Electrodes

metal rod or metallic object to protect from lightning

300px|thumb|upright=1.3|Electrodes used in shielded metal arc welding

thumb|Diagram of a copper cathode in a [[galvanic cell (e.g. a battery). Positively charged cations move towards the cathode allowing a positive current i to flow out of the cathode.]]

thumb|Diagram of a zinc anode in a [[galvanic cell. Note how electrons move out of the cell, and the conventional current moves into it in the opposite direction.]]

reference redox electrode used under standard conditions

reference electrode

electrode with a stable, well-known electrode potential

type of electrode and part of cold cathode fluorescent lamp

sensor

sensor that converts the activity of a specific ion dissolved in a solution into an electrical potential

An ion-sensitive field-effect transistor (ISFET) is a field-effect transistor used for measuring ion concentrations in solution; when the ion concentration (such as H+, see pH scale) changes, the current through the transistor will change accordingly. Here, the solution is used as the gate electrode. A voltage between substrate and oxide surfaces arises due to an ion sheath. It is a special type of MOSFET (metal–oxide–semiconductor field-effect transistor), and shares the same basic structure, but with the metal gate replaced by an ion-sensitive membrane, electrolyte solution and reference ele

electrode on which an electrochemical reaction occurs

type of reference electrode

vacuum tube electrode directly controlling the anode current

finely powdered platinum used as a catalyst

grid (electrode) in a vacuum tube used to suppress the dynatron effect, that occurs due to secondary emission at the anode

type of electrode.

field-effect transistor used as a sensor for measuring chemical concentrations in solution.

electrode which supplies/accepts current from the working electrode

electrode in the electron gun assembly of some thermionic devices

type of electrode used in electrochemistry

Measuring instrument

electrode measuring the oxygen partial pressure in a solution

barrier between electrically conducting materials

Redox electrode

conjunction of a solid, liquid and gaseous interface, and an electrical conducting catalyst

aircraft component used to remove static electricity

reference electrode whose potential depends on pH