A fuel delivery system (14) includes a drop ejector (30) for discretely ejecting drops of combustible liquid in a digital manner. A controller (76) is configured to cause the drop ejector (30) to provide a first air/fuel mixture to a combustion chamber (17...

A fuel-cell assembly has a plurality of unit cells (20), each of the unit cells comprising an anode (30), an electrolyte (40), a cathode (50), and a current collector (55). The fuel-cell assembly has a plurality of electrical interconnection elements (60, ...

A hydrogen generating apparatus includes a chemical reaction chamber, a chemical solution reservoir, and an unpowered pressure producing member for moving a chemical solution from the chemical solution reservoir to the chemical reaction chamber.

The rate of hydrogen generation in proton-exchange-membrane (PEM) fuel cells (10) is greatly accelerated by mixing a first aqueous alkali borohydride solution with a second aqueous solutionin the presence of one or more transition metal catalysts: NaBH4 + ...