Methanol is a fuel used in DMFCs.

Micro-combined heat and power fuel cells refer to stationary units designed to provide electricity,hot water and sometimes space heating. These can either be for residential use or for small offices and commercial buildings.

Molten carbonate fuel cells have an electrolyte of molten carbonate salt and operate at temperatures in the region of 600C to 700C. Negatively charged carbonate ions carry the current through the membrane separating the electrodes, which have a standar electrical connection. MCFC systems are fuelled by hydrogen.

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.

Reformate is the output of fuel reformer. Such as gas stream often contains hydrogen, carbon monoxide and carbon dioxide. This reformate gas can be fed to a fuel cell, generally after some degree of cleanup.

A reversible,or regenerative,fuel cell can operate as a fuel cell,or in reverse like an electrolyser.

Separator plates are used to physically separate individual fuel cells in a stack.

Solid oxide fuel cells have a solid metal oxide as the electrolyte and can exist in multiple geometries including planar and tubular. They function at the highest temperature of the different types of fuel cells(about 900C to 1,000C) and can reform most fuels internally.