H2 Fuel Cell Technology

A fuel cell uses hydrogen and oxygen to create electricity by an electro-chemical process. A single fuel cell consists of an electrolyte sandwiched between an anode and a cathode. There are different types of fuel cells ? the Proton Exchange Membrane (PEM) fuel cells being used in the CUTE trial operate in the following way:

Hydrogen is fed to the anode where a catalyst separates the negatively-charged electrons in the hydrogen from the positively-charged protons
Protons move through the membrane to the cathode
The electrons from the anode side of the cells cannot pass through the membrane to the positively-charged cathode. They travel via an electrical circuit to reach the other side of the cell. This process produces the electrical current.
At the cathode, oxygen from the air combines with electrons and protons to produce water and heat.
To generate enough power to drive the bus, the many individual fuel cells are connected to each other and built up into "stacks".

H2 Fuel Cell Bus: 2 stacks, 6 rows/stack; 160 cells/row


Fuel Cell Stacks 'in situ' on H 2 Fuel Cell Bus

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