membranes (IEMs) represent a key component in various electrochemical energy conversion and storage systems. In this study, electrochemical impedance spectroscopy (EIS) was used to investigate the effects of structural changes of anion exchange membranes (AEMs) on the bulk membrane and interface properties as a function of solution pH. The variations in the physico/electrochemical properties, including ion exchange capacity, swelling degree, fixed charge density, zeta potentials as well as membrane and interface resistances of two commercial AEMs and cation exchange membranes (CEMs, as a control) were systematically investigated in different pH environments. Structural changes of the membrane surface were analyzed by Fourier transform infrared and X-ray photoelectron spectroscopy. Most notably, at high pH (pH > 10), the membrane (Rm) and the diffusion boundary layer resistances (Rdbl) increased for the two AEMs, whereas the electrical double layer resistance decreased simultaneously. This increase in Rm and Rdbl was mainly attributed to the deprotonation of the tertiary amino groups (-NR2H+) as a membrane functionality. Our results show that the local pH at the membrane-solution interface plays a crucial role on membrane electrochemical properties in IEM transport processes, particularly for AEMs.

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