What are fuel cells and reactions takes place in it?, Chemistry

In recent years, the scientists have designed the cells which convert chemical energy of a fuel directly into electrical energy. These cells are called fuel cells. These are the voltaic cells in which, the fuels such as H2, CO, CH4, C2H8 etc. are used to produce electrical energy with no the intervention of thermal devices like boiler, turbines, etc.


The conventional method of conversion of chemical energy of a fuel into electrical energy produced of a fuel to liberate heat. The heat energy so formed is used to produce steam for spinning the turbines which are joined to electrical generators. This process is approximately 40% efficient.

Fuel cells are designed to be oxidized and reduced at the electrodes are stored outside the cell and are constantly supplied to the electrodes. In fact, fuel cell is a flow battery that continues to operate as long as the reactants from outside are fed into it. One of the most successful fuel cells uses the reaction of the hydrogen and oxygen and oxygen to form water and is known as H2 - O2 fuel cell. The H2 - O2 fuel cell is also called Bacon cell after the name of its inventor and it had been used to power the Apollo space Missions. The water vapours produced during water supply for the astronauts. 

The cell consists of porous carbon electrodes and impregnated with catalyst (Pt, Ag or COO). Hydrogen and oxygen are bubbled from the electrodes into electrolyte which is an aqueous solution of NaOH or KOH.

The electrode reactions are:

1313_Fuel cell.png 

The cell runs endlessly as long as the gases hydrogen and oxygen are supplied at the temperature 525 K and 50 atm. pressure.

 

 

 

Posted Date: 6/26/2012 1:08:48 AM | Location : United States







Related Discussions:- What are fuel cells and reactions takes place in it?, Assignment Help, Ask Question on What are fuel cells and reactions takes place in it?, Get Answer, Expert's Help, What are fuel cells and reactions takes place in it? Discussions

Write discussion on What are fuel cells and reactions takes place in it?
Your posts are moderated
Related Questions
Total number of unpaired electrons in an atom of atomic number 29 is: (1) 1        (2) 3        (3) 4        (4) 2 Ans: 1

IUPAC name is given to compounds. Carbon is an element so it will bw called as carbon only. eg. hydrocarbons - CH4=methane                            C2H6=Ethane

1(a). In these reactions, I2 (in the iodine solution) has what oxidation number? 1(b). The iodine starch reaction that turns purple depends on iodine being in the I- state. Was

Calculate the standard potentials of the Ag 5 and Ag 10 nanoclusters. Define the change in standard potential of silver nanoclusters with particle sizes ranging from very sma

why boron shows +3 as well as-3 oxidation states?

The atomic number of an element is 17. The number of orbitals containing electron pairs in its valence shell is: (1) Eight                (2) Six          (3) Three

a) Describe why not all of the organic matter in wastewater is converted to carbon dioxide and water in biological treatment. b) What is the importance of the BOD in the charact

If the water molecules in 1g of water were uniformly distributed on earth surface , how many such water molecules would there be in 1 cm^2 of earth? Solution) No. of molecules in

The frequency of a wave of light is 12x 10 14 s -1 .   The wave number associated with this light is: (1) 5x10 -7 m                        (2)  4x 10 -8 cm -1

The order of a reaction is occasionally changed by conditions. Consider a chemical reaction between two substances where one reactant is there in large excess. During the hydrolysi