Studies on the redox behaviour of some polythiophene derivatives by impedance spectroscopy in symmetrical and asymmetrical configurations

Betova, Iva; Bojinov, Martin; Lankinen, Eeva; Sundholm, G.

doi:10.1016/s0022-0728(99)00254-5

Cited by 23 publications

(11 citation statements)

References 56 publications

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“…After pretreatment, the working and the Ir electrodes were brought in contact by the step motor driven system used in CER measurements [23,29]. The contact was opened only when the desired conditions (temperature and pressure) have been established in the autoclave.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…Such a configuration has been applied for the study of electroactive polymers by some of us [23] and also by others [24,25]. Recently, a combination between impedance measurements in an asymmetrical and a symmetrical configuration has been employed to characterise the conduction mechanism of the passive film on pure Fe [26], Fe-Cr and Fe-Cr-Mo alloys [27] in a borate so- [28,29] to the frequency domain [23,26,27]. The present paper focuses on the characterisation of the electrical and electrochemical properties of oxide films formed on Fe-Cr and Fe-Cr-Mo alloys in a borate electrolyte at 200 and 300°C using impedance spectroscopy in asymmetrical and symmetrical configurations.…”

Section: Introductionmentioning

confidence: 99%

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Conduction mechanism in oxide films on ferrous alloys studied by impedance spectroscopy in symmetrical and asymmetrical configurations

Betova

Bojinov

Kinnunen

et al. 2004

Journal of Electroanalytical Chemistry

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Section: Apparatus and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conduction mechanism in oxide films on ferrous alloys studied by impedance spectroscopy in symmetrical and asymmetrical configurations

Betova

Bojinov

Kinnunen

et al. 2004

Journal of Electroanalytical Chemistry

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“…Such a configuration has been applied for the study of wide variety of thin films [33][34][35]. Recently, a combination of impedance measurements in an asymmetrical and a symmetrical configuration has been employed to characterize the conduction mechanism of the passive film on pure Fe [36], Fe-Cr and Fe-Cr-Mo alloys [37] in a borate solution at room temperature.…”

Section: Symmetrical and Asymmetrical Configurations For In Situ Studmentioning

confidence: 99%

“…Recently, a combination of impedance measurements in an asymmetrical and a symmetrical configuration has been employed to characterize the conduction mechanism of the passive film on pure Fe [36], Fe-Cr and Fe-Cr-Mo alloys [37] in a borate solution at room temperature. The CEI measurements in the symmetrical configuration are an extension of the CER technique [38,39] to the frequency domain [33,36,37]. TLEC is used to measure the asymmetric configuration.…”

Section: Symmetrical and Asymmetrical Configurations For In Situ Studmentioning

confidence: 99%

“…Both criteria were checked by comparing the measured impedance spectra at gradually increasing contact pressure with the resistance measured by the CER technique, which is a fourpoint measurement method [32,33]. Both the low-frequency limit of the impedance and the CER-measured DC resistance have been found first to decrease rapidly with increasing contact pressure and than asymptotically to approach a value, which depends on the state of the oxide film.…”

Section: Validation Of the Measured Impedance Spectramentioning

confidence: 99%

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Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

Balachov¹,

Kobayashi²,

Tanzella³

et al. 2004

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REPORT DOCUMENTATION PAGEForm Approved OMB NO. Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and This work contributes to the design of safe and economical Generation-IV Super-Critical Water Reactors (SCWRs) by providing a basis for selecting structural materials to ensure the functionality of in-vessel components during the entire service life. During the second year of the project, we completed electrochemical characterization of the oxide film properties and investigation of crack initiation and propagation for candidate structural materials steels under supercritical conditions. We ranked candidate alloys against their susceptibility to environmentally assisted degradation based on the in situ data measured with an SRI-designed controlled distance electrochemistry (CDE) arrangement. A correlation between measurable oxide film properties and susceptibility of austenitic steels to environmentally assisted degradation was observed experimentally. One of the major practical results of the present work is the experimentally proven ability of the economical CDE technique to supply in situ data for ranking candidate structural materials for Generation-IV SCWRs. A potential use of the CDE arrangement developed at SRI for building in situ sensors for monitoring water chemistry in the heat transport circuit of Generation-IV SCWRs was evaluated and proved to be feasible. Understanding basic phenomena. Kinetic parameters of the charge and mass transport processes in the metal/oxide film/supercritical water system are derived from in situ oxide film studies to understand and quantify the rate-controlling processes and, eventually, the fundamentals of the metal oxidation phenomenon at supercritical temperatures. Providing a basis for the development of new alloys. Integration of the in situexperimental information on oxide film resistance to charge and mass transport for alloys of various compositions, along with fracture surface analysis and current theoretical understanding of the relationship between properties of the oxide films and stability of materials, is expected to aid in material selection and the development process. It will do so by providing recommendations for chemical compositions of the alloys in regard to their expected locations in the reactor (or more specifically, in regard to local temperature and oxidizing conditions). 1 WORK PERFORMED AND PRELIMINARY RESULTSDuring this project, SRI completed the electrochemical characterization of the oxide film prop...

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Charge Transport in Polymer‐modified Electrodes

Inzelt

2007

Encyclopedia of Electrochemistry

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The sections in this article are General Considerations Electron Transport Electron‐exchange Reaction Problems with the Verification of the Model Advanced Theories Predicting Nonlinear D ( c ) Function Transition between Percolation and Diffusion Behaviors Potential Dependence of Diffusion Coefficient Electronic Conductivity Ion Transport Coupling of Electron and Ionic Charge Transport Other Transport Processes Solvent Transport Dynamics of Polymeric Motion Film Structure and Morphology Thickness Synthesis Conditions, Nature of Electrolyte Effect of Electrolyte Concentration and Temperature Relaxation and Hysteresis Phenomena Measurements of the Rate of Charge Transport

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Studies on the redox behaviour of some polythiophene derivatives by impedance spectroscopy in symmetrical and asymmetrical configurations

Cited by 23 publications

References 56 publications

Conduction mechanism in oxide films on ferrous alloys studied by impedance spectroscopy in symmetrical and asymmetrical configurations

Conduction mechanism in oxide films on ferrous alloys studied by impedance spectroscopy in symmetrical and asymmetrical configurations

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

Charge Transport in Polymer‐modified Electrodes

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