TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The hydrogen is allowed to flow into the buffer by allowing a pressure differential between the cartridge and the buffer to drive the hydrogen into the buffer through a valve. Prior to disconnecting the cartridge, a pressure of hydrogen gas in the buffer is allowed to equalize with a pressure of hydrogen gas in the cartridge. The first pressure is in excess of 400 bar. After connecting the cartridge to the buffer, hydrogen gas is generated within the cartridge by mixing two or more hydrogen precursor materials. A catalyst is provided within the cartridge and facilitates reaction of the two or more hydrogen precursor materials to yield hydrogen gas. The liquid material is provided in a stoichiometric excess. Hydrogen gas is generated within the cartridge by heating a quantity of a hydrogen precursor material in the cartridge to yield hydrogen by thermolysis. The hydrogen is in the form of a cryogenic liquid within the cartridge and the method comprises allowing the hydrogen to vaporize. A pressure of hydrogen within the buffer does not exceed 10 or does not exceed 40 bar when the cartridge is disconnected from the buffer. Hydrogen is allowed to flow from the buffer to the fuel-consuming device by way of a pathway that does not include a pressure regulator. After allowing the hydrogen to flow into the buffer, an amount of the hydrogen in the buffer is limited by the predetermined quantity. After allowing the hydrogen to flow into the buffer, a ratio of a mass of hydrogen remaining in the cartridge to a mass of hydrogen in the buffer does not exceed a ratio of a volume of the cartridge to a volume of the buffer.Preferred Component: The buffer has a volume larger than a volume of the cartridge, the predetermined quantity of hydrogen is initially within the cartridge at a first pressure and a pressure of the hydrogen within the buffer is lower than the first pressure when the cartridge is disconnected from the buffer. The hydrogen precursor materials comprise at least one liquid material.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The liquid material comprises water.