Fuel cells, electrolytic cells and secondary cells!!!

Galvanic cell transformation:

Chemical —→ Electrical

FUEL cell electrodes are…

POROUS and CATALYTIC (PT) TO INCREASE SURFACE CONTACT WITH GASES AND HENCE INCREASING ELECTRICITY PRODUCTION

Continuous supply of reactants =

Fuel cell

IN GALVANIC THERES NO SALTBRIDGE AND 

ELECTROLYTE ACTS AS  A SALT BRIDGE

FARADAYS LAWS

Q = I x T, Q=n(e-) x F

FUEL CELLS ARE A TYPE OF GALVANIC CELL that doesn’t have a…

SALTBRIDGE. THE ELECTROLYTE SOLUTION ACTS LIKE A SALT BRIDGE

PRIMARY CELL IS AN

A TYPE OF GALVANIC CELL

PRIMARY CELLS PRODUCTS OF DISCHARGE DO NOT REMAIN IN CONTACT WITH THE ELECTRODE…

HENCE CANNOT BE RECHARGED AND OUR DISPOSED.

OPERATION OF SECONDARY CELLS

The battery will undergo discharge (chem —> Electrical) and when the battery dies, it will undergo recharge (electrical —> Chem) PRIMARY CELL PRODUCTS OF DISCHARGE DO REMAIN IN CONTACT WITH THE ELECTRODE

ELECTROLYTIC CELLS

• Electrical —→ Chemical

• Non-spontaneous reaction (positive gradient)

• Negative cathode positive anode

Electroplating

ELECTROPLATING (DEPOSIT OF A DESIRED METAL ONTO AN OBJECT CONNECTED TO THE CATHODE). OBJECT TO BE PLATED MUST BE CONNECTED TO THE CATHODE (NEGATIVE). THE ION FORM OF THE METAL MUST BE PRESENT IN THE ELECTROLYTE. THE METAL TO BE DEPOSITED MUST BE THE ANODE.

Rechargeable cell =

Secondary cell