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Fuel Cell

• use of polymer(solid) electrolyte
• high power density
• compact size
• pollution-free technology
• good applicability
• relatively high efficiency
• no-noise pollution
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 membrane electrode assembly (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 by:

At the Anode:

The newly formed protons permeate through the polymer electrolyte membrane to the cathode side. The electrons travel along an external load circuit to the cathode side of the MEA, thus creating the current output of the fuel cell. Meanwhile, a stream of oxygen is delivered to the cathode side of the MEA. At the cathode side oxygen molecules react with the protons permeating through the polymer electrolyte membrane and the electrons arriving through the external circuit to form water molecules. This reduction half-cell reaction or oxygen reduction reaction (ORR) is represented by:

At the cathode:

Overall reaction:

The reversible 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.

The main advantages of High Temperature Proton Exchange Membrane Fuel Cells(HTPEMFC):
• high performance
• wide range of operational temperatures
• high CO and sulphur tolerance
• high durability
• no requirements for humidification
• fuel tolerant
• flexible design fulfilling costumer requirements
• cost effective and low Pt content

C-402, Main building, Sangmyung University 31 Sangmyungdae-gil, Dongnam-gu, Cheonan Chungnam Province 330-720, Republic of Korea