What is a potentiostat used for?
A potentiostat (Figure 1) is an electronic instrument that controls the voltage difference between a Working Electrode and a Reference Electrode. Both electrodes are contained in an electrochemical cell.
What is voltammetry used for?
Voltammetry is a technique used to detect neurochemicals capable of undergoing oxidation reactions. These neurochemicals include neurotransmitters such as serotonin and the catecholamines (e.g., epinephrine, norepinephrine, and dopamine).
What is the function of counter electrode?
The counter or auxiliary electrode provides a means of applying input potential to the working electrode. The purpose of these electrodes is to complete the circuit and allow charge to flow.
What is voltammetry principle?
Voltammetry is the study of current as a function of applied potential. The working electrode, which makes contact with the analyte, must apply the desired potential in a controlled way and facilitate the transfer of charge to and from the analyte. A second electrode acts as the other half of the cell.
What is counter electrode in chemistry?
Counter electrodes, also referred to as auxiliary electrodes, are used in two or three electrode systems to complete the circuit so that electrochemical methods such as cyclic voltammetry can be performed.
What are the 3 electrodes?
The three electrode system consists of a working electrode, counter electrode, and reference electrode. The reference electrode’s role is to act as a reference in measuring and controlling the working electrode potential, without passing any current.
What does EIS measure?
EIS is a multifrequency AC electrochemical measurement technique. It measures the electrical resistance (impedance) of the metal/solution interface over a wide range of frequencies (from 1 mHz to 10 kHz).
Why do we use three electrodes?
For a better control and measurement of the current and potential going through the cell during the electricity driven chemical reaction, it is better to use a three electrode system to reduce and compensate the potential changes caused by large currents passing through the working and counter electrodes.