*1.6.4. PAFC*

"PAFC" uses liquid phosphoric acid as an electrolyte contained in a silicon carbide matrix bonded in Teflon and has finely dispersed platinum catalyst inside its porous carbon electro‐ des.

Phosphoric acid fuel cell is considered as the first-generation modern fuel cells. It is the first most commercially developed fuel cell used to power many commercial premises and large buses such as city buses. The major challenge of PAFC is the costly platinum catalyst which makes it uneconomical.

**Figure 7.** Showing components of phosphorus acid fuel cell (www.fuelcellmarkets.com)
