Pafc Fuel Cell Diagram

Durability chp reference.

Pafc fuel cell diagram.

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. H2 1 2 o2 h2o 4 figure 1. 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. They are quite resistant to poisoning by carbon monoxide but tend to have lower efficiency than other fuel cell types in producing electricity.

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. It is one of the most mature cell types and the first to be used commercially. 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. Cell structure the pafc itself consists of a pair of porous electrodes the fuel electrode and air electrode formed from mainly carbon material between which is placed an electrolyte.

Fetc perspective on the doe stationary power fuel cell program rita a. It operates at a higher temperature than polymer exchange membrane fuel cells so it has a longer warm up time. 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. Hence the net fuel cell reaction produces water as follows.

Principle of operation of phosphoric acid fuel cells pafcs 2. Based on a phosphoric acid fuel cell pafc system. 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. This makes it unsuitable for use in cars.

Most fuel cell systems that were sold before 2001 for the stationary power generation application used pafc technology. The pafc is considered the first generation of modern fuel cells. Phosphoric acid fuel cell pafc the phosphoric acid fuel cell has potential for use in small stationary power generation systems. One of the major differences between the systems is that the pafc system has a separate reformer.