Pafc Fuel Cell Diagram

Purecell fuel cell system stationary fuel cell history 2009 400 kw model 400 1968 4 kw pafc 290 mm from doe for pafc main focus areas.

Pafc fuel cell diagram.

This type of fuel cell is typically used for stationary power generation but some pafcs have been used to power large vehicles such as city buses. The pafc is considered the first generation of modern fuel cells. Durability chp reference. Principle of operation of phosphoric acid fuel cells pafcs 2.

Hence the net fuel cell reaction produces water as follows. Alkaline fuel cells afcs generally use a solution of potassium hydroxide in water as their electrolyte and the operating temperature is 150 c 200 c. Most fuel cell systems that were sold before 2001 for the stationary power generation application used pafc technology. A phosphoric acid fuel cell pafc is composed of two porous gas diffusion electrodes namely cathode and anode juxtaposed against a porous electrolyte matrix.

Fetc perspective on the doe stationary power fuel cell program rita a. They are quite resistant to poisoning by carbon monoxide but tend to have lower efficiency than other fuel cell types in producing electricity. Afc uses platinum electrode catalysts. This makes it unsuitable for use in cars.

Based on a phosphoric acid fuel cell pafc system. Hydrogen is produced by diverting some of the reformed syngas to a hydrogen separator allowing the production of additional hydrogen via oversizing the reformer relative to the fuel cell. 5 purecell fuel cell system alternate electrolyte property desired pafc operating temperature c 150 250 150 250 ionic conductivity mho cm 0 65 0 65 vapor pressure atm 0 4 5 x 10 7 175 c o 2 solubility mol cm3 high 1 x 10 7 175 c transference number 0 0 11 anion poisoning none phosphate poisons catalyst electrochemical stability no decomposition products. Phosphoric acid fuel cell pafc the phosphoric acid fuel cell has potential for use in small stationary power generation systems.

It operates at a higher temperature than polymer exchange membrane fuel cells so it has a longer warm up time. Phosphoric acid fuel cells pafcs consist of an anode and a cathode made of a finely dispersed platinum catalyst on carbon and a silicon carbide structure that holds the phosphoric acid electrolyte. One of the major differences between the systems is that the pafc system has a separate reformer. H2 1 2 o2 h2o 4 figure 1.