2. Electroplating
• Electroplating is a process for producing
a metal coating on a solid substrate through
the reduction of cations of that metal by means of
a direct electric current.
• The part to be coated acts as
the cathode (negative electrode) of an electrolytic
cell; and the anode (positive electrode) is usually
either a block of that metal, or of some
inert conductive material.
3. Galvanic cell or Voltaic cell
• A galvanic cell or voltaic cell, named after the
scientists Luigi Galvani and Alessandro Volta.
• A galvanic cell is an electrochemical cell in which an
electric current is generated from spontaneous
Oxidation-Reduction reactions.
• A common apparatus generally consists of two different
metals, each immersed in separate beakers containing
their respective metal ions in solution that are
connected by a salt bridge or separated by a porous
membrane.
4. Galvanic cell or Voltaic cell
• The anode is an electrode where oxidation occurs.
• The cathode is an electrode where reduction occurs.
• A salt bridge is a chamber of electrolytes necessary to
complete the circuit in a voltaic cell.
• The oxidation and reduction reactions are separated into
compartments called half-cells.
• The external circuit is used to conduct the flow of electrons
between the electrodes of the voltaic cell and usually
includes a load.
• The load is the part of the circuit which utilizes the flow of
electrons to perform some function.
5. Electrolytic cell
• An electrolytic cell is an electrochemical cell that
utilizes an external source of electrical energy
(voltage applied between two electrodes) to drive
a chemical reaction that would not otherwise
occur.
• This is in contrast to a galvanic cell, which itself
is a source of electrical energy and the foundation
of a battery.
6. Electrolytic cell
• An electrolytic cell has three components:
an electrolyte and two electrodes (a cathode and
an anode).
• The electrolyte is usually a solution of water or
other solvents in which ions are dissolved. Molten
salts such as sodium chloride can also function
as electrolytes. When driven by an external
voltage applied to the electrodes.
7. Difference between Galvanic and Electrolytic
cells
• We can conclude that a galvanic cell produces an
electric current with a chemical reaction that happens
spontaneously in it, whereas an electrolytic cell does
the opposite.
• This means it brings about the chemical reaction using
an electric current from an external source.
