Some commercial energy producing cells


Primary cells, Dry cell, Secondary cells, Lead storage cell, Fuel cell, Hydrogen-Oxygen fuel cell

Energy producing cells


The energy producing cells are of two types - primary cells and secondary cells.

1) Primary cells

In a primary cell the reaction occurs only once and it becomes dead after a period of time and hence cannot be used again. Dry cell, mercury cell etc are examples of primary cells.
Dry cell The anode is zinc vessel and the cathode rod. It is surrounded by powdered Mno2. The space between the electrode is filled with a paste of NH4Cl and ZnCl2, the electrolyte. The potential is 1.5 V
Zn ------> Zn2+ + 2 electron (anode)
NH4+ + MnO2 + electron ------> MnO(OH) + NH3 (cathode)
It is of our common experience that dry cells do not have a long life. It is because the acidic ammonium chloride corrodes the zinc container even if the acidic ammonium chloride corrodes the zinc container even if the cell is not in use. In the leak proof cells, the zinc vessel is protected by an outer steel covering. In these cells recharging is not possible.

2) Secondary cells

These are cells which can be recharged and can be used again and again. Eg: Lead storage cell.
Lead storage cell This is a secondary cell in which lead acts as the anode and a grid of lead packed with lead dioxide acts as the cathode. A solution of sulphuric acid (38% by mass and density 1.3 g/ml) is used as the electrolyte.
Anode reaction : Pb + So4 2- -------> PbSO4 + 2 electron
Cathode reaction : PbO2 + 4H+ + SO4 2- + 2 electron ------> PbSO4 + 2H2O
Overall reaction : Pb + PbO2 + 2H2SO4 + 2 electron ------> PbSO4 + 2H2O
When the battery is recharged, the reverse of the reaction takes place .
A fully charged cell has a voltage of 2.2 V

Fuel cell

Fuel cells are galvanic cells in which chemical energy from combustion of fuels are converted to electrical energy. Eg: Hydrogen-oxygen fuel cell
Hydrogen-Oxygen fuel cell The cell consists of three compartments separated by graphite electrodes. H2 is passed through one compartment and O2 is passed through another compartment. Water containing small amount of NaOH is taken in the central compartment.
Anode reaction : [ H2 + 2OH- -----> 2H2O + 2electron] *2
Cathode reaction : O2 + 2H2O + 4electron -----> 4OH-
Net reaction : 2H2 + O2 -----> 2H2O
Fuel cells are very efficient and free from pollution. They produce continuous supply of energy. Fuel cells are used in space ships and in military equipments.

Reference: http://entrancechemistry.blogspot.com/search/label/Energy%20producing%20cells


Related Articles

How To Know Good Or Bad Omen From Vastu Shastra?

In today’s times, people’s inclination has enormously d towards vastu -shastra. The greatest proof of this fact is evident in every home. Vastu shastra converts homes into peaceful, well cultured and well decorated attire. This tends to lead every members of family towards a balanced, cheerful and prosperous path. This commentary is giving knowledge of this subject below.

Simple ways to be happy

Summary: You can learn some simple to be happy by not making comparison with anyone, being happy with whatever you have and enjoying things that you have, understanding philosophy, high thinking, idolizing someone and being simple. Many people are not easily happy because everybody is not lucky to become rich.

University of Petroleum and Energy Studies announces Admissions 2012

In this resource we have information related to the admission notification by the famous university for petroleum studies that is UPES, located in the outskirt of Dehradun. The university has now expanded the education courses, and also has new engineering courses ranging from technical ones, like Computer Engineering in collaboration with IBM to the Fire and safety domains as well.

More articles: Energy

Comments

No responses found. Be the first to comment...


  • Do not include your name, "with regards" etc in the comment. Write detailed comment, relevant to the topic.
  • No HTML formatting and links to other web sites are allowed.
  • This is a strictly moderated site. Absolutely no spam allowed.
  • Name:
    Email: