4Problem Solving -> Fuel Cell
What is a fuel cell?
A fuel cell is a device that converts the chemical energy fram a fuel into electricity through a chemical reaction of positicely charged hydrogen ions with oxygen or another oxidizing agent.Furl cells are different from batter ies in that they require a continuous source of fuel and oxygen or air to sustain the chemical reaction,whereas in a battery the chemicals present in the battery react with each other to generate an electromotive force (emf).Fuel cells can produce electricity continuously for as long as these inputs are supplied
Proton exchange membrane fuel cell
Proton exchange membrane fuel cells,also known as polymer electrolyte membrane(PEM)fuel cells (PEMFC),are a type of fuel cell being developed for transport applications as well as for stationary fuel cell applications and portable fuel cell applications.Their distinguishing features include lower temperature/pressure ranges(50 to 100 ˚C)and a special polymer electrolyte membrane. PEMFCs operate on a similar principle to their younger sister technology PEM electrolysis.They are a leading candidate to replace the aging alkaline fuel cell technology, which was used in the Space Shuttle. A proton exchange membrane fuel cell transforms the chemical energy liberated during the electrochemical reaction of hydrogen and oxygen to electrical energy, as opposed to the direct combustion of hydrogen and oxygen gases to produce thermal energy. A stream of hydrogen is delivered to the anode side of the MEA.At the anode side it is catalytically split into protons and electrons. This oxidation half-cell reaction or hydrogen oxidation reaction(HOR)is represented bu:
The revesible reaction is expressed in the equation and shows the reincorporation of the hydrogen protons and electrons together with the oxygen molecule and the formation of one water molecule.