Potentiostat / galvanostat / EIS
Galvanostats or potentiostats are constructed to measure electrochemical properties in applications such as corrosion, coatings, batteries, general electrochemistry, and many others. Electrochemical Impedance Spectroscopy (EIS) is an option on every instrument. The method of analysis is used to study corrosion, batteries, photovoltaic systems as well as in certain applications in life sciences. Other options include a broad assortment of voltage and current boosters.
We offer a wide range of Potentiostat from BioLogic Science Instruments. Our range of products includes galvanostats with single potentiostats additionally, they can be configured as bipotentiostats and multichannel potentiostats / galvanostats that offer the possibility of up to 16 channels to monitor the electrochemical effects of up to 16 simultaneously.
What is the process by which a potentiostat or galvanostat work?
A basic potentiostat is three electrodes (2 or four electrode connections are possible). It controls and measures the current difference between a working electrode and a reference electrode which has a constant power. It determines the flow of the current between the working electrode and counter electrode (that completes the cell circuit). As a galvanostat, the instrument regulates the current of the cell not the voltage of the cell.
The electrode of the working circuit could be a metal on where a reaction occurs or if corrosion is measured or tests – a sample of corroded material. When testing batteries it is necessary to connect the potentiostat directly to the electrodes of the battery.
Electrochemical Impedance Spectrum (EIS) tests permit the user to determine the resistance of charge transfer, double layer capacitance and Ohmic resistance.
Why use a potentiostat / galvanostat / EIS?
A potentiostat is crucial for studying reactions in electrochemistry, e.g. chemical redox reactions. Another purpose is to test the performance of batteries. Potentiostats can also be used to detect electrochemically active compounds (e.g. chemicals, toxins) and microbes.
Electrochemical Impedance Spectroscopy (EIS) is a tool with many uses. It is utilized to study corrosion e.g. in reinforced concrete but also in electrode kinetics, double-layer studies, batteries, photovoltaics and solid state electrochemistry systems.
Our potentiostat / galvanostat / EIS systems
Crucial to the function of a galvanostat or potentiostat and applications like electrochemical spectroscopy is the software. All our BioLogic instruments are controlled with the multi-faceted EC-Lab(r) software, to offer a variety of measurement modes, using various options for modular methods, with loop and wait options to create complex experimental chain. The software can also be used to control multiple potentiostats with the same interface.
A variety of quality indicators will enable users to verify their EIS experiments, with regard to non-stationarity, linearity or noise.
Furthermore, as opposed to other systems, there is the option to modify on the fly’ i.e. change parameter settings during the course of an experiment when results do not match what you expected.
Examples of applications of potentiostats /galvanostats/EIS
Metallic surfaces are prone to corrosion while in contact with a corrosive liquid (mostly in the presence of acidic solutions). Through electrochemical techniques, you can analyze the behavior of the metal after submerging in an acidic solution. Potentiostats / galvanostats are used to characterize the properties of these metallics. Techniques like e.g. electrochemical impedance spectrum (EIS), Linear Polarization Resistance and Tafel Plot experiments are used to study the behavior in the different metals.
Photosynthetic cells are ubiquitous these days. Solar energy is essential in the national, regional, and local energy production. In order to improve the efficiency of such an energy supply there is a great deal of research that is done. Photovoltaic solar cells ‘ characterization can be done using polarization as well as Electrochemical Impedance Spectroscopy techniques, which allow the user to measure the effectiveness of the cell and model. The contribution of the electrochemistry into fields of energy fields is at present a hot issue.
Understanding the kinetics and thermodynamics of any reaction that takes place on an electrode is the primary function of fundamental electrochemistry. Galvanostat EIS are crucial tools in this field. In this application, DC steady-state methods have been utilized, including: Chronoamperometry, cyclic Voltammetry the chronocoulometry method, chronopotentiometry voltage measurement, square wave voltammetry and various other techniques for calculating current potency.