Palladium is one of the platinum group of metals and can be used for the purification of reformed hydrogen for fuel cells.

Phosphoric acid fuel cells use phosphoric acid as the electrolyte. Their operating temperature is typically higher than for polymer electrolyte fuel cells, at around 200C.

SOFCs can have multiple geometries. The planar geometry is the typical sandwich type geometry employed by most other fuel cells,where the electrolyte is sandwiched in between the electrodes.

A measure of cell performance that indicates the relationship between current density and voltage across a fuel cell.

Proton exchange membranes,aso referred to as polymer electrolyte membranes due to their composition,separate the feed gases in a PEMFC or DMFC and act as the electrolyte by allowing the passage of protons.

Proton exchange or polymer electrolyte membrane fuel cells use a solid acid membrane as the electrolyte. PEMFC operate at low temperatures(100C) and use platinum-containing electrodes.

Platinum is a commonly used catalyst material for PEMFC and DMFC technologies.