Pafc Fuel Cell Diagram

It operates at a higher temperature than polymer exchange membrane fuel cells so it has a longer warm up time.

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. Principle of operation of phosphoric acid fuel cells pafcs 2. Based on a phosphoric acid fuel cell pafc system.

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. 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.

Phosphoric acid fuel cell pafc the phosphoric acid fuel cell has potential for use in small stationary power generation systems. The gas diffusion electrodes are composed of a porous substrate carbon or cloth facing the gas feed and a reactive catalyst layer consisting of platinized fine carbon powder facing. This makes it unsuitable for use in cars. 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.

A phosphoric acid fuel cell pafc is composed of two porous gas diffusion electrodes namely cathode and anode juxtaposed against a porous electrolyte matrix. One of the major differences between the systems is that the pafc system has a separate reformer. Fetc perspective on the doe stationary power fuel cell program rita a. It is one of the most mature cell types and the first to be used commercially.

Afc uses platinum electrode catalysts. 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. Durability chp reference. The pafc is considered the first generation of modern fuel cells.