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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: The cell runs endlessly as long as the gases hydrogen and oxygen are supplied at the temperature 525 K and 50 atm. pressure.
Which of the following ions is not having the configuration of neon: (1) F - (2) Mg +2 (3) Na + (4
If an electron has spin quantum number of +1/2 and a magnetic quantum number of -1 , it cannot be presented in an: (1) d -orbital (2) f -orbital (3) p -orbital (4)s-
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how intigration of 3rd order reaction done by partial fraction method
The ratio of area covered by second orbital to the first orbital is: (1) 1 : 2 (2) 1 : 16 (3) 8 : 1 (4) 16 : 1 Ans: 16 : 1
What property command to water soluble vitamins permits water solubility Ans) Because of 1]OH bond between them 2] polar componets 3] Availibility of in nature
Gold has a molar mass of 197g/mol. How many atoms are in the sample?Please give me procedure also. Ans) molecular wieght of gold is 197 g 1mole/g of molecule is occupies t
Question: (a) Explain the potential health risk which composting will pose to workers or to those located near a facility. (b) A number of concerns have been shown in regar
The covalent bond produced by the unequal sharing of electrons among the two atoms is known as polar covalent bond.
How is threshold frequency related of the incident radiation
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