output from the fuel cell is shut off to conserve fuel, and the ultracapacitor takes over to power air conditioning and other components. A single hydrogen fuel cell delivers a low voltage ...

A key component of hydrogen fuel cell stacks are bipolar plates, which conduct electricity from one cell to the next. The materials for bipolar plates are the subject of intense research and ...

What transit agencies should consider when evaluating battery-electric bus and hydrogen fuel cell bus purchases.