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Showing 1 to 20 of 112 for “"electrochemical impedance spectroscopy (EIS)"”.
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Electrochemical impedance modelling of the reactivities of dendrimeric poly(propylene imine) DNA nanobiosensors
In this thesis, I present the electrochemical studies of three dendrimeric polypropylene imine (PPI) nanomaterials and their applications as a platform in the development of a novel label free DNA nanobiosensor based on electrochemical impedance spectroscopy. Cyclic voltammetry (CV), differentia …
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The Effect of Buckling on the Interface Conductance in Flexible Lithium-Ion Batteries
… electrolyte were fabricated. The interfacial impedance in fresh and cycled flexible LIBs was investigated in flat and buckled configurations using electrochemical impedance spectroscopy (EIS). It is demonstrated that with increasing value of curvatures, contact resistances between components …
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Electrochemical impedance spectroscopy of proton exchange membrane fuel cell stacks
Electrochemical Impedance Spectroscopy (EIS) is applied to a small, four cell Proton Exchange Membrane (PEM) fuel cell stack to examine the stack response as the load current changes. The measured stack response is compared to a simulated response generated by a stack model that has been developed …
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Development and experimental investigation of direct urea fuel cells
… 48% and 41% at 65°C for stack, respectively. The electrochemical impedance spectroscopy (EIS) shows impedance reduction from 30 ohm.cm² at 25°C to 15 ohm.cm² at 65°C, indicating enhanced ionic conductivity and reduced resistance. These findings provide insights for advancing DUHPFC technology.
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Bioparticle capture and sensing utilizing nanograss based microfluidic devices
… emerged as a very attractive candidate for an electrochemical impedance spectroscopy (EIS) based biosensor. Such a sensing device is expected to perform direct sensing quickly with high sensitivity, and at low cost. In this work, the nanograss fabrication process is illustrated in detail. Then …
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Experimental Investigation of the Effect of Composition on the Performance and Characteristics of PEM Fuel Cell Catalyst Layers
… cell performance at common operating conditions, Electrochemical Impedance Spectroscopy (EIS), and Cyclic Voltammetry (CV) are then applied to investigate the cause of the observed variations in performance. The results show that both Nafion and carbon content significantly affect MEA performance. …
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Condition monitoring of lithium-ion batteries using broadband multisine excitation and electrochemical impedance spectroscopy
Electrochemical Impedance Spectroscopy (EIS) is a well-known technique that has been employed on various electrochemical cells to obtain their impedance spectra. Lithium-ion(Li-ion) cells are some of the cells to which it has been applied. The impedance spectra obtained from EIS can be used to …
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Oxygen reduction on platinum : an EIS study
… yttria-stabilized zirconia (YSZ) is examined via electrochemical impedance spectroscopy (EIS) for oxygen partial pressures between 10-4 and 1 atm and at temperatures between 475 and 700°C. Use of photolithographic techniques in electrode fabrication renders a precise geometry of the Pt electrodes. …
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Stability of double perovskite cathodes under high humidity for solid oxide fuel cells
… exposure using XRD to probe the bulk and Raman Spectroscopy to probe the surface. SEM was also used to characterize any morphological changes during the exposure. Second, electrochemical impedance spectroscopy (EIS) was used to monitor the long-term performance of symmetric cells under various …
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Jednoduchý elektrochemický DNA biosenzor pro detekci poškození DNA způsobeného UV zářením
… DNA damage was investigated using a simple electrochemical DNA biosensor based on an ultra-trace graphite electrode (UTGE) and low molecular weight doble-stranded DNA (dsDNA) from salmon sperm. Biosensor was prepared using adsorption of dsDNA on a surface of the UTGE and then used to detect …
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Structure of cathode-electrolyte interfaces and correlation with ionic conductivity in Solid Oxide Fuel Cell devices
… Secondary Electrons Microscopy (SEM), X-ray microspectroscopy, X-ray Absorption Near Edge Structure (XANES) and electrochemical Impedance spectroscopy (EIS). XRD was used to evaluate the materials chemical reactivity through Rietveld analysis. SEM and X-ray microspectrscopy were used to study the …
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Scalable Electrochemical Surface Enhanced Raman Spectroscopy (EC-SERS) for bio-chemical analysis
… performance for electrical recording and electrochemical sensing in bio-electronics applications. However, vertical nanopillar-array electrodes made of inorganic conducting materials by conventional nanofabrication approach still faces challenges in high manufacturing costs, poor …
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Analysis of Electrode Geometric Parameters on AC Impedance Response
<p>Electrochemical Impedance Spectroscopy (EIS) is a powerful and proven tool for analyzing AC impedance response. A conventional three electrode EIS method was used to perform the investigation in the present study. Saturated potassium chloride solution was used as the electrolyte, and three …
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Impedance Characterization and Modeling of Subcellular to Micro-Sized Au, Pt, TiN, and ITO Electrodes With PEDOT:PSS-Coating For Bioelectrical Interfaces
… interfaces with high biocompatibility, low-impedance, and long-term chemical and mechanical stability are of paramount importance in numerous biological and biomedical applications. For meticulous monitoring of biological parameters, there is a rapidly growing interest in sensing at …
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Study and achievement of organic-inorganic innovative materials through electrochemical techniques
… means diazonium salt (4-nitrobenzenediazonium) electrochemical reduction, prior to further modification with polyaniline or DNA. All these functionalization are realized using electrochemical techniques: organic molecules are grafted on the electrode surface using cyclic voltammetry, as well as …
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Two-Dimensional Titanium Carbide MXene for Lithium-ion Conductive Solid-state Electrolytes
… electron microscopy with energy-dispersive spectroscopy (SEM-EDS), Fourier-transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM) to evaluate its structural and morphological properties. To explore the potential of 2D Ti3C2Tx MXene in …
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Graphene Microelectrode Arrays to Combine Electrophysiology with Fluorescence Imaging of Amyloid Proteins
… The graphene MEA was characterised using Raman spectroscopy to check the graphene quality, and electrochemical impedance spectroscopy (EIS) to probe the electrode-electrolyte interface. The graphene MEAs enabled voltage trace recordings from cultured neurons to be combined with widefield, …
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Electrochemical impedance spectroscopy options for proton exchange membrane fuel cell diagnostics
Electrochemical impedance spectroscopy (EIS) has been exploited as a rich source of Proton Exchange Membrane Fuel Cell (PEMFC) diagnostic information for many years. Several investigators have characterized different failure modes for PEMFCs using EIS and it now remains to determine how this …
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Epoxy Siloxane Self-Cleaning Coating using F64PcZn/TiO2 Photocatalyst Composite
… The durability of the coating was evaluated by electrochemical impedance spectroscopy (EIS) due to the potential for unwanted photo-oxidation of the polymer by the photocatalytic material. After 11 weeks of atmospheric sunlight exposure, the coating containing the composite displayed a small …
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Electrochemical impedance spectroscopy and surface plasmon resonance for diagnostic antibody detection
… e.g. Surface Plasmon Resonance (SPR), and electrochemical detection, in particular Electrochemical Impedance Spectroscopy (EIS), have been shown viable for detection of lower affinity antibodies, based on the principle that these technologies allow the measurement of antibody binding to …
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