Gamry Instruments will be an exhibitor at The European Corrosion Congress in Pisa, Italy Gamry Instruments is proud to be an exhibitor at EUROCORR 2014, the annual event of the European Federation of Corrosion Philadelphia, PA Gamry Instruments, designer and manufacturer of electrochemical instruments, will be an exhibitor at EUROCORR 2014– September 8-12, 2014 in Read more about Gamry Instruments to Exhibit at Eurocorr 2014[…]
Gamry Instruments will be an exhibitor at The International Society of Electrochemistry Meeting in Lausanne, Switzerland Gamry Instruments is proud to be an exhibitor at the 65th Annual Meeting of the International Society of Electrochemistry entitled Ubiquitous Electrochemistry Philadelphia, PA, Aug. 20, 2014 Gamry Instruments, designer and manufacturer of electrochemical instruments, will be an exhibitor Read more about Gamry Instruments to Attend 65th Annual ISE Meeting[…]
The 65th Annual ISE Meeting August 31 – September 5, 2014 Lausanne, Switzerland The meeting will be held in the Swiss Tech Convention Center (STCC) on the campus of the Ecole Polytechnique Fédérale de Lausanne (EPFL), which includes other architectural landmarks such as the Rolex Learning Center. Electrochemistry involves chemical phenomena associated with charge separation Read more about International Society of Electrochemistry Annual Meeting[…]
Detects Diseases, Measures Biomarkers, Costs $25 In advanced industrialized nations most diagnostic tests that check body fluids for markers of disease make use of specialized sensors and devices that, although they deliver accurate results, can be very expensive. Now researchers at Harvard University have unveiled a new portable device that can perform a slew of Read more about Handheld Electrochemical Sensor[…]
This Application Note is intended to provide the reader with a general framework for characterization of an electroactive polymer film. Electropolymerization is a convenient way to control film growth either through repeated cycling, potential steps, or current steps. Examination of the film redox behavior in monomer-free, fresh electrolyte provides insight on doping and dedoping of these polymer films.
Polybithiophene films were assembled by cycling an Au-coated 10 MHz quartz crystal between 0 and 1.5 V in the presence of 1 mM bithiophene solution containing 100 mM tetrabutylammonium perchlorate (TBAP) in acetonitrile (MeCN). Potentials are reported against a Ag/Ag+ pseudo-reference electrode. The Teflon® cell was outfitted with a Teflon o-ring to prevent swelling from the acetonitrile and placed inside a VistaShield™. The cell was connected to an eQCM 10M™ which was coupled to a Reference 600™. Both instruments were connected to a computer running Resonator™ version 5.67. Bithiophene, electropolymerizes via a two-electron oxidation at potentials greater than ~1.25 V versus a Ag/Ag+ pseudo reference electrode.
Figure 1 shows two cycles of film growth. Cycle 1 (blue curve) shows only background (non-Faradaic) current until the potential is greater than 1.25 V. Cycle 2 shows additional Faradaic current beginning at approximately 0.75 V due to oxidation of the polymer film. Polymerization still happens at potentials greater than 1.25 V. The small spike at 1.1 V is related to an irreversible film rearrangement since subsequent cycles (seen when thicker films were prepared) show no current spike.
Figure 1: Electropolymerization of 1 mM bithiophene in 0.1 M TBAP/MeCN. Scan rate was 50 mV/s.
The Battery Show’ is being held September 16-18 2014 in Novi, Detroit Michigan. This will be the premier showcase of all the latest advanced battery technology and is an ideal venue for tech leaders, scientists, engineers, project leaders, buyers and executives concerned with advanced energy storage. The latest advanced battery solutions for electric & hybrid Read more about The Battery Show Conference & Expo for Advanced Batteries[…]
Porous Glass is often used at the end of a reference electrode or a bridge tube to allow electrical, ionic conductivity between the bulk of the solution and the internal filling solution, while preventing large scale convective mixing of the solutions. Porous Glass, or “thirsty glass” is a porous glass with a fairly low leak rate.
The Porous Glass frits, however, are not immortal!
To preserve their useful lifetime, they should be kept wet. If they are allowed to dry out, solid crystals can clog the narrow pores and increase the electrical resistance. In extreme cases, the Porous Glass can crack upon drying out.
When not in use, the reference electrode or bridge tube can be stored with the Porous Glass frit immersed in distilled water. Diffusion through the Porous Glass is fairly slow, and the internal filling solution will not be diluted, even upon a few weeks of storage.
An alternative is to replace the small plastic cap that was in place when the reference electrode was shipped.
Porous electrodes offer a high surface area to volume or weight ratio which is highly beneficial to a number of energy generation or storage devices. (e.g. Dye-Sensitized Solar Cells, Super-Capacitors, Fuel Cells, etc). Transmission lines are heavily used in modeling in Electrochemical Impedance Spectroscopy (EIS) experiments where porous systems are employed.
Though transmission lines are commonly used, an introductory paper was hard to find. This paper is intended to serve that purpose. It assumes basic knowledge of EIS and modeling using equivalent circuits as covered in our EIS application note.
We will distinguish between the base electrode and the porous electrode and the various interfaces as shown in Figure 1.
Figure 1. Porous Electrodes and the Nomenclature That Will Be Used in This Paper.
Some of the most common technical questions we hear have to do with iR compensation —
In this post we’ll attempt to answer these questions and to give you a basic understanding of iR compensation.
What’s important in the selection of a potentiostat? That depends greatly on its intended use. This page addresses an often misunderstood term.
Compliance voltage is the voltage available at the counter electrode that can be used to force current to flow and still maintain control of the working electrode voltage. The compliance should be specified in conjunction with a current value: “20V @ 250mA” or “20V @ full rated current”. An amplifier’s output voltage decreases at higher currents due to the output impedance of the amplifier.
Dates: November 10-14, 2014
Where: Houston, Tx
Course OverviewImpedance spectroscopy is an extremely powerful non-destructive investigative technique that can obtain essential information about interfacial and bulk material parameters through the use of low energy, time varying electrical excitation. When applied to an electrochemical system, electrochemical impedance spectroscopy (EIS) can provide information on reaction parameters, corrosion rates, oxide characteristics and integrity, surface porosity, coating integrity, mass transport, and many other electrode/interface characteristics. EIS is possibly one of the most powerful methods available in electrochemistry today and is utilized in research and development in essentially every technical sector, e.g., transportation and infrastructure, batteries and fuel cells, medicine, among many others. However, effective utilization of this method has been hindered by the lack of a comprehensive and cohesive explanation of the theory, measurement, and analysis techniques. This course on EIS has been developed to fill this void.
This short course, now in its 26th year, was first taught in 1988 in Charlottesville, Virginia. It has recently had the tremendous fortune of moving to the vibrant and technologically rich city of Houston, Texas. Please read more about our course on this website, or contact us either by e-mail or telephone.
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