Proton Exchange Membrane Fuel Cell
Works with a polymer electrolyte in the form of a thin permeable sheet. This membrane is small and light and works at low temperatures around 80°C.
- Use platinum-containing electrodes
- 10′s of ppm of CO can poison a pure platinum catalyst, this means pure hydrogen is required as the fuel for PEM fuel cells.
- Hydrogen produced by steam reforming light hydrocarbons contains 1 to 3% CO.
- 25% load dropping to 30 to 55% at 100% load.
- At low loads (~5%) the efficiency can drop to below 30%.
- Relies on liquid water humidification of the membrane to transport protons.
- solid electrolyte reduces corrosion and electrolyte management problems
- low temperature
- quick start-up
- expensive catalysts - platinum
- sensitive to fuel impurities - carbon monoxide
- low temperature waste heat - makes heat rejection difficult in high ambient temperature conditions
- Fuel Cell and Hydrogen Energy Association The world′s premier advocacy organization dedicated to the commercialization of fuel cells and hydrogen energy technologies.
- NREL Fuel Cell Research Projects focus on hydrogen production, delivery, and storage; fuel cells; technology validation; safety, codes, and standards; analysis; and manufacturing.