**1.1.3 Phosphoric acid fuel cell (PAFC)**

The phosphoric acid fuel cell (PAFC) operates at around 175-200 °C. This range of operating temperature is almost twice as high as the PEM's. It uses phosphoric acid as electrolyte. Unlike PEMFC and AFC, the PAFC is very tolerant to impurities in reforming hydrocarbons. The chemical reaction involved in this type of fuel cell is the same as PEMFC, where hydrogen is used as fuel input, however PAFC is more tolerant to CO2 (Farooque & Maru, 2001). Cogeneration is also possible due to its relatively high operating temperature. The disadvantage of the PAFC is the same as the PEM's, its cost also increases due to the use of platinum as a catalyst (O'Sullivan, 1999).
