Electrodes

Device that moves electrons into or out of a solution by conduction.

The positive electrode is called the anode and the negative electrode is called the cathode.

Electrodes are found in: Batteries, Electrolysis, Vacuum Tubes.

Active Material

The material in the electrodes that takes part in the electrochemical reactions which store-deliver the electrical energy.

Activation Overpotential

The overpotential which results from the restrictions imposed by the kinetics of charge transfer at an electrode.

Geometric Electrode Area

The surface area of an electrode calculated from its geometrical dimensions.

Irreversible Electrode

An electrode with an irreversible electrode reaction.

Standard Electrode Potential

The reversible potential of an electrode with all the active materials in their standard states.

True Electrode Area

The surface area of an electrode taking into consideration the surface roughness. For a perfectly smooth electrode, it is equal to the geometric electrode area, but it is larger than that for most electrodes. The ratio of the two defines the roughness factor.

See also: Anode, Calomel Electrode, Cathode, Charge Density, Charge Transfer Resistance, Combination Electrode, Counter Electrode, Electrolysis, Negative Electrode, Reference Electrode, Standard Electrode Potential, Standard Rate Constant of Electrode Reaction, Working Electrode.

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Subjects: Chemistry Physics