Dear students,
Check out this post to explore about fuel cells.. the future...
A fuel cell is an electrochemical cell that converts chemical energy (energy stored in bonds) into electrical energy by electrochemical reaction. These cells require a continuous input of fuel and oxygen as an oxidizing agent in order to sustain the reactions that generate the electricity.
Hydrogen Fuel Cell:
One of the most successful fuel cells uses the reaction of hydrogen as a fuel with oxygen to generate electricity. It consists of an electrolytic solution such as 25% KOH and two inert porous electrodes. Hydrogen and oxygen gases are bubbled through the anode and cathode compartment respectively where the following reaction takes place.
At Anode: hydrogen molecules are oxidized with the liberation of electrons, which then combine with hydroxide ions to form water.
At Catode: The electrons are absorbed by oxygen to form hydroxide ions.
The standard emf of the cell is given by
1.23 V. Therefore 80% of chemical energy is converted into electrical energy.
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