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Renaud Bouchet - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical impedance spectroscopy of a Li–S battery: Part 2. Influence of separator chemistry on the lithium electrode/electrolyte Interface
Electrochimica Acta, 2017Co-Authors: Joanna Conder, Sigita Trabesinger, Lorenz Gubler, Claire Villevieille, Petr Novák, Renaud BouchetAbstract:Abstract Asymmetric separators with polysulfide barrier properties, consisting of porous polypropylene (PP) grafted with styrene sulfonate (SS), PP-g-PLiSS, were characterized in symmetric Li/Li cells using electrochemical impedance spectroscopy to investigate the influence of separator chemistry on the Li electrode/electrolyte Interface. The symmetric Li/Li cell approach was found to be applicable for probing the transport properties of the separator and, therefore, determining the role of the functionality added to the separator. Electrolyte resistance and the formation of a surface film on metallic Li were both monitored as functions of time and the concentration of cation-exchange groups introduced at and near the surface of one side of the separator (expressed as the graft level). No continuous build-up of Li electrode/electrolyte Interface resistance was observed, indicating that the addition of a cation-exchange layer did not hinder entirely Li-ion transport through the separator. In addition, the microstructures of the separators were reconstructed based on focused ion beam/scanning electron microscopy tomography to determine the effective ionic conductivity and effective tortuosity of the PP-g-PLiSS separators. These values showed that ion mobility within the separator changed with increasing graft level, indicating that the concentration of SS groups and bulk porosity of the separator have to be adjusted to maintain the effective conductivity at a practical level.
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electrochemical impedance spectroscopy of a li s battery part 2 influence of separator chemistry on the lithium electrode electrolyte Interface
Electrochimica Acta, 2017Co-Authors: Joanna Conder, Sigita Trabesinger, Lorenz Gubler, Renaud Bouchet, Claire Villevieille, Petr NovákAbstract:Abstract Asymmetric separators with polysulfide barrier properties, consisting of porous polypropylene (PP) grafted with styrene sulfonate (SS), PP-g-PLiSS, were characterized in symmetric Li/Li cells using electrochemical impedance spectroscopy to investigate the influence of separator chemistry on the Li electrode/electrolyte Interface. The symmetric Li/Li cell approach was found to be applicable for probing the transport properties of the separator and, therefore, determining the role of the functionality added to the separator. Electrolyte resistance and the formation of a surface film on metallic Li were both monitored as functions of time and the concentration of cation-exchange groups introduced at and near the surface of one side of the separator (expressed as the graft level). No continuous build-up of Li electrode/electrolyte Interface resistance was observed, indicating that the addition of a cation-exchange layer did not hinder entirely Li-ion transport through the separator. In addition, the microstructures of the separators were reconstructed based on focused ion beam/scanning electron microscopy tomography to determine the effective ionic conductivity and effective tortuosity of the PP-g-PLiSS separators. These values showed that ion mobility within the separator changed with increasing graft level, indicating that the concentration of SS groups and bulk porosity of the separator have to be adjusted to maintain the effective conductivity at a practical level.
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evolution of the electrode electrolyte Interface in a lithium polymer battery
Solid State Ionics, 2006Co-Authors: Anna Teyssot, Massimiliano Rosso, Renaud Bouchet, Stephane LascaudAbstract:Abstract Using impedance spectroscopy and in situ optical absorption experiments, we have studied the evolution of a lithium electrode/polymer electrolyte Interface during aging and cycling. During a period of 3–5 days after assembling a cell, aging has a detrimental effect on the Interface: this effect is observed both on the Interface impedance and on the optical properties of the electrolyte. After this initial period, optical absorption measured during cycling a cell reveals a concentration evolution in the electrolyte in agreement with theoretical predictions.
Walter G. Besio - One of the best experts on this subject based on the ideXlab platform.
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Electrode–Electrolyte Interface Modeling and Impedance Characterizing of Tripolar Concentric Ring Electrode
IEEE Transactions on Biomedical Engineering, 2019Co-Authors: Seyed Hadi Nasrollaholhosseini, Jason Mercier, Godi Fischer, Walter G. BesioAbstract:Electrodes are used to convert ionic currents to electrical currents in biological systems. Modeling the Electrode-Electrolyte Interface and characterizing the impedance of the Interface could help to optimize the performance of the electrode Interface to achieve higher signal to noise ratios. Previous work has yielded accurate models for single-element biomedical electrodes. This paper introduces a model for a tripolar concentric ring electrode (TCRE) derived from impedance measurements using electrochemical impedance spectroscopy with a Ten20 electrode impedance matching paste. It is shown that the model serves well to predict the performance of the Electrode-Electrolyte Interface for TCREs as well as standard cup electrodes. In this paper, we also discuss the comparison between the TCRE and the standard cup electrode regarding their impedance characterization and demonstrate the benefit of using TCREs in biomedical applications. We have also conducted auditory evoked potential experiments using both TCRE and standard cup electrodes. The results show that electroencephalography (EEG) recorded from tripolar concentric ring electrodes is beneficial, acquiring the auditory brainstem response with less stimuli with respect to recoding EEG using standard cup electrodes.
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Impedance spectroscopy of tripolar concentric ring electrodes with Ten20 and TD246 pastes
2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2017Co-Authors: Seyed Hadi Nasrollaholhosseini, Daniel Salazar Herrera, Walter G. BesioAbstract:Electrodes are used to transform ionic currents to electrical currents in biological systems. Modeling the Electrode-Electrolyte Interface could help to optimize the performance of the electrode Interface to achieve higher signal to noise ratios. There are previous reports of accurate models for single-element biomedical electrodes. In this paper, we measured the impedance on both tripolar concentric ring electrodes and standard cup electrodes by electrochemical impedance spectroscopy (EIS) using both Ten20 and TD246 electrode paste. Furthermore, we applied the model to prove that the model can predict the performance of the Electrode-Electrolyte Interface for tripolar concentric ring electrodes (TCRE) that are used to record brain signals.
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Modeling tripolar concentric ring electrode (TCRE) sensor and acquisition of auditory brainstem response
2017 IEEE SENSORS, 2017Co-Authors: Preston Steele, Seyed Hadi Nasrollaholhosseini, Jason Mercier, R. Bartels, Walter G. BesioAbstract:Brain activity generates electrical potentials that are spatio-temporal in nature. Electroencephalography (EEG) is the least costly and most widely used noninvasive technique for diagnosing many brain problems. It has high temporal resolution, but lacks high spatial resolution. The surface Laplacian enhances the spatial resolution and selectivity of the surface electrical activity recording. Tripolar concentric ring electrode (TCRE) sensors have been shown to estimate the surface Laplacian directly and have significantly better spatial resolution than conventional electrodes. The EEG electrodes on the scalp transform ionic currents to electrical currents in biological systems. Modeling the Electrode-Electrolyte Interface could help to optimize the performance of the electrode Interface to achieve higher signal to noise ratios. There are previous reports of accurate models for single-element biomedical electrode sensors. In this paper we develop a model for the Electrode-Electrolyte Interface for TCRE sensors as well as acquire auditory evoked potentials to demonstrate the utility of TCRE sensors over conventional disc electrode sensors.
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EMBC - Electrode-Electrolyte Interface model of tripolar concentric ring electrode and electrode paste
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and, 2016Co-Authors: Seyed Hadi Nasrollaholhosseini, Preston Steele, Walter G. BesioAbstract:Electrodes are used to transform ionic currents to electrical currents in biological systems. Modeling the Electrode-Electrolyte Interface could help to optimize the performance of the electrode Interface to achieve higher signal to noise ratios. There are previous reports of accurate models for single-element biomedical electrodes. In this paper we develop a model for the Electrode-Electrolyte Interface for tripolar concentric ring electrodes (TCRE) that are used to record brain signals.
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Electrode-Electrolyte Interface model of tripolar concentric ring electrode and electrode paste
2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2016Co-Authors: Seyed Hadi Nasrollaholhosseini, Preston Steele, Walter G. BesioAbstract:Electrodes are used to transform ionic currents to electrical currents in biological systems. Modeling the Electrode-Electrolyte Interface could help to optimize the performance of the electrode Interface to achieve higher signal to noise ratios. There are previous reports of accurate models for single-element biomedical electrodes. In this paper we develop a model for the Electrode-Electrolyte Interface for tripolar concentric ring electrodes (TCRE) that are used to record brain signals.
William A Goddard - One of the best experts on this subject based on the ideXlab platform.
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initial steps in forming the electrode electrolyte Interface h2o adsorption and complex formation on the ag 111 surface from combining quantum mechanics calculations and ambient pressure x ray photoelectron spectroscopy
Journal of the American Chemical Society, 2019Co-Authors: Jin Qian, Yifan Ye, Hao Yang, Junko Yano, Ethan J Crumlin, William A GoddardAbstract:The interaction of water with metal surfaces is at the heart of electrocatalysis. But there remain enormous uncertainties about the atomistic interactions at the electrode–electrolyte Interface (EEI). As the first step toward an understanding of the EEI, we report here the details of the initial steps of H2O adsorption and complex formation on a Ag(111) surface, based on coupling quantum mechanics (QM) and ambient-pressure X-ray photoelectron spectroscopy (APXPS) experiments. We find a close and direct comparison between simulation and experiment, validated under various isotherm and isobar conditions. We identify five observable oxygen-containing species whose concentrations depend sensitively on temperature and pressure: chemisorbed O* and OH*, H2O* stabilized by hydrogen bond interactions with OH* or O*, and multilayer H2O*. We identify the species experimentally by their O 1s core-level shift that we calculate with QM along with the structures and free energies as a function of temperature and pressur...
J. Jossinet - One of the best experts on this subject based on the ideXlab platform.
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The linear and non-linear electrical properties of the Electrode-Electrolyte Interface
Biosensors and Bioelectronics, 1999Co-Authors: Eric Mcadams, A. Lackermeier, James Mclaughlin, D Macken, J. JossinetAbstract:A review of various aspects of Electrode-Electrolyte Interface impedance is presented. The effect of electrode topography on the form and magnitude of the Interface impedance is discussed. The work of Schwan and his colleagues on the non-linearity of the Interface impedance is presented and interpreted. The electrical properties of silver-silver chloride electrodes (much used in a wide range of biomedical applications) are also briefly
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Non-linear transient response of Electrode-Electrolyte Interfaces
Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards, 1998Co-Authors: E.t. Mcadams, J. JossinetAbstract:The non-linearity of the Electrode-Electrolyte Interface impedance under transient conditions was investigated by Onaral and Schwan (1983). They discovered intriguing relationships between V(t), I/sub DC/ and time, t. The present authors believe that they can interpret these empirical relationships using a very simple equivalent circuit model.
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The detection of the onset of Electrode-Electrolyte Interface impedance nonlinearity: A theoretical study
IEEE Transactions on Biomedical Engineering, 1994Co-Authors: E.t. Mcadams, J. JossinetAbstract:The equivalent series resistance and reactance of the Electrode-Electrolyte Interface impedance have both been used to detect the onset of signal amplitude induced nonlinearity. Using a theoretical model, it is shown that the choice of the most sensitive indicator depends on the phase angle of the "polarization" impedance and on the applied frequency.
John M. Griffin - One of the best experts on this subject based on the ideXlab platform.
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A gateway to understanding confined ions
Nature Nanotechnology, 2020Co-Authors: John M. GriffinAbstract:A new electrolyte gating technique probes the dynamics of the electrical double layer at the electrode–electrolyte Interface. The experiments reveal an ion nanoconfinement effect that may help to explain supercapacitor charging mechanisms.