What is the function of potentiostat?
A potentiostat is an analytical instrument designed to control the working electrode’s potential in a multiple electrode electrochemical cell. The potentiostat contains many internal circuits that allow it to function in this capacity. The circuits generate and measure potentials and currents.
How do I choose a potentiostat?
For batteries, the selection of potentiostat will depend on the kind of battery you are studying (i.e., chemistry, form factor, half or full cells) and whether you are stacking them in various series or parallel configurations. Li-ion batteries typically have a cell voltage around +3.0 V.
What is meant by potentiostat?
A potentiostat is a control and measuring device that, for example, in an electrochemical cell, keeps the potential of one (working) electrode at a constant level with respect to the reference electrode.
Who invented the potentiostat?
In the early 1940s, Archie Hickling at the University of Leicester, England, who was working in the field of electrochemistry, invented the potentiostat and coined the apt name for the device.
What is a Voltammogram?
A voltammogram is a plot of the current as a function of the applied potential. The shape of a voltammogram depends on the type of indicator electrode and the potential ramp that are used.
Why do we use 3 electrodes?
Large currents passing through an electrode can change its potential. Therefore, if you want careful control and measurement of both potential and current through a cell, you want to use three electrodes.
Why platinum electrode is used?
Other metals are very reactive towards acid. Hence non-reactive or inert electrodes like platinum are used. Platinum is a noble metal and is used as an electrode in this electrolysis.
How do you read a Voltammogram?
Understanding the Simple Voltammogram The x-axis represents a parameter that is imposed on the system, here the applied potential (E), while the y-axis is the response, here the resulting current (i) passed. The current axis is sometimes not labeled (instead a scale bar is inset to the graph).
What does e1/2 tell you?
In a CV containing a feature that has a forward and reverse wave, regardless of whether it is reversible or irreversible, E1/2 defines the potential exactly in the middle of the two peaks.
What is H cell?
H-cell — is a divided electrochemical cell, named af- ter its similarity with letter H. It principally consists of two compartments, connected through a diaphragm. A modification or special H-type design is the Lin- gane cell [i], developed for use with mercury electrodes within a three-electrode setup.
Is platinum a cathode or anode?
In inorganic chemical industry platinum is widely used as the anode in a number of electrochemical processes, but perhaps least known is its usefulness as an anode in the electrolytic oxidation of organic compounds.
What is the symbol of platinum?
PtPlatinum / Symbol
Platinum is a chemical element in the periodic table that has the atomic symbol Pt and an atomic number of 78. Platinum is used in jewelry, laboratory equipment, electrical contacts, dentistry, and automobile emissions control devices. Platinum: Symbol Pt and an atomic number of 78.
What is pH meter principle?
The basic principle of the pH meter is to measure the concentration of hydrogen ions. Acids dissolve in water forming positively charged hydrogen ions (H+). The greater this concentration of hydrogen ions, the stronger the acid is.
What does Potentio mean?
A device for controlling or maintaining constant the potential difference between the electrodes in an electrochemical cell.
What is a CV scan?
Cyclic Voltammetry (CV) is an electrochemical technique which measures the current that develops in an electrochemical cell under conditions where voltage is in excess of that predicted by the Nernst equation. CV is performed by cycling the potential of a working electrode, and measuring the resulting current.