The area of a fuel cell electrode which is electrochemically active and able to produce electricity from the supplied fuel.

A type of fuel cell containing a potassium hydroxide electrolyte to react hydrogen and oxygen forming water,heat and electricity

The fuel electrode in a fuel cell at which oxidation occurs

An auxiliary power unit (for example a fuel cell) provides electricity and is supplemental to the main power source of a vehicle (such as an internal combustion engine).

A single cell is the smallest and most basic form of fuel cell. It is useful for testing and development purposes to predict how stacks will perform.

A fuel cell stack component which allows electricity to be conducted between adjacent fuel cell membrane electrode assemblies in a stack. They are often designed to channel the flow of gases and heat to and from the cell

The balance of plant in a fuel cell system is the auxiliary equipment requires to ensure the fuel cell operates as a reliable power source. This may include fuel reformers and pumps,for example

A catalyst increases the rate of reaction without itself being consumed. In a fuel Cell catalysts are used for the electrodes(to break down hydrogen into electrones and protons).

This refers to the mass of catalyst per unit area of a fuel cell electrode.

The oxygen/air electrode in a fuell cell where reduction occurs.

Combined cooling, heat and power utilises the waste heat from the fuel cell with absorption chillers to provide air conditioning and hot or cold water alongside electricity.

Combined heat and power is a way to make even more efficient use of fuel cells. The waste heat from the electricity production is used to heat water or for space heating.

Combined water and power is similar to CHP, but in this instance the waste heat is used toproduce potable water.

A direct methanol fuel cell functions in a similar way to a PEMFC and uses the same electrolyte, but reforms methanol directly on its electrode to form hydrogen.

The production of electrical power close to the end user.